includes/Title.php

   1 <?php
   2 /**
   3  * See title.txt
   4  *
   5  * @package MediaWiki
   6  */
   7
   8 /** */
   9 require_once( 'normal/UtfNormal.php' );
  10
  11 $wgTitleInterwikiCache = array();
  12 define ( 'GAID_FOR_UPDATE', 1 );
  13
  14 # Title::newFromTitle maintains a cache to avoid
  15 # expensive re-normalization of commonly used titles.
  16 # On a batch operation this can become a memory leak
  17 # if not bounded. After hitting this many titles,
  18 # reset the cache.
  19 define( 'MW_TITLECACHE_MAX', 1000 );
  20
  21 /**
  22  * Title class
  23  * - Represents a title, which may contain an interwiki designation or namespace
  24  * - Can fetch various kinds of data from the database, albeit inefficiently.
  25  *
  26  * @package MediaWiki
  27  */
  28 class Title {
  29         /**
  30          * All member variables should be considered private
  31          * Please use the accessor functions
  32          */
  33
  34          /**#@+
  35          * @access private
  36          */
  37
  38         var $mTextform;           # Text form (spaces not underscores) of the main part
  39         var $mUrlform;            # URL-encoded form of the main part
  40         var $mDbkeyform;          # Main part with underscores
  41         var $mNamespace;          # Namespace index, i.e. one of the NS_xxxx constants
  42         var $mInterwiki;          # Interwiki prefix (or null string)
  43         var $mFragment;           # Title fragment (i.e. the bit after the #)
  44         var $mArticleID;          # Article ID, fetched from the link cache on demand
  45         var $mLatestID;         # ID of most recent revision
  46         var $mRestrictions;       # Array of groups allowed to edit this article
  47                               # Only null or "sysop" are supported
  48         var $mRestrictionsLoaded; # Boolean for initialisation on demand
  49         var $mPrefixedText;       # Text form including namespace/interwiki, initialised on demand
  50         var $mDefaultNamespace;   # Namespace index when there is no namespace
  51                               # Zero except in {{transclusion}} tags
  52         var $mWatched;            # Is $wgUser watching this page? NULL if unfilled, accessed through userIsWatching()
  53         /**#@-*/
  54
  55
  56         /**
  57          * Constructor
  58          * @access private
  59          */
  60         /* private */ function Title() {
  61                 $this->mInterwiki = $this->mUrlform =
  62                 $this->mTextform = $this->mDbkeyform = '';
  63                 $this->mArticleID = -1;
  64                 $this->mNamespace = NS_MAIN;
  65                 $this->mRestrictionsLoaded = false;
  66                 $this->mRestrictions = array();
  67                 # Dont change the following, NS_MAIN is hardcoded in several place
  68                 # See bug #696
  69                 $this->mDefaultNamespace = NS_MAIN;
  70                 $this->mWatched = NULL;
  71                 $this->mLatestID = false;
  72         }
  73
  74         /**
  75          * Create a new Title from a prefixed DB key
  76          * @param string $key The database key, which has underscores
  77          *      instead of spaces, possibly including namespace and
  78          *      interwiki prefixes
  79          * @return Title the new object, or NULL on an error
  80          * @static
  81          * @access public
  82          */
  83         /* static */ function newFromDBkey( $key ) {
  84                 $t = new Title();
  85                 $t->mDbkeyform = $key;
  86                 if( $t->secureAndSplit() )
  87                         return $t;
  88                 else
  89                         return NULL;
  90         }
  91
  92         /**
  93          * Create a new Title from text, such as what one would
  94          * find in a link. Decodes any HTML entities in the text.
  95          *
  96          * @param string $text the link text; spaces, prefixes,
  97          *      and an initial ':' indicating the main namespace
  98          *      are accepted
  99          * @param int $defaultNamespace the namespace to use if
 100          *      none is specified by a prefix
 101          * @return Title the new object, or NULL on an error
 102          * @static
 103          * @access public
 104          */
 105         function newFromText( $text, $defaultNamespace = NS_MAIN ) {
 106                 $fname = 'Title::newFromText';
 107                 wfProfileIn( $fname );
 108
 109                 if( is_object( $text ) ) {
 110                         wfDebugDieBacktrace( 'Title::newFromText given an object' );
 111                 }
 112
 113                 /**
 114                  * Wiki pages often contain multiple links to the same page.
 115                  * Title normalization and parsing can become expensive on
 116                  * pages with many links, so we can save a little time by
 117                  * caching them.
 118                  *
 119                  * In theory these are value objects and won't get changed...
 120                  */
 121                 static $titleCache = array();
 122                 if( $defaultNamespace == NS_MAIN && isset( $titleCache[$text] ) ) {
 123                         wfProfileOut( $fname );
 124                         return $titleCache[$text];
 125                 }
 126
 127                 /**
 128                  * Convert things like &eacute; &#257; or &#x3017; into real text...
 129                  */
 130                 $filteredText = Sanitizer::decodeCharReferences( $text );
 131
 132                 $t =& new Title();
 133                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 134                 $t->mDefaultNamespace = $defaultNamespace;
 135
 136                 if( $t->secureAndSplit() ) {
 137                         if( $defaultNamespace == NS_MAIN ) {
 138                                 if( count( $titleCache ) >= MW_TITLECACHE_MAX ) {
 139                                         # Avoid memory leaks on mass operations...
 140                                         $titleCache = array();
 141                                 }
 142                                 $titleCache[$text] =& $t;
 143                         }
 144                         wfProfileOut( $fname );
 145                         return $t;
 146                 } else {
 147                         wfProfileOut( $fname );
 148                         $ret = NULL;
 149                         return $ret;
 150                 }
 151         }
 152
 153         /**
 154          * Create a new Title from URL-encoded text. Ensures that
 155          * the given title's length does not exceed the maximum.
 156          * @param string $url the title, as might be taken from a URL
 157          * @return Title the new object, or NULL on an error
 158          * @static
 159          * @access public
 160          */
 161         function newFromURL( $url ) {
 162                 global $wgLang, $wgServer;
 163                 $t = new Title();
 164
 165                 # For compatibility with old buggy URLs. "+" is not valid in titles,
 166                 # but some URLs used it as a space replacement and they still come
 167                 # from some external search tools.
 168                 $s = str_replace( '+', ' ', $url );
 169
 170                 $t->mDbkeyform = str_replace( ' ', '_', $s );
 171                 if( $t->secureAndSplit() ) {
 172                         return $t;
 173                 } else {
 174                         return NULL;
 175                 }
 176         }
 177
 178         /**
 179          * Create a new Title from an article ID
 180          *
 181          * @todo This is inefficiently implemented, the page row is requested
 182          *       but not used for anything else
 183          *
 184          * @param int $id the page_id corresponding to the Title to create
 185          * @return Title the new object, or NULL on an error
 186          * @access public
 187          * @static
 188          */
 189         function newFromID( $id ) {
 190                 $fname = 'Title::newFromID';
 191                 $dbr =& wfGetDB( DB_SLAVE );
 192                 $row = $dbr->selectRow( 'page', array( 'page_namespace', 'page_title' ),
 193                         array( 'page_id' => $id ), $fname );
 194                 if ( $row !== false ) {
 195                         $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 196                 } else {
 197                         $title = NULL;
 198                 }
 199                 return $title;
 200         }
 201
 202         /**
 203          * Create a new Title from a namespace index and a DB key.
 204          * It's assumed that $ns and $title are *valid*, for instance when
 205          * they came directly from the database or a special page name.
 206          * For convenience, spaces are converted to underscores so that
 207          * eg user_text fields can be used directly.
 208          *
 209          * @param int $ns the namespace of the article
 210          * @param string $title the unprefixed database key form
 211          * @return Title the new object
 212          * @static
 213          * @access public
 214          */
 215         function &makeTitle( $ns, $title ) {
 216                 $t =& new Title();
 217                 $t->mInterwiki = '';
 218                 $t->mFragment = '';
 219                 $t->mNamespace = intval( $ns );
 220                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 221                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 222                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 223                 $t->mTextform = str_replace( '_', ' ', $title );
 224                 return $t;
 225         }
 226
 227         /**
 228          * Create a new Title frrom a namespace index and a DB key.
 229          * The parameters will be checked for validity, which is a bit slower
 230          * than makeTitle() but safer for user-provided data.
