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                 global $wgLegalTitleChars;
 320                 return $wgLegalTitleChars;
 321         }
 322
 323         /**
 324          * Get a string representation of a title suitable for
 325          * including in a search index
 326          *
 327          * @param int $ns a namespace index
 328          * @param string $title text-form main part
 329          * @return string a stripped-down title string ready for the
 330          *      search index
 331          */
 332         /* static */ function indexTitle( $ns, $title ) {
 333                 global $wgDBminWordLen, $wgContLang;
 334                 require_once( 'SearchEngine.php' );
 335
 336                 $lc = SearchEngine::legalSearchChars() . '&#;';
 337                 $t = $wgContLang->stripForSearch( $title );
 338                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 339                 $t = strtolower( $t );
 340
 341                 # Handle 's, s'
 342                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 343                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 344
 345                 $t = preg_replace( "/\\s+/", ' ', $t );
 346
 347                 if ( $ns == NS_IMAGE ) {
 348                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 349                 }
 350                 return trim( $t );
 351         }
 352
 353         /*
 354          * Make a prefixed DB key from a DB key and a namespace index
 355          * @param int $ns numerical representation of the namespace
 356          * @param string $title the DB key form the title
 357          * @return string the prefixed form of the title
 358          */
 359         /* static */ function makeName( $ns, $title ) {
 360                 global $wgContLang;
 361
 362                 $n = $wgContLang->getNsText( $ns );
 363                 return $n == '' ? $title : "$n:$title";
 364         }
 365
 366         /**
 367          * Returns the URL associated with an interwiki prefix
 368          * @param string $key the interwiki prefix (e.g. "MeatBall")
 369          * @return the associated URL, containing "$1", which should be
 370          *      replaced by an article title
 371          * @static (arguably)
 372          * @access public
 373          */
 374         function getInterwikiLink( $key, $transludeonly = false ) {
 375                 global $wgMemc, $wgDBname, $wgInterwikiExpiry, $wgTitleInterwikiCache;
 376                 $fname = 'Title::getInterwikiLink';
 377
 378                 wfProfileIn( $fname );
 379
 380                 $key = strtolower( $key );
 381
 382                 $k = $wgDBname.':interwiki:'.$key;
 383                 if( array_key_exists( $k, $wgTitleInterwikiCache ) ) {
 384                         wfProfileOut( $fname );
 385                         return $wgTitleInterwikiCache[$k]->iw_url;
 386                 }
 387
 388                 $s = $wgMemc->get( $k );
 389                 # Ignore old keys with no iw_local
 390                 if( $s && isset( $s->iw_local ) && isset($s->iw_trans)) {
 391                         $wgTitleInterwikiCache[$k] = $s;
 392                         wfProfileOut( $fname );
 393                         return $s->iw_url;
 394                 }
 395
 396                 $dbr =& wfGetDB( DB_SLAVE );
 397                 $res = $dbr->select( 'interwiki',
 398                         array( 'iw_url', 'iw_local', 'iw_trans' ),
 399                         array( 'iw_prefix' => $key ), $fname );
 400                 if( !$res ) {
 401                         wfProfileOut( $fname );
 402                         return '';
 403                 }
 404
 405                 $s = $dbr->fetchObject( $res );
 406                 if( !$s ) {
 407                         # Cache non-existence: create a blank object and save it to memcached
 408                         $s = (object)false;
 409                         $s->iw_url = '';
 410                         $s->iw_local = 0;
 411                         $s->iw_trans = 0;
 412                 }
 413                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 414                 $wgTitleInterwikiCache[$k] = $s;
 415
 416                 wfProfileOut( $fname );
 417                 return $s->iw_url;
 418         }
 419
 420         /**
 421          * Determine whether the object refers to a page within
 422          * this project.
 423          *
 424          * @return bool TRUE if this is an in-project interwiki link
 425          *      or a wikilink, FALSE otherwise
 426          * @access public
 427          */
 428         function isLocal() {
 429                 global $wgTitleInterwikiCache, $wgDBname;
 430
 431                 if ( $this->mInterwiki != '' ) {
 432                         # Make sure key is loaded into cache
 433                         $this->getInterwikiLink( $this->mInterwiki );
 434                         $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 435                         return (bool)($wgTitleInterwikiCache[$k]->iw_local);
 436                 } else {
 437                         return true;
 438                 }
 439         }
 440
 441         /**
 442          * Determine whether the object refers to a page within
 443          * this project and is transcludable.
 444          *
 445          * @return bool TRUE if this is transcludable
 446          * @access public
 447          */
 448         function isTrans() {
 449                 global $wgTitleInterwikiCache, $wgDBname;
 450
 451                 if ($this->mInterwiki == '' || !$this->isLocal())
 452                         return false;
 453                 # Make sure key is loaded into cache
 454                 $this->getInterwikiLink( $this->mInterwiki );
 455                 $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 456                 return (bool)($wgTitleInterwikiCache[$k]->iw_trans);
 457         }
 458
 459         /**
 460          * Update the page_touched field for an array of title objects
 461          * @todo Inefficient unless the IDs are already loaded into the
 462          *      link cache
 463          * @param array $titles an array of Title objects to be touched
 464          * @param string $timestamp the timestamp to use instead of the
 465          *      default current time
 466          * @static
 467          * @access public
 468          */
 469         function touchArray( $titles, $timestamp = '' ) {
 470                 global $wgUseFileCache;
 471
 472                 if ( count( $titles ) == 0 ) {
 473                         return;
 474                 }
 475                 $dbw =& wfGetDB( DB_MASTER );
 476                 if ( $timestamp == '' ) {
 477                         $timestamp = $dbw->timestamp();
 478                 }
 479                 $page = $dbw->tableName( 'page' );
 480                 /*
 481                 $sql = "UPDATE $page SET page_touched='{$timestamp}' WHERE page_id IN (";
 482                 $first = true;
 483
 484                 foreach ( $titles as $title ) {
 485                         if ( $wgUseFileCache ) {
 486                                 $cm = new CacheManager($title);
 487                                 @unlink($cm->fileCacheName());
 488                         }
 489
 490                         if ( ! $first ) {
 491                                 $sql .= ',';
 492                         }
 493                         $first = false;
 494                         $sql .= $title->getArticleID();
 495                 }
 496                 $sql .= ')';
 497                 if ( ! $first ) {
 498                         $dbw->query( $sql, 'Title::touchArray' );
 499                 }
 500                 */
 501                 // hack hack hack -- brion 2005-07-11. this was unfriendly to db.
