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