 231          *
 232          * @param int $ns the namespace of the article
 233          * @param string $title the database key form
 234          * @return Title the new object, or NULL on an error
 235          * @static
 236          * @access public
 237          */
 238         function makeTitleSafe( $ns, $title ) {
 239                 $t = new Title();
 240                 $t->mDbkeyform = Title::makeName( $ns, $title );
 241                 if( $t->secureAndSplit() ) {
 242                         return $t;
 243                 } else {
 244                         return NULL;
 245                 }
 246         }
 247
 248         /**
 249          * Create a new Title for the Main Page
 250          *
 251          * @static
 252          * @return Title the new object
 253          * @access public
 254          */
 255         function newMainPage() {
 256                 return Title::newFromText( wfMsgForContent( 'mainpage' ) );
 257         }
 258
 259         /**
 260          * Create a new Title for a redirect
 261          * @param string $text the redirect title text
 262          * @return Title the new object, or NULL if the text is not a
 263          *      valid redirect
 264          * @static
 265          * @access public
 266          */
 267         function newFromRedirect( $text ) {
 268                 global $wgMwRedir;
 269                 $rt = NULL;
 270                 if ( $wgMwRedir->matchStart( $text ) ) {
 271                         if ( preg_match( '/\[{2}(.*?)(?:\||\]{2})/', $text, $m ) ) {
 272                                 # categories are escaped using : for example one can enter:
 273                                 # #REDIRECT [[:Category:Music]]. Need to remove it.
 274                                 if ( substr($m[1],0,1) == ':') {
 275                                         # We don't want to keep the ':'
 276                                         $m[1] = substr( $m[1], 1 );
 277                                 }
 278
 279                                 $rt = Title::newFromText( $m[1] );
 280                                 # Disallow redirects to Special:Userlogout
 281                                 if ( !is_null($rt) && $rt->getNamespace() == NS_SPECIAL && preg_match( '/^Userlogout/i', $rt->getText() ) ) {
 282                                         $rt = NULL;
 283                                 }
 284                         }
 285                 }
 286                 return $rt;
 287         }
 288
 289 #----------------------------------------------------------------------------
 290 #       Static functions
 291 #----------------------------------------------------------------------------
 292
 293         /**
 294          * Get the prefixed DB key associated with an ID
 295          * @param int $id the page_id of the article
 296          * @return Title an object representing the article, or NULL
 297          *      if no such article was found
 298          * @static
 299          * @access public
 300          */
 301         function nameOf( $id ) {
 302                 $fname = 'Title::nameOf';
 303                 $dbr =& wfGetDB( DB_SLAVE );
 304
 305                 $s = $dbr->selectRow( 'page', array( 'page_namespace','page_title' ),  array( 'page_id' => $id ), $fname );
 306                 if ( $s === false ) { return NULL; }
 307
 308                 $n = Title::makeName( $s->page_namespace, $s->page_title );
 309                 return $n;
 310         }
 311
 312         /**
 313          * Get a regex character class describing the legal characters in a link
 314          * @return string the list of characters, not delimited
 315          * @static
 316          * @access public
 317          */
 318         function legalChars() {
 319                 # Missing characters:
 320                 #  * []|# Needed for link syntax
 321                 #  * % and + are corrupted by Apache when they appear in the path
 322                 #
 323                 # % seems to work though
 324                 #
 325                 # The problem with % is that URLs are double-unescaped: once by Apache's
 326                 # path conversion code, and again by PHP. So %253F, for example, becomes "?".
 327                 # Our code does not double-escape to compensate for this, indeed double escaping
 328                 # would break if the double-escaped title was passed in the query string
 329                 # rather than the path. This is a minor security issue because articles can be
 330                 # created such that they are hard to view or edit. -- TS
 331                 #
 332                 # Theoretically 0x80-0x9F of ISO 8859-1 should be disallowed, but
 333                 # this breaks interlanguage links
 334
 335                 $set = " %!\"$&'()*,\\-.\\/0-9:;=?@A-Z\\\\^_`a-z~\\x80-\\xFF";
 336                 return $set;
 337         }
 338
 339         /**
 340          * Get a string representation of a title suitable for
 341          * including in a search index
 342          *
 343          * @param int $ns a namespace index
 344          * @param string $title text-form main part
 345          * @return string a stripped-down title string ready for the
 346          *      search index
 347          */
 348         /* static */ function indexTitle( $ns, $title ) {
 349                 global $wgDBminWordLen, $wgContLang;
 350                 require_once( 'SearchEngine.php' );
 351
 352                 $lc = SearchEngine::legalSearchChars() . '&#;';
 353                 $t = $wgContLang->stripForSearch( $title );
 354                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 355                 $t = strtolower( $t );
 356
 357                 # Handle 's, s'
 358                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 359                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 360
 361                 $t = preg_replace( "/\\s+/", ' ', $t );
 362
 363                 if ( $ns == NS_IMAGE ) {
 364                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 365                 }
 366                 return trim( $t );
 367         }
 368
 369         /*
 370          * Make a prefixed DB key from a DB key and a namespace index
 371          * @param int $ns numerical representation of the namespace
 372          * @param string $title the DB key form the title
 373          * @return string the prefixed form of the title
 374          */
 375         /* static */ function makeName( $ns, $title ) {
 376                 global $wgContLang;
 377
 378                 $n = $wgContLang->getNsText( $ns );
 379                 return $n == '' ? $title : "$n:$title";
 380         }
 381
 382         /**
 383          * Returns the URL associated with an interwiki prefix
 384          * @param string $key the interwiki prefix (e.g. "MeatBall")
 385          * @return the associated URL, containing "$1", which should be
 386          *      replaced by an article title
 387          * @static (arguably)
 388          * @access public
 389          */
 390         function getInterwikiLink( $key, $transludeonly = false ) {
 391                 global $wgMemc, $wgDBname, $wgInterwikiExpiry, $wgTitleInterwikiCache;
 392                 $fname = 'Title::getInterwikiLink';
 393
 394                 wfProfileIn( $fname );
 395
 396                 $k = $wgDBname.':interwiki:'.$key;
 397                 if( array_key_exists( $k, $wgTitleInterwikiCache ) ) {
 398                         wfProfileOut( $fname );
 399                         return $wgTitleInterwikiCache[$k]->iw_url;
 400                 }
 401
 402                 $s = $wgMemc->get( $k );
 403                 # Ignore old keys with no iw_local
 404                 if( $s && isset( $s->iw_local ) && isset($s->iw_trans)) {
 405                         $wgTitleInterwikiCache[$k] = $s;
 406                         wfProfileOut( $fname );
 407                         return $s->iw_url;
 408                 }
 409
 410                 $dbr =& wfGetDB( DB_SLAVE );
 411                 $res = $dbr->select( 'interwiki',
 412                         array( 'iw_url', 'iw_local', 'iw_trans' ),
 413                         array( 'iw_prefix' => $key ), $fname );
 414                 if( !$res ) {
 415                         wfProfileOut( $fname );
 416                         return '';
 417                 }
 418
 419                 $s = $dbr->fetchObject( $res );
 420                 if( !$s ) {
 421                         # Cache non-existence: create a blank object and save it to memcached
 422                         $s = (object)false;
 423                         $s->iw_url = '';
 424                         $s->iw_local = 0;
 425                         $s->iw_trans = 0;
 426                 }
 427                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 428                 $wgTitleInterwikiCache[$k] = $s;
 429
 430                 wfProfileOut( $fname );
 431                 return $s->iw_url;
 432         }
 433
 434         /**
 435          * Determine whether the object refers to a page within
 436          * this project.
 437          *
 438          * @return bool TRUE if this is an in-project interwiki link
 439          *      or a wikilink, FALSE otherwise
 440          * @access public
 441          */
 442         function isLocal() {
 443                 global $wgTitleInterwikiCache, $wgDBname;
 444
 445                 if ( $this->mInterwiki != '' ) {
 446                         # Make sure key is loaded into cache
 447                         $this->getInterwikiLink( $this->mInterwiki );
 448                         $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 449                         return (bool)($wgTitleInterwikiCache[$k]->iw_local);
 450                 } else {
 451                         return true;
 452                 }
 453         }
 454
 455         /**
 456          * Determine whether the object refers to a page within
 457          * this project and is transcludable.
 458          *
 459          * @return bool TRUE if this is transcludable
 460          * @access public
 461          */
 462         function isTrans() {
 463                 global $wgTitleInterwikiCache, $wgDBname;
 464
 465                 if ($this->mInterwiki == '' || !$this->isLocal())
 466                         return false;
 467                 # Make sure key is loaded into cache
 468                 $this->getInterwikiLink( $this->mInterwiki );
 469                 $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 470                 return (bool)($wgTitleInterwikiCache[$k]->iw_trans);
 471         }
 472
 473         /**
 474          * Update the page_touched field for an array of title objects
 475          * @todo Inefficient unless the IDs are already loaded into the
 476          *      link cache
 477          * @param array $titles an array of Title objects to be touched
 478          * @param string $timestamp the timestamp to use instead of the
 479          *      default current time
 480          * @static
 481          * @access public
 482          */
 483         function touchArray( $titles, $timestamp = '' ) {
 484                 global $wgUseFileCache;
 485
 486                 if ( count( $titles ) == 0 ) {
 487                         return;
 488                 }
 489                 $dbw =& wfGetDB( DB_MASTER );
 490                 if ( $timestamp == '' ) {
 491                         $timestamp = $dbw->timestamp();
 492                 }
 493                 $page = $dbw->tableName( 'page' );
 494                 /*
 495                 $sql = "UPDATE $page SET page_touched='{$timestamp}' WHERE page_id IN (";
 496                 $first = true;
 497
 498                 foreach ( $titles as $title ) {
 499                         if ( $wgUseFileCache ) {
 500                                 $cm = new CacheManager($title);
 501                                 @unlink($cm->fileCacheName());
 502                         }
 503
 504                         if ( ! $first ) {
 505                                 $sql .= ',';
 506                         }
 507                         $first = false;
 508                         $sql .= $title->getArticleID();
 509                 }
 510                 $sql .= ')';
 511                 if ( ! $first ) {
 512                         $dbw->query( $sql, 'Title::touchArray' );
 513                 }
 514                 */
 515                 // hack hack hack -- brion 2005-07-11. this was unfriendly to db.