 502                 // do them in small chunks:
 503                 $fname = 'Title::touchArray';
 504                 foreach( $titles as $title ) {
 505                         $dbw->update( 'page',
 506                                 array( 'page_touched' => $timestamp ),
 507                                 array(
 508                                         'page_namespace' => $title->getNamespace(),
 509                                         'page_title'     => $title->getDBkey() ),
 510                                 $fname );
 511                 }
 512         }
 513
 514 #----------------------------------------------------------------------------
 515 #       Other stuff
 516 #----------------------------------------------------------------------------
 517
 518         /** Simple accessors */
 519         /**
 520          * Get the text form (spaces not underscores) of the main part
 521          * @return string
 522          * @access public
 523          */
 524         function getText() { return $this->mTextform; }
 525         /**
 526          * Get the URL-encoded form of the main part
 527          * @return string
 528          * @access public
 529          */
 530         function getPartialURL() { return $this->mUrlform; }
 531         /**
 532          * Get the main part with underscores
 533          * @return string
 534          * @access public
 535          */
 536         function getDBkey() { return $this->mDbkeyform; }
 537         /**
 538          * Get the namespace index, i.e. one of the NS_xxxx constants
 539          * @return int
 540          * @access public
 541          */
 542         function getNamespace() { return $this->mNamespace; }
 543         /**
 544          * Get the namespace text
 545          * @return string
 546          * @access public
 547          */
 548         function getNsText() {
 549                 global $wgContLang;
 550                 return $wgContLang->getNsText( $this->mNamespace );
 551         }
 552         /**
 553          * Get the namespace text of the subject (rather than talk) page
 554          * @return string
 555          * @access public
 556          */
 557         function getSubjectNsText() {
 558                 global $wgContLang;
 559                 return $wgContLang->getNsText( Namespace::getSubject( $this->mNamespace ) );
 560         }
 561
 562         /**
 563          * Get the interwiki prefix (or null string)
 564          * @return string
 565          * @access public
 566          */
 567         function getInterwiki() { return $this->mInterwiki; }
 568         /**
 569          * Get the Title fragment (i.e. the bit after the #)
 570          * @return string
 571          * @access public
 572          */
 573         function getFragment() { return $this->mFragment; }
 574         /**
 575          * Get the default namespace index, for when there is no namespace
 576          * @return int
 577          * @access public
 578          */
 579         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 580
 581         /**
 582          * Get title for search index
 583          * @return string a stripped-down title string ready for the
 584          *      search index
 585          */
 586         function getIndexTitle() {
 587                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 588         }
 589
 590         /**
 591          * Get the prefixed database key form
 592          * @return string the prefixed title, with underscores and
 593          *      any interwiki and namespace prefixes
 594          * @access public
 595          */
 596         function getPrefixedDBkey() {
 597                 $s = $this->prefix( $this->mDbkeyform );
 598                 $s = str_replace( ' ', '_', $s );
 599                 return $s;
 600         }
 601
 602         /**
 603          * Get the prefixed title with spaces.
 604          * This is the form usually used for display
 605          * @return string the prefixed title, with spaces
 606          * @access public
 607          */
 608         function getPrefixedText() {
 609                 global $wgContLang;
 610                 if ( empty( $this->mPrefixedText ) ) { // FIXME: bad usage of empty() ?
 611                         $s = $this->prefix( $this->mTextform );
 612                         $s = str_replace( '_', ' ', $s );
 613                         $this->mPrefixedText = $s;
 614                 }
 615                 return $this->mPrefixedText;
 616         }
 617
 618         /**
 619          * Get the prefixed title with spaces, plus any fragment
 620          * (part beginning with '#')
 621          * @return string the prefixed title, with spaces and
 622          *      the fragment, including '#'
 623          * @access public
 624          */
 625         function getFullText() {
 626                 global $wgContLang;
 627                 $text = $this->getPrefixedText();
 628                 if( '' != $this->mFragment ) {
 629                         $text .= '#' . $this->mFragment;
 630                 }
 631                 return $text;
 632         }
 633
 634         /**
 635          * Get a URL-encoded title (not an actual URL) including interwiki
 636          * @return string the URL-encoded form
 637          * @access public
 638          */
 639         function getPrefixedURL() {
 640                 $s = $this->prefix( $this->mDbkeyform );
 641                 $s = str_replace( ' ', '_', $s );
 642
 643                 $s = wfUrlencode ( $s ) ;
 644
 645                 # Cleaning up URL to make it look nice -- is this safe?
 646                 $s = str_replace( '%28', '(', $s );
 647                 $s = str_replace( '%29', ')', $s );
 648
 649                 return $s;
 650         }
 651
 652         /**
 653          * Get a real URL referring to this title, with interwiki link and
 654          * fragment
 655          *
 656          * @param string $query an optional query string, not used
 657          *      for interwiki links
 658          * @return string the URL
 659          * @access public
 660          */
 661         function getFullURL( $query = '' ) {
 662                 global $wgContLang, $wgServer, $wgScript, $wgMakeDumpLinks, $wgArticlePath;
 663
 664                 if ( '' == $this->mInterwiki ) {
 665                         return $wgServer . $this->getLocalUrl( $query );
 666                 } elseif ( $wgMakeDumpLinks && $wgContLang->getLanguageName( $this->mInterwiki ) ) {
 667                         if ( $this->getDBkey() == '' ) {
 668                                 $url = str_replace( '$1', "../{$this->mInterwiki}/index.html", $wgArticlePath );
 669                         } else {
 670                                 $url = str_replace( '$1', "../{$this->mInterwiki}/" . $this->getHashedFilename() ,
 671                                         $wgArticlePath );
 672                         }
 673                         return $url;
 674                 } else {
 675                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 676                 }
 677
 678                 $namespace = $wgContLang->getNsText( $this->mNamespace );
 679                 if ( '' != $namespace ) {
 680                         # Can this actually happen? Interwikis shouldn't be parsed.
 681                         $namespace .= ':';
 682                 }
 683                 $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 684                 if( $query != '' ) {
 685                         if( false === strpos( $url, '?' ) ) {
 686                                 $url .= '?';
 687                         } else {
 688                                 $url .= '&';
 689                         }
 690                         $url .= $query;
 691                 }
 692                 if ( '' != $this->mFragment ) {
 693                         $url .= '#' . $this->mFragment;
 694                 }
 695                 return $url;
 696         }
 697
 698         /**
 699          * Get a relative directory for putting an HTML version of this article into
 700          */
 701         function getHashedDirectory() {
 702                 global $wgMakeDumpLinks, $wgInputEncoding;
 703                 if ( '' != $this->mInterwiki ) {
 704                         $pdbk = $this->mDbkeyform;
 705                 } else {
 706                         $pdbk = $this->getPrefixedDBkey();
 707                 }
 708
 709                 # Split into characters
 710                 if ( $wgInputEncoding == 'UTF-8' ) {
 711                         preg_match_all( '/./us', $pdbk, $m );
 712                 } else {
 713                         preg_match_all( '/./s', $pdbk, $m );
 714                 }
 715                 $chars = $m[0];
 716                 $length = count( $chars );
 717                 $dir = '';
 718
 719                 for ( $i = 0; $i < $wgMakeDumpLinks; $i++ ) {
 720                         $c = $chars[$i];
 721                         if ( $i ) {
 722                                 $dir .= '/';
 723                         }
 724                         if ( $i >= $length ) {
 725                                 $dir .= '_';
 726                         } elseif ( ord( $c ) >= 128 || ctype_alnum( $c ) ) {
 727                                 $dir .= strtolower( $c );
 728                         } else {
 729                                 $dir .= sprintf( "%02X", ord( $c ) );
 730                         }
 731                 }
 732                 return $dir;
 733         }
 734
 735         function getHashedFilename() {
 736                 if ( '' != $this->mInterwiki ) {
 737                         $dbkey = $this->getDBkey();
 738                 } else {
 739                         $dbkey = $this->getPrefixedDBkey();
 740                 }
 741
 742                 $mainPage = Title::newMainPage();
 743                 if ( $mainPage->getPrefixedDBkey() == $dbkey ) {
 744                         return 'index.html';
 745                 }
 746
 747                 $dir = $this->getHashedDirectory();
 748
 749                 # Replace illegal charcters for Windows paths with underscores
 750                 $friendlyName = strtr( $dbkey, '/\\*?"<>|~', '_________' );
 751
 752                 # Work out lower case form. We assume we're on a system with case-insensitive
 753                 # filenames, so unless the case is of a special form, we have to disambiguate
 754                 $lowerCase = ucfirst( strtolower( $dbkey ) );
 755
 756                 # Make it mostly unique
 757                 if ( $lowerCase != $friendlyName  ) {
 758                         $friendlyName .= '_' . substr(md5( $dbkey ), 0, 4);
 759                 }
 760                 # Handle colon specially by replacing it with tilde
 761                 # Thus we reduce the number of paths with hashes appended
 762                 $friendlyName = str_replace( ':', '~', $friendlyName );
 763                 return "$dir/$friendlyName.html";
 764         }
 765
 766         /**
 767          * Get a URL with no fragment or server name.  If this page is generated
 768          * with action=render, $wgServer is prepended.