 516                 // do them in small chunks:
 517                 $fname = 'Title::touchArray';
 518                 foreach( $titles as $title ) {
 519                         $dbw->update( 'page',
 520                                 array( 'page_touched' => $timestamp ),
 521                                 array(
 522                                         'page_namespace' => $title->getNamespace(),
 523                                         'page_title'     => $title->getDBkey() ),
 524                                 $fname );
 525                 }
 526         }
 527
 528 #----------------------------------------------------------------------------
 529 #       Other stuff
 530 #----------------------------------------------------------------------------
 531
 532         /** Simple accessors */
 533         /**
 534          * Get the text form (spaces not underscores) of the main part
 535          * @return string
 536          * @access public
 537          */
 538         function getText() { return $this->mTextform; }
 539         /**
 540          * Get the URL-encoded form of the main part
 541          * @return string
 542          * @access public
 543          */
 544         function getPartialURL() { return $this->mUrlform; }
 545         /**
 546          * Get the main part with underscores
 547          * @return string
 548          * @access public
 549          */
 550         function getDBkey() { return $this->mDbkeyform; }
 551         /**
 552          * Get the namespace index, i.e. one of the NS_xxxx constants
 553          * @return int
 554          * @access public
 555          */
 556         function getNamespace() { return $this->mNamespace; }
 557         /**
 558          * Get the namespace text
 559          * @return string
 560          * @access public
 561          */
 562         function getNsText() {
 563                 global $wgLang;
 564                 return $wgLang->getNsText( $this->mNamespace );
 565         }
 566         /**
 567          * Get the interwiki prefix (or null string)
 568          * @return string
 569          * @access public
 570          */
 571         function getInterwiki() { return $this->mInterwiki; }
 572         /**
 573          * Get the Title fragment (i.e. the bit after the #)
 574          * @return string
 575          * @access public
 576          */
 577         function getFragment() { return $this->mFragment; }
 578         /**
 579          * Get the default namespace index, for when there is no namespace
 580          * @return int
 581          * @access public
 582          */
 583         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 584
 585         /**
 586          * Get title for search index
 587          * @return string a stripped-down title string ready for the
 588          *      search index
 589          */
 590         function getIndexTitle() {
 591                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 592         }
 593
 594         /**
 595          * Get the prefixed database key form
 596          * @return string the prefixed title, with underscores and
 597          *      any interwiki and namespace prefixes
 598          * @access public
 599          */
 600         function getPrefixedDBkey() {
 601                 $s = $this->prefix( $this->mDbkeyform );
 602                 $s = str_replace( ' ', '_', $s );
 603                 return $s;
 604         }
 605
 606         /**
 607          * Get the prefixed title with spaces.
 608          * This is the form usually used for display
 609          * @return string the prefixed title, with spaces
 610          * @access public
 611          */
 612         function getPrefixedText() {
 613                 global $wgContLang;
 614                 if ( empty( $this->mPrefixedText ) ) {
 615                         $s = $this->prefix( $this->mTextform );
 616                         $s = str_replace( '_', ' ', $s );
 617                         $this->mPrefixedText = $s;
 618                 }
 619                 return $this->mPrefixedText;
 620         }
 621
 622         /**
 623          * Get the prefixed title with spaces, plus any fragment
 624          * (part beginning with '#')
 625          * @return string the prefixed title, with spaces and
 626          *      the fragment, including '#'
 627          * @access public
 628          */
 629         function getFullText() {
 630                 global $wgContLang;
 631                 $text = $this->getPrefixedText();
 632                 if( '' != $this->mFragment ) {
 633                         $text .= '#' . $this->mFragment;
 634                 }
 635                 return $text;
 636         }
 637
 638         /**
 639          * Get a URL-encoded title (not an actual URL) including interwiki
 640          * @return string the URL-encoded form
 641          * @access public
 642          */
 643         function getPrefixedURL() {
 644                 $s = $this->prefix( $this->mDbkeyform );
 645                 $s = str_replace( ' ', '_', $s );
 646
 647                 $s = wfUrlencode ( $s ) ;
 648
 649                 # Cleaning up URL to make it look nice -- is this safe?
 650                 $s = str_replace( '%28', '(', $s );
 651                 $s = str_replace( '%29', ')', $s );
 652
 653                 return $s;
 654         }
 655
 656         /**
 657          * Get a real URL referring to this title, with interwiki link and
 658          * fragment
 659          *
 660          * @param string $query an optional query string, not used
 661          *      for interwiki links
 662          * @return string the URL
 663          * @access public
 664          */
 665         function getFullURL( $query = '' ) {
 666                 global $wgContLang, $wgServer, $wgScript, $wgMakeDumpLinks, $wgArticlePath;
 667
 668                 if ( '' == $this->mInterwiki ) {
 669                         return $wgServer . $this->getLocalUrl( $query );
 670                 } elseif ( $wgMakeDumpLinks && $wgContLang->getLanguageName( $this->mInterwiki ) ) {
 671                         $baseUrl = str_replace( '$1', "../../{$this->mInterwiki}/$1", $wgArticlePath );
 672                         $baseUrl = str_replace( '$1', $this->getHashedDirectory() . '/$1', $baseUrl );
 673                 } else {
 674                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 675                 }
 676
 677                 $namespace = $wgContLang->getNsText( $this->mNamespace );
 678                 if ( '' != $namespace ) {
 679                         # Can this actually happen? Interwikis shouldn't be parsed.
 680                         $namespace .= ':';
 681                 }
 682                 $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 683                 if( $query != '' ) {
 684                         if( false === strpos( $url, '?' ) ) {
 685                                 $url .= '?';
 686                         } else {
 687                                 $url .= '&';
 688                         }
 689                         $url .= $query;
 690                 }
 691                 if ( '' != $this->mFragment ) {
 692                         $url .= '#' . $this->mFragment;
 693                 }
 694                 return $url;
 695         }
 696
 697         /**
 698          * Get a relative directory for putting an HTML version of this article into
 699          */
 700         function getHashedDirectory() {
 701                 global $wgMakeDumpLinks, $wgInputEncoding;
 702                 $dbkey = $this->getDBkey();
 703
 704                 # Split into characters
 705                 if ( $wgInputEncoding == 'UTF-8' ) {
 706                         preg_match_all( '/./us', $dbkey, $m );
 707                 } else {
 708                         preg_match_all( '/./s', $dbkey, $m );
 709                 }
 710                 $chars = $m[0];
 711                 $length = count( $chars );
 712                 $dir = '';
 713
 714                 for ( $i = 0; $i < $wgMakeDumpLinks; $i++ ) {
 715                         if ( $i ) {
 716                                 $dir .= '/';
 717                         }
 718                         if ( $i >= $length ) {
 719                                 $dir .= '_';
 720                         } elseif ( ord( $chars[$i] ) > 32 ) {
 721                                 $dir .= strtolower( $chars[$i] );
 722                         } else {
 723                                 $dir .= sprintf( "%02X", ord( $chars[$i] ) );
 724                         }
 725                 }
 726                 return $dir;
 727         }
 728
 729         function getHashedFilename() {
 730                 $dbkey = $this->getPrefixedDBkey();
 731                 $mainPage = Title::newMainPage();
 732                 if ( $mainPage->getPrefixedDBkey() == $dbkey ) {
 733                         return 'index.html';
 734                 }
 735
 736                 $dir = $this->getHashedDirectory();
 737
 738                 # Replace illegal charcters for Windows paths with underscores
 739                 $friendlyName = strtr( $dbkey, '/\\*?"<>|~', '_________' );
 740
 741                 # Work out lower case form. We assume we're on a system with case-insensitive
 742                 # filenames, so unless the case is of a special form, we have to disambiguate
 743                 $lowerCase = $this->prefix( ucfirst( strtolower( $this->getDBkey() ) ) );
 744
 745                 # Make it mostly unique
 746                 if ( $lowerCase != $friendlyName  ) {
 747                         $friendlyName .= '_' . substr(md5( $dbkey ), 0, 4);
 748                 }
 749                 # Handle colon specially by replacing it with tilde
 750                 # Thus we reduce the number of paths with hashes appended
 751                 $friendlyName = str_replace( ':', '~', $friendlyName );
 752                 return "$dir/$friendlyName.html";
 753         }
 754
 755         /**
 756          * Get a URL with no fragment or server name.  If this page is generated
 757          * with action=render, $wgServer is prepended.
 758          * @param string $query an optional query string; if not specified,
 759          *      $wgArticlePath will be used.
 760          * @return string the URL
 761          * @access public
 762          */
 763         function getLocalURL( $query = '' ) {
 764                 global $wgLang, $wgArticlePath, $wgScript, $wgMakeDumpLinks, $wgServer, $action;
 765
 766                 if ( $this->isExternal() ) {
 767                         return $this->getFullURL();
 768                 }
 769
 770                 $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 771                 if ( $wgMakeDumpLinks ) {
 772                         $url = str_replace( '$1', wfUrlencode( $this->getHashedFilename() ), $wgArticlePath );
 773                 } elseif ( $query == '' ) {
 774                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 775                 } else {
 776                         global $wgActionPaths;
 777                         if( !empty( $wgActionPaths ) &&
 778                                 preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) ) {
 779                                 $action = urldecode( $matches[2] );
 780                                 if( isset( $wgActionPaths[$action] ) ) {
 781                                         $query = $matches[1];
 782                                         if( isset( $matches[4] ) ) $query .= $matches[4];
 783                                         $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 784                                         if( $query != '' ) $url .= '?' . $query;
 785                                         return $url;
 786                                 }
 787                         }
 788                         if ( $query == '-' ) {
 789                                 $query = '';
 790                         }
 791                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 792                 }
 793
 794                 if ($action == 'render')
 795                         return $wgServer . $url;
 796                 else
 797                         return $url;
 798         }
 799
 800         /**
 801          * Get an HTML-escaped version of the URL form, suitable for
 802          * using in a link, without a server name or fragment
 803          * @param string $query an optional query string
 804          * @return string the URL
 805          * @access public
 806          */
 807         function escapeLocalURL( $query = '' ) {
 808                 return htmlspecialchars( $this->getLocalURL( $query ) );
 809         }
 810
 811         /**
 812          * Get an HTML-escaped version of the URL form, suitable for
 813          * using in a link, including the server name and fragment
 814          *
 815          * @return string the URL
 816          * @param string $query an optional query string
 817          * @access public
 818          */
 819         function escapeFullURL( $query = '' ) {
 820                 return htmlspecialchars( $this->getFullURL( $query ) );
 821         }
 822
 823         /**
 824          * Get the URL form for an internal link.
 825          * - Used in various Squid-related code, in case we have a different
 826          * internal hostname for the server from the exposed one.
 827          *
 828          * @param string $query an optional query string
 829          * @return string the URL
 830          * @access public
 831          */
 832         function getInternalURL( $query = '' ) {
 833                 global $wgInternalServer;
 834                 return $wgInternalServer . $this->getLocalURL( $query );
 835         }
 836
 837         /**
 838          * Get the edit URL for this Title
 839          * @return string the URL, or a null string if this is an
 840          *      interwiki link
 841          * @access public
 842          */
 843         function getEditURL() {
 844                 global $wgServer, $wgScript;
 845
 846                 if ( '' != $this->mInterwiki ) { return ''; }
 847                 $s = $this->getLocalURL( 'action=edit' );
 848
 849                 return $s;
 850         }
 851
 852         /**
 853          * Get the HTML-escaped displayable text form.
 854          * Used for the title field in <a> tags.
 855          * @return string the text, including any prefixes
 856          * @access public
 857          */
 858         function getEscapedText() {
 859                 return htmlspecialchars( $this->getPrefixedText() );
 860         }
 861
 862         /**
 863          * Is this Title interwiki?
 864          * @return boolean
 865          * @access public
 866          */
 867         function isExternal() { return ( '' != $this->mInterwiki ); }
 868
 869         /**
 870          * Does the title correspond to a protected article?
 871          * @param string $what the action the page is protected from,
 872          *      by default checks move and edit
 873          * @return boolean
 874          * @access public
 875          */
 876         function isProtected($action = '') {
 877                 if ( -1 == $this->mNamespace ) { return true; }
 878                 if($action == 'edit' || $action == '') {
 879                         $a = $this->getRestrictions("edit");
 880                         if ( in_array( 'sysop', $a ) ) { return true; }
 881                 }
 882                 if($action == 'move' || $action == '') {
 883                         $a = $this->getRestrictions("move");
 884                         if ( in_array( 'sysop', $a ) ) { return true; }
 885                 }
 886                 return false;
 887         }
 888
 889         /**
 890          * Is $wgUser is watching this page?
 891          * @return boolean
 892          * @access public
 893          */
 894         function userIsWatching() {
 895                 global $wgUser;
 896
 897                 if ( is_null( $this->mWatched ) ) {
 898                         if ( -1 == $this->mNamespace || 0 == $wgUser->getID()) {
 899                                 $this->mWatched = false;
 900                         } else {
 901                                 $this->mWatched = $wgUser->isWatched( $this );
 902                         }
 903                 }
 904                 return $this->mWatched;
 905         }
 906
 907         /**
 908          * Is $wgUser perform $action this page?
 909          * @param string $action action that permission needs to be checked for
 910          * @return boolean
 911          * @access private
 912          */
 913         function userCan($action) {
 914                 $fname = 'Title::userCanEdit';
 915                 wfProfileIn( $fname );
 916
 917                 global $wgUser;
 918                 if( NS_SPECIAL == $this->mNamespace ) {
 919                         wfProfileOut( $fname );
 920                         return false;
 921                 }
 922                 if( NS_MEDIAWIKI == $this->mNamespace &&
 923                     !$wgUser->isAllowed('editinterface') ) {
 924                         wfProfileOut( $fname );
 925                         return false;
 926                 }
 927                 if( $this->mDbkeyform == '_' ) {
 928                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
 929                         wfProfileOut( $fname );
 930                         return false;
 931                 }
 932
 933                 # protect global styles and js
 934                 if ( NS_MEDIAWIKI == $this->mNamespace
 935                  && preg_match("/\\.(css|js)$/", $this->mTextform )
 936                      && !$wgUser->isAllowed('editinterface') ) {
 937                         wfProfileOut( $fname );
 938                         return false;
 939                 }
 940
 941                 # protect css/js subpages of user pages
 942                 # XXX: this might be better using restrictions
 943                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
 944                 if( NS_USER == $this->mNamespace
 945                         && preg_match("/\\.(css|js)$/", $this->mTextform )
 946                         && !$wgUser->isAllowed('editinterface')
 947                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
 948                         wfProfileOut( $fname );
 949                         return false;
 950                 }
 951
 952                 foreach( $this->getRestrictions($action) as $right ) {
 953                         // Backwards compatibility, rewrite sysop -> protect
 954                         if ( $right == 'sysop' ) {
 955                                 $right = 'protect';
 956                         }
 957                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
 958                                 wfProfileOut( $fname );
 959                                 return false;
 960                         }
 961                 }
 962
 963                 if( $action == 'move' &&
 964                         !( $this->isMovable() && $wgUser->isAllowed( 'move' ) ) ) {
 965                         wfProfileOut( $fname );
 966                         return false;
 967                 }
 968
 969                 wfProfileOut( $fname );
 970                 return true;
 971         }
 972
 973         /**
 974          * Can $wgUser edit this page?
 975          * @return boolean
 976          * @access public
 977          */
 978         function userCanEdit() {
 979                 return $this->userCan('edit');
 980         }
 981
 982         /**
 983          * Can $wgUser move this page?
 984          * @return boolean
 985          * @access public
 986          */
 987         function userCanMove() {
 988                 return $this->userCan('move');
 989         }
 990
 991         /**
 992          * Would anybody with sufficient privileges be able to move this page?
 993          * Some pages just aren't movable.
 994          *
 995          * @return boolean
 996          * @access public
 997          */
 998         function isMovable() {
 999                 return Namespace::isMovable( $this->getNamespace() )
1000                         && $this->getInterwiki() == '';
1001         }
1002
1003         /**
1004          * Can $wgUser read this page?
1005          * @return boolean
1006          * @access public
1007          */
1008         function userCanRead() {
1009                 global $wgUser;
1010
1011                 if( $wgUser->isAllowed('read') ) {
1012                         return true;
1013                 } else {
1014                         global $wgWhitelistRead;
1015
1016                         /** If anon users can create an account,
1017                             they need to reach the login page first! */
1018                         if( $wgUser->isAllowed( 'createaccount' )
1019                             && $this->getNamespace() == NS_SPECIAL
1020                             && $this->getText() == 'Userlogin' ) {
1021                                 return true;
1022                         }
1023
1024                         /** some pages are explicitly allowed */
1025                         $name = $this->getPrefixedText();
1026                         if( $wgWhitelistRead && in_array( $name, $wgWhitelistRead ) ) {
1027                                 return true;
1028                         }
1029
1030                         # Compatibility with old settings
1031                         if( $wgWhitelistRead && $this->getNamespace() == NS_MAIN ) {
1032                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
1033                                         return true;
1034                                 }
1035                         }
1036                 }
1037                 return false;
1038         }
1039
1040         /**
1041          * Is this a talk page of some sort?