 769          * @param string $query an optional query string; if not specified,
 770          *      $wgArticlePath will be used.
 771          * @return string the URL
 772          * @access public
 773          */
 774         function getLocalURL( $query = '' ) {
 775                 global $wgLang, $wgArticlePath, $wgScript, $wgMakeDumpLinks, $wgServer, $action;
 776
 777                 if ( $this->isExternal() ) {
 778                         return $this->getFullURL();
 779                 }
 780
 781                 $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 782                 if ( $wgMakeDumpLinks ) {
 783                         $url = str_replace( '$1', wfUrlencode( $this->getHashedFilename() ), $wgArticlePath );
 784                 } elseif ( $query == '' ) {
 785                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 786                 } else {
 787                         global $wgActionPaths;
 788                         if( !empty( $wgActionPaths ) &&
 789                                 preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) ) {
 790                                 $action = urldecode( $matches[2] );
 791                                 if( isset( $wgActionPaths[$action] ) ) {
 792                                         $query = $matches[1];
 793                                         if( isset( $matches[4] ) ) $query .= $matches[4];
 794                                         $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 795                                         if( $query != '' ) $url .= '?' . $query;
 796                                         return $url;
 797                                 }
 798                         }
 799                         if ( $query == '-' ) {
 800                                 $query = '';
 801                         }
 802                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 803                 }
 804
 805                 if ($action == 'render')
 806                         return $wgServer . $url;
 807                 else
 808                         return $url;
 809         }
 810
 811         /**
 812          * Get an HTML-escaped version of the URL form, suitable for
 813          * using in a link, without a server name or fragment
 814          * @param string $query an optional query string
 815          * @return string the URL
 816          * @access public
 817          */
 818         function escapeLocalURL( $query = '' ) {
 819                 return htmlspecialchars( $this->getLocalURL( $query ) );
 820         }
 821
 822         /**
 823          * Get an HTML-escaped version of the URL form, suitable for
 824          * using in a link, including the server name and fragment
 825          *
 826          * @return string the URL
 827          * @param string $query an optional query string
 828          * @access public
 829          */
 830         function escapeFullURL( $query = '' ) {
 831                 return htmlspecialchars( $this->getFullURL( $query ) );
 832         }
 833
 834         /**
 835          * Get the URL form for an internal link.
 836          * - Used in various Squid-related code, in case we have a different
 837          * internal hostname for the server from the exposed one.
 838          *
 839          * @param string $query an optional query string
 840          * @return string the URL
 841          * @access public
 842          */
 843         function getInternalURL( $query = '' ) {
 844                 global $wgInternalServer;
 845                 return $wgInternalServer . $this->getLocalURL( $query );
 846         }
 847
 848         /**
 849          * Get the edit URL for this Title
 850          * @return string the URL, or a null string if this is an
 851          *      interwiki link
 852          * @access public
 853          */
 854         function getEditURL() {
 855                 global $wgServer, $wgScript;
 856
 857                 if ( '' != $this->mInterwiki ) { return ''; }
 858                 $s = $this->getLocalURL( 'action=edit' );
 859
 860                 return $s;
 861         }
 862
 863         /**
 864          * Get the HTML-escaped displayable text form.
 865          * Used for the title field in <a> tags.
 866          * @return string the text, including any prefixes
 867          * @access public
 868          */
 869         function getEscapedText() {
 870                 return htmlspecialchars( $this->getPrefixedText() );
 871         }
 872
 873         /**
 874          * Is this Title interwiki?
 875          * @return boolean
 876          * @access public
 877          */
 878         function isExternal() { return ( '' != $this->mInterwiki ); }
 879
 880         /**
 881          * Does the title correspond to a protected article?
 882          * @param string $what the action the page is protected from,
 883          *      by default checks move and edit
 884          * @return boolean
 885          * @access public
 886          */
 887         function isProtected($action = '') {
 888                 if ( -1 == $this->mNamespace ) { return true; }
 889                 if($action == 'edit' || $action == '') {
 890                         $a = $this->getRestrictions("edit");
 891                         if ( in_array( 'sysop', $a ) ) { return true; }
 892                 }
 893                 if($action == 'move' || $action == '') {
 894                         $a = $this->getRestrictions("move");
 895                         if ( in_array( 'sysop', $a ) ) { return true; }
 896                 }
 897                 return false;
 898         }
 899
 900         /**
 901          * Is $wgUser is watching this page?
 902          * @return boolean
 903          * @access public
 904          */
 905         function userIsWatching() {
 906                 global $wgUser;
 907
 908                 if ( is_null( $this->mWatched ) ) {
 909                         if ( -1 == $this->mNamespace || 0 == $wgUser->getID()) {
 910                                 $this->mWatched = false;
 911                         } else {
 912                                 $this->mWatched = $wgUser->isWatched( $this );
 913                         }
 914                 }
 915                 return $this->mWatched;
 916         }
 917
 918         /**
 919          * Can $wgUser perform $action this page?
 920          * @param string $action action that permission needs to be checked for
 921          * @return boolean
 922          * @access private
 923          */
 924         function userCan($action) {
 925                 $fname = 'Title::userCan';
 926                 wfProfileIn( $fname );
 927
 928                 global $wgUser;
 929                 if( NS_SPECIAL == $this->mNamespace ) {
 930                         wfProfileOut( $fname );
 931                         return false;
 932                 }
 933                 // XXX: This is the code that prevents unprotecting a page in NS_MEDIAWIKI
 934                 // from taking effect -ævar
 935                 if( NS_MEDIAWIKI == $this->mNamespace &&
 936                     !$wgUser->isAllowed('editinterface') ) {
 937                         wfProfileOut( $fname );
 938                         return false;
 939                 }
 940
 941                 if( $this->mDbkeyform == '_' ) {
 942                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
 943                         wfProfileOut( $fname );
 944                         return false;
 945                 }
 946
 947                 # protect global styles and js
 948                 if ( NS_MEDIAWIKI == $this->mNamespace
 949                  && preg_match("/\\.(css|js)$/", $this->mTextform )
 950                      && !$wgUser->isAllowed('editinterface') ) {
 951                         wfProfileOut( $fname );
 952                         return false;
 953                 }
 954
 955                 # protect css/js subpages of user pages
 956                 # XXX: this might be better using restrictions
 957                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
 958                 if( NS_USER == $this->mNamespace
 959                         && preg_match("/\\.(css|js)$/", $this->mTextform )
 960                         && !$wgUser->isAllowed('editinterface')
 961                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
 962                         wfProfileOut( $fname );
 963                         return false;
 964                 }
 965
 966                 foreach( $this->getRestrictions($action) as $right ) {
 967                         // Backwards compatibility, rewrite sysop -> protect
 968                         if ( $right == 'sysop' ) {
 969                                 $right = 'protect';
 970                         }
 971                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
 972                                 wfProfileOut( $fname );
 973                                 return false;
 974                         }
 975                 }
 976
 977                 if( $action == 'move' &&
 978                         !( $this->isMovable() && $wgUser->isAllowed( 'move' ) ) ) {
 979                         wfProfileOut( $fname );
 980                         return false;
 981                 }
 982
 983                 wfProfileOut( $fname );
 984                 return true;
 985         }
 986
 987         /**
 988          * Can $wgUser edit this page?
 989          * @return boolean
 990          * @access public
 991          */
 992         function userCanEdit() {
 993                 return $this->userCan('edit');
 994         }
 995
 996         /**
 997          * Can $wgUser move this page?