1042          * @return bool
1043          * @access public
1044          */
1045         function isTalkPage() {
1046                 return Namespace::isTalk( $this->getNamespace() );
1047         }
1048
1049         /**
1050          * Is this a .css or .js subpage of a user page?
1051          * @return bool
1052          * @access public
1053          */
1054         function isCssJsSubpage() {
1055                 return ( NS_USER == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
1056         }
1057         /**
1058          * Is this a .css subpage of a user page?
1059          * @return bool
1060          * @access public
1061          */
1062         function isCssSubpage() {
1063                 return ( NS_USER == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
1064         }
1065         /**
1066          * Is this a .js subpage of a user page?
1067          * @return bool
1068          * @access public
1069          */
1070         function isJsSubpage() {
1071                 return ( NS_USER == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
1072         }
1073         /**
1074          * Protect css/js subpages of user pages: can $wgUser edit
1075          * this page?
1076          *
1077          * @return boolean
1078          * @todo XXX: this might be better using restrictions
1079          * @access public
1080          */
1081         function userCanEditCssJsSubpage() {
1082                 global $wgUser;
1083                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1084         }
1085
1086         /**
1087          * Loads a string into mRestrictions array
1088          * @param string $res restrictions in string format
1089          * @access public
1090          */
1091         function loadRestrictions( $res ) {
1092                 foreach( explode( ':', trim( $res ) ) as $restrict ) {
1093                         $temp = explode( '=', trim( $restrict ) );
1094                         if(count($temp) == 1) {
1095                                 // old format should be treated as edit/move restriction
1096                                 $this->mRestrictions["edit"] = explode( ',', trim( $temp[0] ) );
1097                                 $this->mRestrictions["move"] = explode( ',', trim( $temp[0] ) );
1098                         } else {
1099                                 $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1100                         }
1101                 }
1102                 $this->mRestrictionsLoaded = true;
1103         }
1104
1105         /**
1106          * Accessor/initialisation for mRestrictions
1107          * @param string $action action that permission needs to be checked for
1108          * @return array the array of groups allowed to edit this article
1109          * @access public
1110          */
1111         function getRestrictions($action) {
1112                 $id = $this->getArticleID();
1113                 if ( 0 == $id ) { return array(); }
1114
1115                 if ( ! $this->mRestrictionsLoaded ) {
1116                         $dbr =& wfGetDB( DB_SLAVE );
1117                         $res = $dbr->selectField( 'page', 'page_restrictions', 'page_id='.$id );
1118                         $this->loadRestrictions( $res );
1119                 }
1120                 if( isset( $this->mRestrictions[$action] ) ) {
1121                         return $this->mRestrictions[$action];
1122                 }
1123                 return array();
1124         }
1125
1126         /**
1127          * Is there a version of this page in the deletion archive?
1128          * @return int the number of archived revisions
1129          * @access public
1130          */
1131         function isDeleted() {
1132                 $fname = 'Title::isDeleted';
1133                 if ( $this->getNamespace() < 0 ) {
1134                         $n = 0;
1135                 } else {
1136                         $dbr =& wfGetDB( DB_SLAVE );
1137                         $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1138                                 'ar_title' => $this->getDBkey() ), $fname );
1139                 }
1140                 return (int)$n;
1141         }
1142
1143         /**
1144          * Get the article ID for this Title from the link cache,
1145          * adding it if necessary
1146          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1147          *      for update
1148          * @return int the ID
1149          * @access public
1150          */
1151         function getArticleID( $flags = 0 ) {
1152                 global $wgLinkCache;
1153                 if ( $flags & GAID_FOR_UPDATE ) {
1154                         $oldUpdate = $wgLinkCache->forUpdate( true );
1155                         $this->mArticleID = $wgLinkCache->addLinkObj( $this );
1156                         $wgLinkCache->forUpdate( $oldUpdate );
1157                 } else {
1158                         if ( -1 == $this->mArticleID ) {
1159                                 $this->mArticleID = $wgLinkCache->addLinkObj( $this );
1160                         }
1161                 }
1162                 return $this->mArticleID;
1163         }
1164
1165         function getLatestRevID() {
1166                 if ($this->mLatestID !== false)
1167                         return $this->mLatestID;
1168
1169                 $db =& wfGetDB(DB_SLAVE);
1170                 return $this->mLatestID = $db->selectField( 'revision',
1171                         "max(rev_id)",
1172                         array('rev_page' => $this->getArticleID()),
1173                         'Title::getLatestRevID' );
1174         }
1175
1176         /**
1177          * This clears some fields in this object, and clears any associated
1178          * keys in the "bad links" section of $wgLinkCache.
1179          *
1180          * - This is called from Article::insertNewArticle() to allow
1181          * loading of the new page_id. It's also called from
1182          * Article::doDeleteArticle()
1183          *
1184          * @param int $newid the new Article ID
1185          * @access public
1186          */
1187         function resetArticleID( $newid ) {
1188                 global $wgLinkCache;
1189                 $wgLinkCache->clearBadLink( $this->getPrefixedDBkey() );
1190
1191                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1192                 else { $this->mArticleID = $newid; }
1193                 $this->mRestrictionsLoaded = false;
1194                 $this->mRestrictions = array();
1195         }
1196
1197         /**
1198          * Updates page_touched for this page; called from LinksUpdate.php
1199          * @return bool true if the update succeded
1200          * @access public
1201          */
1202         function invalidateCache() {
1203                 global $wgUseFileCache;
1204
1205                 if ( wfReadOnly() ) {
1206                         return;
1207                 }
1208
1209                 $now = wfTimestampNow();
1210                 $dbw =& wfGetDB( DB_MASTER );
1211                 $success = $dbw->update( 'page',
1212                         array( /* SET */
1213                                 'page_touched' => $dbw->timestamp()
1214                         ), array( /* WHERE */
1215                                 'page_namespace' => $this->getNamespace() ,
1216                                 'page_title' => $this->getDBkey()
1217                         ), 'Title::invalidateCache'
1218                 );
1219
1220                 if ($wgUseFileCache) {
1221                         $cache = new CacheManager($this);
1222                         @unlink($cache->fileCacheName());
1223                 }
1224
1225                 return $success;
1226         }
1227
1228         /**
1229          * Prefix some arbitrary text with the namespace or interwiki prefix
1230          * of this object
1231          *
1232          * @param string $name the text
1233          * @return string the prefixed text
1234          * @access private
1235          */
1236         /* private */ function prefix( $name ) {
1237                 global $wgContLang;
1238
1239                 $p = '';
1240                 if ( '' != $this->mInterwiki ) {
1241                         $p = $this->mInterwiki . ':';
1242                 }
1243                 if ( 0 != $this->mNamespace ) {
1244                         $p .= $wgContLang->getNsText( $this->mNamespace ) . ':';
1245                 }
1246                 return $p . $name;
1247         }
1248
1249         /**
1250          * Secure and split - main initialisation function for this object
1251          *
1252          * Assumes that mDbkeyform has been set, and is urldecoded
1253          * and uses underscores, but not otherwise munged.  This function
1254          * removes illegal characters, splits off the interwiki and
1255          * namespace prefixes, sets the other forms, and canonicalizes
1256          * everything.
1257          * @return bool true on success
1258          * @access private
1259          */
1260         /* private */ function secureAndSplit() {
1261                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1262                 $fname = 'Title::secureAndSplit';
1263                 wfProfileIn( $fname );
1264
1265                 # Initialisation
1266                 static $rxTc = false;
1267                 if( !$rxTc ) {
1268                         # % is needed as well
1269                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/S';
1270                 }
1271
1272                 $this->mInterwiki = $this->mFragment = '';
1273                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1274
1275                 # Clean up whitespace
1276                 #
1277                 $t = preg_replace( '/[ _]+/', '_', $this->mDbkeyform );
1278                 $t = trim( $t, '_' );
1279
1280                 if ( '' == $t ) {
1281                         wfProfileOut( $fname );
1282                         return false;
1283                 }
1284
1285                 if( false !== strpos( $t, UTF8_REPLACEMENT ) ) {
1286                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1287                         wfProfileOut( $fname );
1288                         return false;
1289                 }
1290
1291                 $this->mDbkeyform = $t;
1292
1293                 # Initial colon indicates main namespace rather than specified default
1294                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
1295                 if ( ':' == $t{0} ) {
1296                         $this->mNamespace = NS_MAIN;
1297                         $t = substr( $t, 1 ); # remove the colon but continue processing
1298                 }
1299
1300                 # Namespace or interwiki prefix
1301                 $firstPass = true;
1302                 do {
1303                         if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $t, $m ) ) {
1304                                 $p = $m[1];
1305                                 $lowerNs = strtolower( $p );
1306                                 if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1307                                         # Canonical namespace
1308                                         $t = $m[2];
1309                                         $this->mNamespace = $ns;
1310                                 } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1311                                         # Ordinary namespace
1312                                         $t = $m[2];
1313                                         $this->mNamespace = $ns;
1314                                 } elseif( $this->getInterwikiLink( $p ) ) {
1315                                         if( !$firstPass ) {
1316                                                 # Can't make a local interwiki link to an interwiki link.
1317                                                 # That's just crazy!
1318                                                 wfProfileOut( $fname );
1319                                                 return false;
1320                                         }
1321
1322                                         # Interwiki link
1323                                         $t = $m[2];
1324                                         $this->mInterwiki = $p;
1325
1326                                         # Redundant interwiki prefix to the local wiki
1327                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1328                                                 if( $t == '' ) {
1329                                                         # Can't have an empty self-link
1330                                                         wfProfileOut( $fname );
1331                                                         return false;
1332                                                 }
1333                                                 $this->mInterwiki = '';
1334                                                 $firstPass = false;
1335                                                 # Do another namespace split...
1336                                                 continue;
1337                                         }
1338                                 }
1339                                 # If there's no recognized interwiki or namespace,
1340                                 # then let the colon expression be part of the title.
1341                         }
1342                         break;
1343                 } while( true );
1344                 $r = $t;
1345
1346                 # We already know that some pages won't be in the database!
1347                 #
1348                 if ( '' != $this->mInterwiki || -1 == $this->mNamespace ) {
1349                         $this->mArticleID = 0;
1350                 }
1351                 $f = strstr( $r, '#' );
1352                 if ( false !== $f ) {
1353                         $this->mFragment = substr( $f, 1 );
1354                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
1355                         # remove whitespace again: prevents "Foo_bar_#"
1356                         # becoming "Foo_bar_"
1357                         $r = preg_replace( '/_*$/', '', $r );
1358                 }
1359
1360                 # Reject illegal characters.
1361                 #
1362                 if( preg_match( $rxTc, $r ) ) {
1363                         wfProfileOut( $fname );
1364                         return false;
1365                 }
1366
1367                 /**
1368                  * Pages with "/./" or "/../" appearing in the URLs will
1369                  * often be unreachable due to the way web browsers deal
1370                  * with 'relative' URLs. Forbid them explicitly.
1371                  */
1372                 if ( strpos( $r, '.' ) !== false &&
1373                      ( $r === '.' || $r === '..' ||
1374                        strpos( $r, './' ) === 0  ||
1375                        strpos( $r, '../' ) === 0 ||
1376                        strpos( $r, '/./' ) !== false ||
1377                        strpos( $r, '/../' ) !== false ) )
1378                 {
1379                         wfProfileOut( $fname );
1380                         return false;
1381                 }
1382
1383                 # We shouldn't need to query the DB for the size.
1384                 #$maxSize = $dbr->textFieldSize( 'page', 'page_title' );
1385                 if ( strlen( $r ) > 255 ) {
1386                         wfProfileOut( $fname );
1387                         return false;
1388                 }
1389
1390                 /**
1391                  * Normally, all wiki links are forced to have
1392                  * an initial capital letter so [[foo]] and [[Foo]]
1393                  * point to the same place.
1394                  *
1395                  * Don't force it for interwikis, since the other
1396                  * site might be case-sensitive.
1397                  */
1398                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1399                         $t = $wgContLang->ucfirst( $r );
1400                 } else {
1401                         $t = $r;
1402                 }
1403
1404                 /**
1405                  * Can't make a link to a namespace alone...
1406                  * "empty" local links can only be self-links
1407                  * with a fragment identifier.
1408                  */
1409                 if( $t == '' &&
1410                         $this->mInterwiki == '' &&
1411                         $this->mNamespace != NS_MAIN ) {
1412                         wfProfileOut( $fname );
1413                         return false;
1414                 }
1415
1416                 # Fill fields
1417                 $this->mDbkeyform = $t;
1418                 $this->mUrlform = wfUrlencode( $t );
1419
1420                 $this->mTextform = str_replace( '_', ' ', $t );
1421
1422                 wfProfileOut( $fname );
1423                 return true;
1424         }
1425
1426         /**
1427          * Get a Title object associated with the talk page of this article
1428          * @return Title the object for the talk page
1429          * @access public
1430          */
1431         function getTalkPage() {
1432                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1433         }
1434
1435         /**
1436          * Get a title object associated with the subject page of this
1437          * talk page
1438          *
1439          * @return Title the object for the subject page
1440          * @access public
1441          */
1442         function getSubjectPage() {
1443                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1444         }
1445
1446         /**
1447          * Get an array of Title objects linking to this Title
1448          * Also stores the IDs in the link cache.
1449          *
1450          * @param string $options may be FOR UPDATE
1451          * @return array the Title objects linking here
1452          * @access public
1453          */
1454         function getLinksTo( $options = '' ) {
1455                 global $wgLinkCache;
1456                 $id = $this->getArticleID();
1457
1458                 if ( $options ) {
1459                         $db =& wfGetDB( DB_MASTER );
1460                 } else {
1461                         $db =& wfGetDB( DB_SLAVE );
1462                 }
1463
1464                 $res = $db->select( array( 'page', 'pagelinks' ),
1465                         array( 'page_namespace', 'page_title', 'page_id' ),
1466                         array(
1467                                 'pl_from=page_id',
1468                                 'pl_namespace' => $this->getNamespace(),
1469                                 'pl_title'     => $this->getDbKey() ),
1470                         'Title::getLinksTo',
1471                         $options );
1472
1473                 $retVal = array();
1474                 if ( $db->numRows( $res ) ) {
1475                         while ( $row = $db->fetchObject( $res ) ) {
1476                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1477                                         $wgLinkCache->addGoodLinkObj( $row->page_id, $titleObj );
1478                                         $retVal[] = $titleObj;
1479                                 }
1480                         }
1481                 }
1482                 $db->freeResult( $res );
1483                 return $retVal;
1484         }
1485
1486         /**
1487          * Get an array of Title objects referring to non-existent articles linked from this page
1488          *
1489          * @param string $options may be FOR UPDATE
1490          * @return array the Title objects
1491          * @access public
1492          */
1493         function getBrokenLinksFrom( $options = '' ) {
1494                 global $wgLinkCache;
1495
1496                 if ( $options ) {
1497                         $db =& wfGetDB( DB_MASTER );
1498                 } else {
1499                         $db =& wfGetDB( DB_SLAVE );
1500                 }
1501
1502                 $res = $db->safeQuery(
1503                           "SELECT pl_namespace, pl_title
1504                              FROM !
1505                         LEFT JOIN !
1506                                ON pl_namespace=page_namespace
1507                               AND pl_title=page_title
1508                             WHERE pl_from=?
1509                               AND page_namespace IS NULL
1510                                   !",
1511                         $db->tableName( 'pagelinks' ),
1512                         $db->tableName( 'page' ),
1513                         $this->getArticleId(),
1514                         $options );
1515
1516                 $retVal = array();
1517                 if ( $db->numRows( $res ) ) {
1518                         while ( $row = $db->fetchObject( $res ) ) {
1519                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
1520                         }
1521                 }
1522                 $db->freeResult( $res );
1523                 return $retVal;
1524         }
1525
1526
1527         /**
1528          * Get a list of URLs to purge from the Squid cache when this
1529          * page changes
1530          *
1531          * @return array the URLs
1532          * @access public
1533          */
1534         function getSquidURLs() {
1535                 return array(
1536                         $this->getInternalURL(),
1537                         $this->getInternalURL( 'action=history' )
1538                 );
1539         }
1540
1541         /**
1542          * Move this page without authentication
1543          * @param Title &$nt the new page Title
1544          * @access public
1545          */
1546         function moveNoAuth( &$nt ) {
1547                 return $this->moveTo( $nt, false );
1548         }
1549
1550         /**
1551          * Check whether a given move operation would be valid.
1552          * Returns true if ok, or a message key string for an error message
1553          * if invalid. (Scarrrrry ugly interface this.)