 998          * @return boolean
 999          * @access public
1000          */
1001         function userCanMove() {
1002                 return $this->userCan('move');
1003         }
1004
1005         /**
1006          * Would anybody with sufficient privileges be able to move this page?
1007          * Some pages just aren't movable.
1008          *
1009          * @return boolean
1010          * @access public
1011          */
1012         function isMovable() {
1013                 return Namespace::isMovable( $this->getNamespace() )
1014                         && $this->getInterwiki() == '';
1015         }
1016
1017         /**
1018          * Can $wgUser read this page?
1019          * @return boolean
1020          * @access public
1021          */
1022         function userCanRead() {
1023                 global $wgUser;
1024
1025                 if( $wgUser->isAllowed('read') ) {
1026                         return true;
1027                 } else {
1028                         global $wgWhitelistRead;
1029
1030                         /** If anon users can create an account,
1031                             they need to reach the login page first! */
1032                         if( $wgUser->isAllowed( 'createaccount' )
1033                             && $this->getNamespace() == NS_SPECIAL
1034                             && $this->getText() == 'Userlogin' ) {
1035                                 return true;
1036                         }
1037
1038                         /** some pages are explicitly allowed */
1039                         $name = $this->getPrefixedText();
1040                         if( $wgWhitelistRead && in_array( $name, $wgWhitelistRead ) ) {
1041                                 return true;
1042                         }
1043
1044                         # Compatibility with old settings
1045                         if( $wgWhitelistRead && $this->getNamespace() == NS_MAIN ) {
1046                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
1047                                         return true;
1048                                 }
1049                         }
1050                 }
1051                 return false;
1052         }
1053
1054         /**
1055          * Is this a talk page of some sort?
1056          * @return bool
1057          * @access public
1058          */
1059         function isTalkPage() {
1060                 return Namespace::isTalk( $this->getNamespace() );
1061         }
1062
1063         /**
1064          * Is this a .css or .js subpage of a user page?
1065          * @return bool
1066          * @access public
1067          */
1068         function isCssJsSubpage() {
1069                 return ( NS_USER == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
1070         }
1071         /**
1072          * Is this a .css subpage of a user page?
1073          * @return bool
1074          * @access public
1075          */
1076         function isCssSubpage() {
1077                 return ( NS_USER == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
1078         }
1079         /**
1080          * Is this a .js subpage of a user page?
1081          * @return bool
1082          * @access public
1083          */
1084         function isJsSubpage() {
1085                 return ( NS_USER == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
1086         }
1087         /**
1088          * Protect css/js subpages of user pages: can $wgUser edit
1089          * this page?
1090          *
1091          * @return boolean
1092          * @todo XXX: this might be better using restrictions
1093          * @access public
1094          */
1095         function userCanEditCssJsSubpage() {
1096                 global $wgUser;
1097                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1098         }
1099
1100         /**
1101          * Loads a string into mRestrictions array
1102          * @param string $res restrictions in string format
1103          * @access public
1104          */
1105         function loadRestrictions( $res ) {
1106                 foreach( explode( ':', trim( $res ) ) as $restrict ) {
1107                         $temp = explode( '=', trim( $restrict ) );
1108                         if(count($temp) == 1) {
1109                                 // old format should be treated as edit/move restriction
1110                                 $this->mRestrictions["edit"] = explode( ',', trim( $temp[0] ) );
1111                                 $this->mRestrictions["move"] = explode( ',', trim( $temp[0] ) );
1112                         } else {
1113                                 $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1114                         }
1115                 }
1116                 $this->mRestrictionsLoaded = true;
1117         }
1118
1119         /**
1120          * Accessor/initialisation for mRestrictions
1121          * @param string $action action that permission needs to be checked for
1122          * @return array the array of groups allowed to edit this article
1123          * @access public
1124          */
1125         function getRestrictions($action) {
1126                 $id = $this->getArticleID();
1127                 if ( 0 == $id ) { return array(); }
1128
1129                 if ( ! $this->mRestrictionsLoaded ) {
1130                         $dbr =& wfGetDB( DB_SLAVE );
1131                         $res = $dbr->selectField( 'page', 'page_restrictions', 'page_id='.$id );
1132                         $this->loadRestrictions( $res );
1133                 }
1134                 if( isset( $this->mRestrictions[$action] ) ) {
1135                         return $this->mRestrictions[$action];
1136                 }
1137                 return array();
1138         }
1139
1140         /**
1141          * Is there a version of this page in the deletion archive?
1142          * @return int the number of archived revisions
1143          * @access public
1144          */
1145         function isDeleted() {
1146                 $fname = 'Title::isDeleted';
1147                 if ( $this->getNamespace() < 0 ) {
1148                         $n = 0;
1149                 } else {
1150                         $dbr =& wfGetDB( DB_SLAVE );
1151                         $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1152                                 'ar_title' => $this->getDBkey() ), $fname );
1153                 }
1154                 return (int)$n;
1155         }
1156
1157         /**
1158          * Get the article ID for this Title from the link cache,
1159          * adding it if necessary
1160          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1161          *      for update
1162          * @return int the ID
1163          * @access public
1164          */
1165         function getArticleID( $flags = 0 ) {
1166                 global $wgLinkCache;
1167                 if ( $flags & GAID_FOR_UPDATE ) {
1168                         $oldUpdate = $wgLinkCache->forUpdate( true );
1169                         $this->mArticleID = $wgLinkCache->addLinkObj( $this );
1170                         $wgLinkCache->forUpdate( $oldUpdate );
1171                 } else {
1172                         if ( -1 == $this->mArticleID ) {
1173                                 $this->mArticleID = $wgLinkCache->addLinkObj( $this );
1174                         }
1175                 }
1176                 return $this->mArticleID;
1177         }
1178
1179         function getLatestRevID() {
1180                 if ($this->mLatestID !== false)
1181                         return $this->mLatestID;
1182
1183                 $db =& wfGetDB(DB_SLAVE);
1184                 return $this->mLatestID = $db->selectField( 'revision',
1185                         "max(rev_id)",
1186                         array('rev_page' => $this->getArticleID()),
1187                         'Title::getLatestRevID' );
1188         }
1189
1190         /**
1191          * This clears some fields in this object, and clears any associated
1192          * keys in the "bad links" section of $wgLinkCache.
1193          *
1194          * - This is called from Article::insertNewArticle() to allow
1195          * loading of the new page_id. It's also called from
1196          * Article::doDeleteArticle()
1197          *
1198          * @param int $newid the new Article ID
1199          * @access public
1200          */
1201         function resetArticleID( $newid ) {
1202                 global $wgLinkCache;
1203                 $wgLinkCache->clearBadLink( $this->getPrefixedDBkey() );
1204
1205                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1206                 else { $this->mArticleID = $newid; }
1207                 $this->mRestrictionsLoaded = false;
1208                 $this->mRestrictions = array();
1209         }
1210
1211         /**
1212          * Updates page_touched for this page; called from LinksUpdate.php
1213          * @return bool true if the update succeded
1214          * @access public
1215          */
1216         function invalidateCache() {
1217                 global $wgUseFileCache;
1218
1219                 if ( wfReadOnly() ) {
1220                         return;
1221                 }
1222
1223                 $now = wfTimestampNow();
1224                 $dbw =& wfGetDB( DB_MASTER );
1225                 $success = $dbw->update( 'page',
1226                         array( /* SET */
1227                                 'page_touched' => $dbw->timestamp()
1228                         ), array( /* WHERE */
1229                                 'page_namespace' => $this->getNamespace() ,
1230                                 'page_title' => $this->getDBkey()
1231                         ), 'Title::invalidateCache'
1232                 );
1233
1234                 if ($wgUseFileCache) {
1235                         $cache = new CacheManager($this);
1236                         @unlink($cache->fileCacheName());
1237                 }
1238
1239                 return $success;
1240         }
1241
1242         /**
1243          * Prefix some arbitrary text with the namespace or interwiki prefix
1244          * of this object
1245          *
1246          * @param string $name the text
1247          * @return string the prefixed text
1248          * @access private
1249          */
1250         /* private */ function prefix( $name ) {
1251                 global $wgContLang;
1252
1253                 $p = '';
1254                 if ( '' != $this->mInterwiki ) {
1255                         $p = $this->mInterwiki . ':';
1256                 }
1257                 if ( 0 != $this->mNamespace ) {
1258                         $p .= $wgContLang->getNsText( $this->mNamespace ) . ':';
1259                 }
1260                 return $p . $name;
1261         }
1262
1263         /**
1264          * Secure and split - main initialisation function for this object
1265          *
1266          * Assumes that mDbkeyform has been set, and is urldecoded
1267          * and uses underscores, but not otherwise munged.  This function
1268          * removes illegal characters, splits off the interwiki and
1269          * namespace prefixes, sets the other forms, and canonicalizes
1270          * everything.