1554          * @param Title &$nt the new title
1555          * @param bool $auth indicates whether $wgUser's permissions
1556          *      should be checked
1557          * @return mixed true on success, message name on failure
1558          * @access public
1559          */
1560         function isValidMoveOperation( &$nt, $auth = true, $reason = '' ) {
1561                 global $wgUser;
1562                 if( !$this or !$nt ) {
1563                         return 'badtitletext';
1564                 }
1565                 if( $this->equals( $nt ) ) {
1566                         return 'selfmove';
1567                 }
1568                 if( !$this->isMovable() || !$nt->isMovable() ) {
1569                         return 'immobile_namespace';
1570                 }
1571
1572                 $fname = 'Title::move';
1573                 $oldid = $this->getArticleID();
1574                 $newid = $nt->getArticleID();
1575
1576                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1577                         return 'articleexists';
1578                 }
1579                 if ( ( '' == $this->getDBkey() ) ||
1580                          ( !$oldid ) ||
1581                      ( '' == $nt->getDBkey() ) ) {
1582                         return 'badarticleerror';
1583                 }
1584
1585                 if ( $auth && (
1586                                 !$this->userCanEdit() || !$nt->userCanEdit() ||
1587                                 !$this->userCanMove() || !$nt->userCanMove() ) ) {
1588                         return 'protectedpage';
1589                 }
1590
1591                 # The move is allowed only if (1) the target doesn't exist, or
1592                 # (2) the target is a redirect to the source, and has no history
1593                 # (so we can undo bad moves right after they're done).
1594
1595                 if ( 0 != $newid ) { # Target exists; check for validity
1596                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1597                                 return 'articleexists';
1598                         }
1599                 }
1600                 return true;
1601         }
1602
1603         /**
1604          * Move a title to a new location
1605          * @param Title &$nt the new title
1606          * @param bool $auth indicates whether $wgUser's permissions
1607          *      should be checked
1608          * @return mixed true on success, message name on failure
1609          * @access public
1610          */
1611         function moveTo( &$nt, $auth = true, $reason = '' ) {
1612                 $err = $this->isValidMoveOperation( $nt, $auth, $reason );
1613                 if( is_string( $err ) ) {
1614                         return $err;
1615                 }
1616
1617                 $pageid = $this->getArticleID();
1618                 if( $nt->exists() ) {
1619                         $this->moveOverExistingRedirect( $nt, $reason );
1620                         $pageCountChange = 0;
1621                 } else { # Target didn't exist, do normal move.
1622                         $this->moveToNewTitle( $nt, $newid, $reason );
1623                         $pageCountChange = 1;
1624                 }
1625                 $redirid = $this->getArticleID();
1626
1627                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
1628                 $dbw =& wfGetDB( DB_MASTER );
1629                 $categorylinks = $dbw->tableName( 'categorylinks' );
1630                 $sql = "UPDATE $categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
1631                         " WHERE cl_from=" . $dbw->addQuotes( $pageid ) .
1632                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
1633                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
1634
1635                 # Update watchlists
1636
1637                 $oldnamespace = $this->getNamespace() & ~1;
1638                 $newnamespace = $nt->getNamespace() & ~1;
1639                 $oldtitle = $this->getDBkey();
1640                 $newtitle = $nt->getDBkey();
1641
1642                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
1643                         WatchedItem::duplicateEntries( $this, $nt );
1644                 }
1645
1646                 # Update search engine
1647                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
1648                 $u->doUpdate();
1649                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
1650                 $u->doUpdate();
1651
1652                 # Update site_stats
1653                 if ( $this->getNamespace() == NS_MAIN and $nt->getNamespace() != NS_MAIN ) {
1654                         # Moved out of main namespace
1655                         # not viewed, edited, removing
1656                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange);
1657                 } elseif ( $this->getNamespace() != NS_MAIN and $nt->getNamespace() == NS_MAIN ) {
1658                         # Moved into main namespace
1659                         # not viewed, edited, adding
1660                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
1661                 } elseif ( $pageCountChange ) {
1662                         # Added redirect
1663                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
1664                 } else{
1665                         $u = false;
1666                 }
1667                 if ( $u ) {
1668                         $u->doUpdate();
1669                 }
1670
1671                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
1672                 return true;
1673         }
1674
1675         /**
1676          * Move page to a title which is at present a redirect to the
1677          * source page
1678          *
1679          * @param Title &$nt the page to move to, which should currently
1680          *      be a redirect
1681          * @access private
1682          */
1683         function moveOverExistingRedirect( &$nt, $reason = '' ) {
1684                 global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
1685                 $fname = 'Title::moveOverExistingRedirect';
1686                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1687
1688                 if ( $reason ) {
1689                         $comment .= ": $reason";
1690                 }
1691
1692                 $now = wfTimestampNow();
1693                 $rand = wfRandom();
1694                 $newid = $nt->getArticleID();
1695                 $oldid = $this->getArticleID();
1696                 $dbw =& wfGetDB( DB_MASTER );
1697                 $links = $dbw->tableName( 'links' );
1698
1699                 # Delete the old redirect. We don't save it to history since
1700                 # by definition if we've got here it's rather uninteresting.
1701                 # We have to remove it so that the next step doesn't trigger
1702                 # a conflict on the unique namespace+title index...
1703                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
1704
1705                 # Save a null revision in the page's history notifying of the move
1706                 $nullRevision = Revision::newNullRevision( $dbw, $oldid,
1707                         wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() ),
1708                         true );
1709                 $nullRevId = $nullRevision->insertOn( $dbw );
1710
1711                 # Change the name of the target page:
1712                 $dbw->update( 'page',
1713                         /* SET */ array(
1714                                 'page_touched'   => $dbw->timestamp($now),
1715                                 'page_namespace' => $nt->getNamespace(),
1716                                 'page_title'     => $nt->getDBkey(),
1717                                 'page_latest'    => $nullRevId,
1718                         ),
1719                         /* WHERE */ array( 'page_id' => $oldid ),
1720                         $fname
1721                 );
1722                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1723
1724                 # Recreate the redirect, this time in the other direction.
1725                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1726                 $redirectArticle = new Article( $this );
1727                 $newid = $redirectArticle->insertOn( $dbw );
1728                 $redirectRevision = new Revision( array(
1729                         'page'    => $newid,
1730                         'comment' => $comment,
1731                         'text'    => $redirectText ) );
1732                 $revid = $redirectRevision->insertOn( $dbw );
1733                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1734                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1735
1736                 # Log the move
1737                 $log = new LogPage( 'move' );
1738                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
1739
1740                 # Now, we record the link from the redirect to the new title.
1741                 # It should have no other outgoing links...
1742                 $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
1743                 $dbw->insert( 'pagelinks',
1744                         array(
1745                                 'pl_from'      => $newid,
1746                                 'pl_namespace' => $nt->getNamespace(),
1747                                 'pl_title'     => $nt->getDbKey() ),
1748                         $fname );
1749
1750                 # Purge squid
1751                 if ( $wgUseSquid ) {
1752                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1753                         $u = new SquidUpdate( $urls );
1754                         $u->doUpdate();
1755                 }
1756         }
1757
1758         /**
1759          * Move page to non-existing title.
1760          * @param Title &$nt the new Title
1761          * @param int &$newid set to be the new article ID
1762          * @access private
1763          */
1764         function moveToNewTitle( &$nt, &$newid, $reason = '' ) {
1765                 global $wgUser, $wgLinkCache, $wgUseSquid;
1766                 global $wgMwRedir;
1767                 $fname = 'MovePageForm::moveToNewTitle';
1768                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1769                 if ( $reason ) {
1770                         $comment .= ": $reason";
1771                 }
1772
1773                 $newid = $nt->getArticleID();
1774                 $oldid = $this->getArticleID();
1775                 $dbw =& wfGetDB( DB_MASTER );
1776                 $now = $dbw->timestamp();
1777                 wfSeedRandom();
1778                 $rand = wfRandom();
1779
1780                 # Save a null revision in the page's history notifying of the move
1781                 $nullRevision = Revision::newNullRevision( $dbw, $oldid,
1782                         wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() ),
1783                         true );
1784                 $nullRevId = $nullRevision->insertOn( $dbw );
1785
1786                 # Rename cur entry
1787                 $dbw->update( 'page',
1788                         /* SET */ array(
1789                                 'page_touched'   => $now,
1790                                 'page_namespace' => $nt->getNamespace(),
1791                                 'page_title'     => $nt->getDBkey(),
1792                                 'page_latest'    => $nullRevId,
1793                         ),
1794                         /* WHERE */ array( 'page_id' => $oldid ),
1795                         $fname
1796                 );
1797
1798                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1799
1800                 # Insert redirect
1801                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1802                 $redirectArticle = new Article( $this );
1803                 $newid = $redirectArticle->insertOn( $dbw );
1804                 $redirectRevision = new Revision( array(
1805                         'page'    => $newid,
1806                         'comment' => $comment,
1807                         'text'    => $redirectText ) );
1808                 $revid = $redirectRevision->insertOn( $dbw );
1809                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1810                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1811
1812                 # Log the move
1813                 $log = new LogPage( 'move' );
1814                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
1815
1816                 # Purge caches as per article creation
1817                 Article::onArticleCreate( $nt );
1818
1819                 # Record the just-created redirect's linking to the page
1820                 $dbw->insert( 'pagelinks',
1821                         array(
1822                                 'pl_from'      => $newid,
1823                                 'pl_namespace' => $nt->getNamespace(),
1824                                 'pl_title'     => $nt->getDBkey() ),
1825                         $fname );
1826
1827                 # Non-existent target may have had broken links to it; these must
1828                 # now be touched to update link coloring.