1271          * @return bool true on success
1272          * @access private
1273          */
1274         /* private */ function secureAndSplit() {
1275                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1276                 $fname = 'Title::secureAndSplit';
1277                 wfProfileIn( $fname );
1278
1279                 # Initialisation
1280                 static $rxTc = false;
1281                 if( !$rxTc ) {
1282                         # % is needed as well
1283                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/S';
1284                 }
1285
1286                 $this->mInterwiki = $this->mFragment = '';
1287                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1288
1289                 # Clean up whitespace
1290                 #
1291                 $t = preg_replace( '/[ _]+/', '_', $this->mDbkeyform );
1292                 $t = trim( $t, '_' );
1293
1294                 if ( '' == $t ) {
1295                         wfProfileOut( $fname );
1296                         return false;
1297                 }
1298
1299                 if( false !== strpos( $t, UTF8_REPLACEMENT ) ) {
1300                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1301                         wfProfileOut( $fname );
1302                         return false;
1303                 }
1304
1305                 $this->mDbkeyform = $t;
1306
1307                 # Initial colon indicates main namespace rather than specified default
1308                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
1309                 if ( ':' == $t{0} ) {
1310                         $this->mNamespace = NS_MAIN;
1311                         $t = substr( $t, 1 ); # remove the colon but continue processing
1312                 }
1313
1314                 # Namespace or interwiki prefix
1315                 $firstPass = true;
1316                 do {
1317                         if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $t, $m ) ) {
1318                                 $p = $m[1];
1319                                 $lowerNs = strtolower( $p );
1320                                 if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1321                                         # Canonical namespace
1322                                         $t = $m[2];
1323                                         $this->mNamespace = $ns;
1324                                 } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1325                                         # Ordinary namespace
1326                                         $t = $m[2];
1327                                         $this->mNamespace = $ns;
1328                                 } elseif( $this->getInterwikiLink( $p ) ) {
1329                                         if( !$firstPass ) {
1330                                                 # Can't make a local interwiki link to an interwiki link.
1331                                                 # That's just crazy!
1332                                                 wfProfileOut( $fname );
1333                                                 return false;
1334                                         }
1335
1336                                         # Interwiki link
1337                                         $t = $m[2];
1338                                         $this->mInterwiki = strtolower( $p );
1339
1340                                         # Redundant interwiki prefix to the local wiki
1341                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1342                                                 if( $t == '' ) {
1343                                                         # Can't have an empty self-link
1344                                                         wfProfileOut( $fname );
1345                                                         return false;
1346                                                 }
1347                                                 $this->mInterwiki = '';
1348                                                 $firstPass = false;
1349                                                 # Do another namespace split...
1350                                                 continue;
1351                                         }
1352                                 }
1353                                 # If there's no recognized interwiki or namespace,
1354                                 # then let the colon expression be part of the title.
1355                         }
1356                         break;
1357                 } while( true );
1358                 $r = $t;
1359
1360                 # We already know that some pages won't be in the database!
1361                 #
1362                 if ( '' != $this->mInterwiki || -1 == $this->mNamespace ) {
1363                         $this->mArticleID = 0;
1364                 }
1365                 $f = strstr( $r, '#' );
1366                 if ( false !== $f ) {
1367                         $this->mFragment = substr( $f, 1 );
1368                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
1369                         # remove whitespace again: prevents "Foo_bar_#"
1370                         # becoming "Foo_bar_"
1371                         $r = preg_replace( '/_*$/', '', $r );
1372                 }
1373
1374                 # Reject illegal characters.
1375                 #
1376                 if( preg_match( $rxTc, $r ) ) {
1377                         wfProfileOut( $fname );
1378                         return false;
1379                 }
1380
1381                 /**
1382                  * Pages with "/./" or "/../" appearing in the URLs will
1383                  * often be unreachable due to the way web browsers deal
1384                  * with 'relative' URLs. Forbid them explicitly.
1385                  */
1386                 if ( strpos( $r, '.' ) !== false &&
1387                      ( $r === '.' || $r === '..' ||
1388                        strpos( $r, './' ) === 0  ||
1389                        strpos( $r, '../' ) === 0 ||
1390                        strpos( $r, '/./' ) !== false ||
1391                        strpos( $r, '/../' ) !== false ) )
1392                 {
1393                         wfProfileOut( $fname );
1394                         return false;
1395                 }
1396
1397                 # We shouldn't need to query the DB for the size.
1398                 #$maxSize = $dbr->textFieldSize( 'page', 'page_title' );
1399                 if ( strlen( $r ) > 255 ) {
1400                         wfProfileOut( $fname );
1401                         return false;
1402                 }
1403
1404                 /**
1405                  * Normally, all wiki links are forced to have
1406                  * an initial capital letter so [[foo]] and [[Foo]]
1407                  * point to the same place.
1408                  *
1409                  * Don't force it for interwikis, since the other
1410                  * site might be case-sensitive.
1411                  */
1412                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1413                         $t = $wgContLang->ucfirst( $r );
1414                 } else {
1415                         $t = $r;
1416                 }
1417
1418                 /**
1419                  * Can't make a link to a namespace alone...
1420                  * "empty" local links can only be self-links
1421                  * with a fragment identifier.
1422                  */
1423                 if( $t == '' &&
1424                         $this->mInterwiki == '' &&
1425                         $this->mNamespace != NS_MAIN ) {
1426                         wfProfileOut( $fname );
1427                         return false;
1428                 }
1429
1430                 # Fill fields
1431                 $this->mDbkeyform = $t;
1432                 $this->mUrlform = wfUrlencode( $t );
1433
1434                 $this->mTextform = str_replace( '_', ' ', $t );
1435
1436                 wfProfileOut( $fname );
1437                 return true;
1438         }
1439
1440         /**
1441          * Get a Title object associated with the talk page of this article
1442          * @return Title the object for the talk page
1443          * @access public
1444          */
1445         function getTalkPage() {
1446                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1447         }
1448
1449         /**
1450          * Get a title object associated with the subject page of this
1451          * talk page
1452          *
1453          * @return Title the object for the subject page
1454          * @access public
1455          */
1456         function getSubjectPage() {
1457                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1458         }
1459
1460         /**
1461          * Get an array of Title objects linking to this Title
1462          * Also stores the IDs in the link cache.
1463          *
1464          * @param string $options may be FOR UPDATE
1465          * @return array the Title objects linking here
1466          * @access public
1467          */
1468         function getLinksTo( $options = '' ) {
1469                 global $wgLinkCache;
1470                 $id = $this->getArticleID();
1471
1472                 if ( $options ) {
1473                         $db =& wfGetDB( DB_MASTER );
1474                 } else {
1475                         $db =& wfGetDB( DB_SLAVE );
1476                 }
1477
1478                 $res = $db->select( array( 'page', 'pagelinks' ),
1479                         array( 'page_namespace', 'page_title', 'page_id' ),
1480                         array(
1481                                 'pl_from=page_id',
1482                                 'pl_namespace' => $this->getNamespace(),
1483                                 'pl_title'     => $this->getDbKey() ),
1484                         'Title::getLinksTo',
1485                         $options );
1486
1487                 $retVal = array();
1488                 if ( $db->numRows( $res ) ) {
1489                         while ( $row = $db->fetchObject( $res ) ) {
1490                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1491                                         $wgLinkCache->addGoodLinkObj( $row->page_id, $titleObj );
1492                                         $retVal[] = $titleObj;
1493                                 }
1494                         }
1495                 }
1496                 $db->freeResult( $res );
1497                 return $retVal;
1498         }
1499
1500         /**
1501          * Get an array of Title objects referring to non-existent articles linked from this page
1502          *
1503          * @param string $options may be FOR UPDATE
1504          * @return array the Title objects
1505          * @access public
1506          */
1507         function getBrokenLinksFrom( $options = '' ) {
1508                 global $wgLinkCache;
1509
1510                 if ( $options ) {
1511                         $db =& wfGetDB( DB_MASTER );
1512                 } else {
1513                         $db =& wfGetDB( DB_SLAVE );
1514                 }
1515
1516                 $res = $db->safeQuery(
1517                           "SELECT pl_namespace, pl_title
1518                              FROM !
1519                         LEFT JOIN !
1520                                ON pl_namespace=page_namespace
1521                               AND pl_title=page_title
1522                             WHERE pl_from=?
1523                               AND page_namespace IS NULL
1524                                   !",
1525                         $db->tableName( 'pagelinks' ),
1526                         $db->tableName( 'page' ),
1527                         $this->getArticleId(),
1528                         $options );
1529
1530                 $retVal = array();
1531                 if ( $db->numRows( $res ) ) {
1532                         while ( $row = $db->fetchObject( $res ) ) {
1533                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
1534                         }
1535                 }
1536                 $db->freeResult( $res );
1537                 return $retVal;
1538         }
1539
1540
1541         /**
1542          * Get a list of URLs to purge from the Squid cache when this
1543          * page changes
1544          *
1545          * @return array the URLs
1546          * @access public
1547          */
1548         function getSquidURLs() {
1549                 return array(
1550                         $this->getInternalURL(),
1551                         $this->getInternalURL( 'action=history' )
1552                 );
1553         }
1554
1555         /**
1556          * Move this page without authentication
1557          * @param Title &$nt the new page Title
1558          * @access public
1559          */
1560         function moveNoAuth( &$nt ) {
1561                 return $this->moveTo( $nt, false );
1562         }
1563
1564         /**
1565          * Check whether a given move operation would be valid.
1566          * Returns true if ok, or a message key string for an error message
1567          * if invalid. (Scarrrrry ugly interface this.)
1568          * @param Title &$nt the new title
1569          * @param bool $auth indicates whether $wgUser's permissions
1570          *      should be checked
1571          * @return mixed true on success, message name on failure
1572          * @access public
1573          */
1574         function isValidMoveOperation( &$nt, $auth = true, $reason = '' ) {
1575                 global $wgUser;
1576                 if( !$this or !$nt ) {
1577                         return 'badtitletext';
1578                 }
1579                 if( $this->equals( $nt ) ) {
1580                         return 'selfmove';
1581                 }
1582                 if( !$this->isMovable() || !$nt->isMovable() ) {
1583                         return 'immobile_namespace';
1584                 }
1585
1586                 $fname = 'Title::move';
1587                 $oldid = $this->getArticleID();
1588                 $newid = $nt->getArticleID();
1589
1590                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1591                         return 'articleexists';
1592                 }
1593                 if ( ( '' == $this->getDBkey() ) ||
1594                          ( !$oldid ) ||
1595                      ( '' == $nt->getDBkey() ) ) {
1596                         return 'badarticleerror';
1597                 }
1598
1599                 if ( $auth && (
1600                                 !$this->userCanEdit() || !$nt->userCanEdit() ||
1601                                 !$this->userCanMove() || !$nt->userCanMove() ) ) {
1602                         return 'protectedpage';
1603                 }
1604
1605                 # The move is allowed only if (1) the target doesn't exist, or
1606                 # (2) the target is a redirect to the source, and has no history
1607                 # (so we can undo bad moves right after they're done).
1608
1609                 if ( 0 != $newid ) { # Target exists; check for validity
1610                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1611                                 return 'articleexists';
1612                         }
1613                 }
1614                 return true;
1615         }
1616
1617         /**
1618          * Move a title to a new location
1619          * @param Title &$nt the new title
1620          * @param bool $auth indicates whether $wgUser's permissions
1621          *      should be checked
1622          * @return mixed true on success, message name on failure
1623          * @access public
1624          */
1625         function moveTo( &$nt, $auth = true, $reason = '' ) {
1626                 $err = $this->isValidMoveOperation( $nt, $auth, $reason );
1627                 if( is_string( $err ) ) {
1628                         return $err;
1629                 }
1630
1631                 $pageid = $this->getArticleID();
1632                 if( $nt->exists() ) {
1633                         $this->moveOverExistingRedirect( $nt, $reason );
1634                         $pageCountChange = 0;
1635                 } else { # Target didn't exist, do normal move.
1636                         $this->moveToNewTitle( $nt, $newid, $reason );
1637                         $pageCountChange = 1;
1638                 }
1639                 $redirid = $this->getArticleID();
1640
1641                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
1642                 $dbw =& wfGetDB( DB_MASTER );
1643                 $categorylinks = $dbw->tableName( 'categorylinks' );
1644                 $sql = "UPDATE $categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
1645                         " WHERE cl_from=" . $dbw->addQuotes( $pageid ) .
1646                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
1647                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
1648
1649                 # Update watchlists
1650
1651                 $oldnamespace = $this->getNamespace() & ~1;
1652                 $newnamespace = $nt->getNamespace() & ~1;
1653                 $oldtitle = $this->getDBkey();
1654                 $newtitle = $nt->getDBkey();
1655
1656                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
1657                         WatchedItem::duplicateEntries( $this, $nt );
1658                 }
1659
1660                 # Update search engine
1661                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
1662                 $u->doUpdate();
1663                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
1664                 $u->doUpdate();
1665
1666                 # Update site_stats
1667                 if ( $this->getNamespace() == NS_MAIN and $nt->getNamespace() != NS_MAIN ) {
1668                         # Moved out of main namespace
1669                         # not viewed, edited, removing
1670                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange);
1671                 } elseif ( $this->getNamespace() != NS_MAIN and $nt->getNamespace() == NS_MAIN ) {
1672                         # Moved into main namespace
1673                         # not viewed, edited, adding
1674                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
1675                 } elseif ( $pageCountChange ) {
1676                         # Added redirect
1677                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
1678                 } else{
1679                         $u = false;
1680                 }
1681                 if ( $u ) {
1682                         $u->doUpdate();
1683                 }
1684
1685                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
1686                 return true;
1687         }
1688
1689         /**
1690          * Move page to a title which is at present a redirect to the
1691          * source page
1692          *
1693          * @param Title &$nt the page to move to, which should currently
1694          *      be a redirect
1695          * @access private
1696          */
1697         function moveOverExistingRedirect( &$nt, $reason = '' ) {
1698                 global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
1699                 $fname = 'Title::moveOverExistingRedirect';
1700                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1701
1702                 if ( $reason ) {
1703                         $comment .= ": $reason";
1704                 }
1705
1706                 $now = wfTimestampNow();
1707                 $rand = wfRandom();
1708                 $newid = $nt->getArticleID();
1709                 $oldid = $this->getArticleID();
1710                 $dbw =& wfGetDB( DB_MASTER );
1711                 $links = $dbw->tableName( 'links' );
1712
1713                 # Delete the old redirect. We don't save it to history since
1714                 # by definition if we've got here it's rather uninteresting.
1715                 # We have to remove it so that the next step doesn't trigger
1716                 # a conflict on the unique namespace+title index...
1717                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
1718
1719                 # Save a null revision in the page's history notifying of the move
1720                 $nullRevision = Revision::newNullRevision( $dbw, $oldid,
1721                         wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() ),
1722                         true );
1723                 $nullRevId = $nullRevision->insertOn( $dbw );
1724
1725                 # Change the name of the target page:
1726                 $dbw->update( 'page',
1727                         /* SET */ array(
1728                                 'page_touched'   => $dbw->timestamp($now),
1729                                 'page_namespace' => $nt->getNamespace(),
1730                                 'page_title'     => $nt->getDBkey(),
1731                                 'page_latest'    => $nullRevId,
1732                         ),
1733                         /* WHERE */ array( 'page_id' => $oldid ),
1734                         $fname
1735                 );
1736                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1737
1738                 # Recreate the redirect, this time in the other direction.
1739                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1740                 $redirectArticle = new Article( $this );
1741                 $newid = $redirectArticle->insertOn( $dbw );
1742                 $redirectRevision = new Revision( array(
1743                         'page'    => $newid,
1744                         'comment' => $comment,
1745                         'text'    => $redirectText ) );
1746                 $revid = $redirectRevision->insertOn( $dbw );
1747                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1748                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1749
1750                 # Log the move
1751                 $log = new LogPage( 'move' );
1752                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
1753
1754                 # Now, we record the link from the redirect to the new title.
1755                 # It should have no other outgoing links...
1756                 $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
1757                 $dbw->insert( 'pagelinks',
1758                         array(
1759                                 'pl_from'      => $newid,
1760                                 'pl_namespace' => $nt->getNamespace(),
1761                                 'pl_title'     => $nt->getDbKey() ),
1762                         $fname );
1763
1764                 # Purge squid
1765                 if ( $wgUseSquid ) {
1766                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1767                         $u = new SquidUpdate( $urls );
1768                         $u->doUpdate();
1769                 }
1770         }
1771
1772         /**
1773          * Move page to non-existing title.
1774          * @param Title &$nt the new Title
1775          * @param int &$newid set to be the new article ID
1776          * @access private
1777          */
1778         function moveToNewTitle( &$nt, &$newid, $reason = '' ) {
1779                 global $wgUser, $wgLinkCache, $wgUseSquid;
1780                 global $wgMwRedir;
1781                 $fname = 'MovePageForm::moveToNewTitle';
1782                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1783                 if ( $reason ) {
1784                         $comment .= ": $reason";
1785                 }
1786
1787                 $newid = $nt->getArticleID();
1788                 $oldid = $this->getArticleID();
1789                 $dbw =& wfGetDB( DB_MASTER );
1790                 $now = $dbw->timestamp();
1791                 wfSeedRandom();
1792                 $rand = wfRandom();
1793
1794                 # Save a null revision in the page's history notifying of the move
1795                 $nullRevision = Revision::newNullRevision( $dbw, $oldid,
1796                         wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() ),
1797                         true );
1798                 $nullRevId = $nullRevision->insertOn( $dbw );
1799
1800                 # Rename cur entry
1801                 $dbw->update( 'page',
1802                         /* SET */ array(
1803                                 'page_touched'   => $now,
1804                                 'page_namespace' => $nt->getNamespace(),
1805                                 'page_title'     => $nt->getDBkey(),
1806                                 'page_latest'    => $nullRevId,
1807                         ),
1808                         /* WHERE */ array( 'page_id' => $oldid ),
1809                         $fname
1810                 );
1811
1812                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1813
1814                 # Insert redirect
1815                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1816                 $redirectArticle = new Article( $this );
1817                 $newid = $redirectArticle->insertOn( $dbw );
1818                 $redirectRevision = new Revision( array(
1819                         'page'    => $newid,
1820                         'comment' => $comment,
1821                         'text'    => $redirectText ) );
1822                 $revid = $redirectRevision->insertOn( $dbw );
1823                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1824                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1825
1826                 # Log the move
1827                 $log = new LogPage( 'move' );
1828                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
1829
1830                 # Purge caches as per article creation
1831                 Article::onArticleCreate( $nt );
1832
1833                 # Record the just-created redirect's linking to the page
1834                 $dbw->insert( 'pagelinks',
1835                         array(
1836                                 'pl_from'      => $newid,
1837                                 'pl_namespace' => $nt->getNamespace(),
1838                                 'pl_title'     => $nt->getDBkey() ),
1839                         $fname );
1840
1841                 # Non-existent target may have had broken links to it; these must
1842                 # now be touched to update link coloring.
1843                 $nt->touchLinks();
1844
1845                 # Purge old title from squid
1846                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1847                 $titles = $nt->getLinksTo();
1848                 if ( $wgUseSquid ) {
1849                         $urls = $this->getSquidURLs();
1850                         foreach ( $titles as $linkTitle ) {
1851                                 $urls[] = $linkTitle->getInternalURL();
1852                         }
1853                         $u = new SquidUpdate( $urls );
1854                         $u->doUpdate();
1855                 }
1856         }
1857
1858         /**
1859          * Checks if $this can be moved to a given Title
1860          * - Selects for update, so don't call it unless you mean business
1861          *
1862          * @param Title &$nt the new title to check
1863          * @access public
1864          */
1865         function isValidMoveTarget( $nt ) {
1866
1867                 $fname = 'Title::isValidMoveTarget';
1868                 $dbw =& wfGetDB( DB_MASTER );
1869
1870                 # Is it a redirect?
1871                 $id  = $nt->getArticleID();
1872                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
1873                         array( 'page_is_redirect','old_text','old_flags' ),
1874                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
1875                         $fname, 'FOR UPDATE' );
1876
1877                 if ( !$obj || 0 == $obj->page_is_redirect ) {
1878                         # Not a redirect
1879                         return false;
1880                 }
1881                 $text = Revision::getRevisionText( $obj );
1882
1883                 # Does the redirect point to the source?
1884                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
1885                         $redirTitle = Title::newFromText( $m[1] );
1886                         if( !is_object( $redirTitle ) ||
1887                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1888                                 return false;
1889                         }
1890                 } else {
1891                         # Fail safe
1892                         return false;
1893                 }
1894
1895                 # Does the article have a history?
1896                 $row = $dbw->selectRow( array( 'page', 'revision'),
1897                         array( 'rev_id' ),
1898                         array( 'page_namespace' => $nt->getNamespace(),
1899                                 'page_title' => $nt->getDBkey(),
1900                                 'page_id=rev_page AND page_latest != rev_id'
1901                         ), $fname, 'FOR UPDATE'
1902                 );
1903
1904                 # Return true if there was no history
1905                 return $row === false;
1906         }
1907
1908         /**
1909          * Create a redirect; fails if the title already exists; does
1910          * not notify RC
1911          *
1912          * @param Title $dest the destination of the redirect
1913          * @param string $comment the comment string describing the move
1914          * @return bool true on success
1915          * @access public
1916          */
1917         function createRedirect( $dest, $comment ) {
1918                 global $wgUser;
1919                 if ( $this->getArticleID() ) {
1920                         return false;
1921                 }
1922
1923                 $fname = 'Title::createRedirect';
1924                 $dbw =& wfGetDB( DB_MASTER );
1925
1926                 $article = new Article( $this );
1927                 $newid = $article->insertOn( $dbw );
1928                 $revision = new Revision( array(
1929                         'page'      => $newid,
1930                         'comment'   => $comment,
1931                         'text'      => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n",
1932                         ) );
1933                 $revisionId = $revision->insertOn( $dbw );
1934                 $article->updateRevisionOn( $dbw, $revision, 0 );
1935
1936                 # Link table
1937                 $dbw->insert( 'pagelinks',
1938                         array(
1939                                 'pl_from'      => $newid,
1940                                 'pl_namespace' => $dest->getNamespace(),
1941                                 'pl_title'     => $dest->getDbKey()
1942                         ), $fname
1943                 );
1944
1945                 Article::onArticleCreate( $this );
1946                 return true;
1947         }
1948
1949         /**
1950          * Get categories to which this Title belongs and return an array of
1951          * categories' names.
1952          *
1953          * @return array an array of parents in the form:
1954          *      $parent => $currentarticle
1955          * @access public
1956          */
1957         function getParentCategories() {
1958                 global $wgContLang,$wgUser;
1959
1960                 $titlekey = $this->getArticleId();
1961                 $sk =& $wgUser->getSkin();
1962                 $parents = array();
1963                 $dbr =& wfGetDB( DB_SLAVE );
1964                 $categorylinks = $dbr->tableName( 'categorylinks' );
1965
1966                 # NEW SQL
1967                 $sql = "SELECT * FROM $categorylinks"
1968                      ." WHERE cl_from='$titlekey'"
1969                          ." AND cl_from <> '0'"
1970                          ." ORDER BY cl_sortkey";
1971
1972                 $res = $dbr->query ( $sql ) ;
1973
1974                 if($dbr->numRows($res) > 0) {
1975                         while ( $x = $dbr->fetchObject ( $res ) )
1976                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
1977                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
1978                         $dbr->freeResult ( $res ) ;
1979                 } else {
1980                         $data = '';
1981                 }
1982                 return $data;
1983         }
1984
1985         /**
1986          * Get a tree of parent categories
1987          * @param array $children an array with the children in the keys, to check for circular refs
1988          * @return array
1989          * @access public
1990          */
1991         function getParentCategoryTree( $children = array() ) {
1992                 $parents = $this->getParentCategories();
1993
1994                 if($parents != '') {
1995                         foreach($parents as $parent => $current)
1996                         {
1997                                 if ( array_key_exists( $parent, $children ) ) {
1998                                         # Circular reference
1999                                         $stack[$parent] = array();
2000                                 } else {
2001                                         $nt = Title::newFromText($parent);
2002                                         $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
2003                                 }
2004                         }
2005                         return $stack;
2006                 } else {
2007                         return array();
2008                 }
2009         }
2010
2011
2012         /**
2013          * Get an associative array for selecting this title from
2014          * the "cur" table
2015          *
2016          * @return array
2017          * @access public
2018          */
2019         function curCond() {
2020                 wfDebugDieBacktrace( 'curCond called' );
2021                 return array( 'cur_namespace' => $this->mNamespace, 'cur_title' => $this->mDbkeyform );
2022         }
2023
2024         /**
2025          * Get an associative array for selecting this title from the
2026          * "old" table
2027          *
2028          * @return array
2029          * @access public
2030          */
2031         function oldCond() {
2032                 wfDebugDieBacktrace( 'oldCond called' );
2033                 return array( 'old_namespace' => $this->mNamespace, 'old_title' => $this->mDbkeyform );
2034         }
2035
2036         /**
2037          * Get the revision ID of the previous revision
2038          *
2039          * @param integer $revision  Revision ID. Get the revision that was before this one.
2040          * @return interger $oldrevision|false
2041          */
2042         function getPreviousRevisionID( $revision ) {
2043                 $dbr =& wfGetDB( DB_SLAVE );
2044                 return $dbr->selectField( 'revision', 'rev_id',
2045                         'rev_page=' . intval( $this->getArticleId() ) .
2046                         ' AND rev_id<' . intval( $revision ) . ' ORDER BY rev_id DESC' );
2047         }
2048
2049         /**
2050          * Get the revision ID of the next revision
2051          *
2052          * @param integer $revision  Revision ID. Get the revision that was after this one.
2053          * @return interger $oldrevision|false
2054          */
2055         function getNextRevisionID( $revision ) {
2056                 $dbr =& wfGetDB( DB_SLAVE );
2057                 return $dbr->selectField( 'revision', 'rev_id',
2058                         'rev_page=' . intval( $this->getArticleId() ) .
2059                         ' AND rev_id>' . intval( $revision ) . ' ORDER BY rev_id' );
2060         }
2061
2062         /**
2063          * Compare with another title.
2064          *
2065          * @param Title $title
2066          * @return bool
2067          */
2068         function equals( &$title ) {
2069                 return $this->getInterwiki() == $title->getInterwiki()
2070                         && $this->getNamespace() == $title->getNamespace()
2071                         && $this->getDbkey() == $title->getDbkey();
2072         }
2073
2074         /**
2075          * Check if page exists
2076          * @return bool
2077          */
2078         function exists() {
2079                 return $this->getArticleId() != 0;
2080         }
2081
2082         /**
2083          * Should a link should be displayed as a known link, just based on its title?
2084          *
2085          * Currently, a self-link with a fragment, special pages and image pages are in
2086          * this category. Special pages never exist in the database. Some images do not
2087          * have description pages in the database, but the description page contains
2088          * useful history information that the user may want to link to.
2089          */
2090         function isAlwaysKnown() {
2091                 return  $this->isExternal() || ( 0 == $this->mNamespace && "" == $this->mDbkeyform )
2092                   || NS_SPECIAL == $this->mNamespace || NS_IMAGE == $this->mNamespace;
2093         }
2094
2095         /**
2096          * Update page_touched timestamps on pages linking to this title.
2097          * In principal, this could be backgrounded and could also do squid
2098          * purging.
2099          */
2100         function touchLinks() {
2101                 $fname = 'Title::touchLinks';
2102
2103                 $dbw =& wfGetDB( DB_MASTER );
2104
2105                 $res = $dbw->select( 'pagelinks',
2106                         array( 'pl_from' ),
2107                         array(
2108                                 'pl_namespace' => $this->getNamespace(),
2109                                 'pl_title'     => $this->getDbKey() ),
2110                         $fname );
2111                 if ( 0 == $dbw->numRows( $res ) ) {
2112                         return;
2113                 }
2114
2115                 $arr = array();
2116                 $toucharr = array();
2117                 while( $row = $dbw->fetchObject( $res ) ) {
2118                         $toucharr[] = $row->pl_from;
2119                 }
2120                 if (!count($toucharr))
2121                         return;
2122                 $dbw->update( 'page', /* SET */ array( 'page_touched' => $dbw->timestamp() ),
2123                                                         /* WHERE */ array( 'page_id' => $toucharr ),$fname);
2124         }
2125
2126         function trackbackURL() {
2127                 global $wgTitle, $wgScriptPath, $wgServer;
2128
2129                 return "$wgServer$wgScriptPath/trackback.php?article="
2130                         . htmlspecialchars(urlencode($wgTitle->getPrefixedDBkey()));
2131         }
2132
2133         function trackbackRDF() {
2134                 $url = htmlspecialchars($this->getFullURL());
2135                 $title = htmlspecialchars($this->getText());
2136                 $tburl = $this->trackbackURL();
2137
2138                 return "
2139 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
2140          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
2141          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
2142 <rdf:Description
2143    rdf:about=\"$url\"
2144    dc:identifier=\"$url\"
2145    dc:title=\"$title\"
2146    trackback:ping=\"$tburl\" />
2147 </rdf:RDF>";
2148         }
2149 }
2150 ?>