1829                 $nt->touchLinks();
1830
1831                 # Purge old title from squid
1832                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1833                 $titles = $nt->getLinksTo();
1834                 if ( $wgUseSquid ) {
1835                         $urls = $this->getSquidURLs();
1836                         foreach ( $titles as $linkTitle ) {
1837                                 $urls[] = $linkTitle->getInternalURL();
1838                         }
1839                         $u = new SquidUpdate( $urls );
1840                         $u->doUpdate();
1841                 }
1842         }
1843
1844         /**
1845          * Checks if $this can be moved to a given Title
1846          * - Selects for update, so don't call it unless you mean business
1847          *
1848          * @param Title &$nt the new title to check
1849          * @access public
1850          */
1851         function isValidMoveTarget( $nt ) {
1852
1853                 $fname = 'Title::isValidMoveTarget';
1854                 $dbw =& wfGetDB( DB_MASTER );
1855
1856                 # Is it a redirect?
1857                 $id  = $nt->getArticleID();
1858                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
1859                         array( 'page_is_redirect','old_text' ),
1860                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
1861                         $fname, 'FOR UPDATE' );
1862
1863                 if ( !$obj || 0 == $obj->page_is_redirect ) {
1864                         # Not a redirect
1865                         return false;
1866                 }
1867
1868                 # Does the redirect point to the source?
1869                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $obj->old_text, $m ) ) {
1870                         $redirTitle = Title::newFromText( $m[1] );
1871                         if( !is_object( $redirTitle ) ||
1872                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1873                                 return false;
1874                         }
1875                 }
1876
1877                 # Does the article have a history?
1878                 $row = $dbw->selectRow( array( 'page', 'revision'),
1879                         array( 'rev_id' ),
1880                         array( 'page_namespace' => $nt->getNamespace(),
1881                                 'page_title' => $nt->getDBkey(),
1882                                 'page_id=rev_page AND page_latest != rev_id'
1883                         ), $fname, 'FOR UPDATE'
1884                 );
1885
1886                 # Return true if there was no history
1887                 return $row === false;
1888         }
1889
1890         /**
1891          * Create a redirect; fails if the title already exists; does
1892          * not notify RC
1893          *
1894          * @param Title $dest the destination of the redirect
1895          * @param string $comment the comment string describing the move
1896          * @return bool true on success
1897          * @access public
1898          */
1899         function createRedirect( $dest, $comment ) {
1900                 global $wgUser;
1901                 if ( $this->getArticleID() ) {
1902                         return false;
1903                 }
1904
1905                 $fname = 'Title::createRedirect';
1906                 $dbw =& wfGetDB( DB_MASTER );
1907
1908                 $article = new Article( $this );
1909                 $newid = $article->insertOn( $dbw );
1910                 $revision = new Revision( array(
1911                         'page'      => $newid,
1912                         'comment'   => $comment,
1913                         'text'      => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n",
1914                         ) );
1915                 $revisionId = $revision->insertOn( $dbw );
1916                 $article->updateRevisionOn( $dbw, $revision, 0 );
1917
1918                 # Link table
1919                 $dbw->insert( 'pagelinks',
1920                         array(
1921                                 'pl_from'      => $newid,
1922                                 'pl_namespace' => $dest->getNamespace(),
1923                                 'pl_title'     => $dest->getDbKey()
1924                         ), $fname
1925                 );
1926
1927                 Article::onArticleCreate( $this );
1928                 return true;
1929         }
1930
1931         /**
1932          * Get categories to which this Title belongs and return an array of
1933          * categories' names.
1934          *
1935          * @return array an array of parents in the form:
1936          *      $parent => $currentarticle
1937          * @access public
1938          */
1939         function getParentCategories() {
1940                 global $wgContLang,$wgUser;
1941
1942                 $titlekey = $this->getArticleId();
1943                 $sk =& $wgUser->getSkin();
1944                 $parents = array();
1945                 $dbr =& wfGetDB( DB_SLAVE );
1946                 $categorylinks = $dbr->tableName( 'categorylinks' );
1947
1948                 # NEW SQL
1949                 $sql = "SELECT * FROM $categorylinks"
1950                      ." WHERE cl_from='$titlekey'"
1951                          ." AND cl_from <> '0'"
1952                          ." ORDER BY cl_sortkey";
1953
1954                 $res = $dbr->query ( $sql ) ;
1955
1956                 if($dbr->numRows($res) > 0) {
1957                         while ( $x = $dbr->fetchObject ( $res ) )
1958                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
1959                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
1960                         $dbr->freeResult ( $res ) ;
1961                 } else {
1962                         $data = '';
1963                 }
1964                 return $data;
1965         }
1966
1967         /**
1968          * Get a tree of parent categories
1969          * @param array $children an array with the children in the keys, to check for circular refs
1970          * @return array
1971          * @access public
1972          */
1973         function getParentCategoryTree( $children = array() ) {
1974                 $parents = $this->getParentCategories();
1975
1976                 if($parents != '') {
1977                         foreach($parents as $parent => $current)
1978                         {
1979                                 if ( array_key_exists( $parent, $children ) ) {
1980                                         # Circular reference
1981                                         $stack[$parent] = array();
1982                                 } else {
1983                                         $nt = Title::newFromText($parent);
1984                                         $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
1985                                 }
1986                         }
1987                         return $stack;
1988                 } else {
1989                         return array();
1990                 }
1991         }
1992
1993
1994         /**
1995          * Get an associative array for selecting this title from
1996          * the "cur" table
1997          *
1998          * @return array
1999          * @access public
2000          */
2001         function curCond() {
2002                 wfDebugDieBacktrace( 'curCond called' );
2003                 return array( 'cur_namespace' => $this->mNamespace, 'cur_title' => $this->mDbkeyform );
2004         }
2005
2006         /**
2007          * Get an associative array for selecting this title from the
2008          * "old" table
2009          *
2010          * @return array
2011          * @access public
2012          */
2013         function oldCond() {
2014                 wfDebugDieBacktrace( 'oldCond called' );
2015                 return array( 'old_namespace' => $this->mNamespace, 'old_title' => $this->mDbkeyform );
2016         }
2017
2018         /**
2019          * Get the revision ID of the previous revision
2020          *
2021          * @param integer $revision  Revision ID. Get the revision that was before this one.
2022          * @return interger $oldrevision|false
2023          */
2024         function getPreviousRevisionID( $revision ) {
2025                 $dbr =& wfGetDB( DB_SLAVE );
2026                 return $dbr->selectField( 'revision', 'rev_id',
2027                         'rev_page=' . intval( $this->getArticleId() ) .
2028                         ' AND rev_id<' . intval( $revision ) . ' ORDER BY rev_id DESC' );
2029         }
2030
2031         /**
2032          * Get the revision ID of the next revision
2033          *
2034          * @param integer $revision  Revision ID. Get the revision that was after this one.
2035          * @return interger $oldrevision|false
2036          */
2037         function getNextRevisionID( $revision ) {
2038                 $dbr =& wfGetDB( DB_SLAVE );
2039                 return $dbr->selectField( 'revision', 'rev_id',
2040                         'rev_page=' . intval( $this->getArticleId() ) .
2041                         ' AND rev_id>' . intval( $revision ) . ' ORDER BY rev_id' );
2042         }
2043
2044         /**
2045          * Compare with another title.
2046          *
2047          * @param Title $title
2048          * @return bool
2049          */
2050         function equals( &$title ) {
2051                 return $this->getInterwiki() == $title->getInterwiki()
2052                         && $this->getNamespace() == $title->getNamespace()
2053                         && $this->getDbkey() == $title->getDbkey();
2054         }
2055
2056         /**
2057          * Check if page exists
2058          * @return bool
2059          */
2060         function exists() {
2061                 return $this->getArticleId() != 0;
2062         }
2063
2064         /**
2065          * Should a link should be displayed as a known link, just based on its title?
2066          *
2067          * Currently, a self-link with a fragment, special pages and image pages are in
2068          * this category. Special pages never exist in the database. Some images do not
2069          * have description pages in the database, but the description page contains
2070          * useful history information that the user may want to link to.
2071          */
2072         function isAlwaysKnown() {
2073                 return  $this->isExternal() || ( 0 == $this->mNamespace && "" == $this->mDbkeyform )
2074                   || NS_SPECIAL == $this->mNamespace || NS_IMAGE == $this->mNamespace;
2075         }
2076
2077         /**
2078          * Update page_touched timestamps on pages linking to this title.
2079          * In principal, this could be backgrounded and could also do squid
2080          * purging.
2081          */
2082         function touchLinks() {
2083                 $fname = 'Title::touchLinks';
2084
2085                 $dbw =& wfGetDB( DB_MASTER );
2086
2087                 $res = $dbw->select( 'pagelinks',
2088                         array( 'pl_from' ),
2089                         array(
2090                                 'pl_namespace' => $this->getNamespace(),
2091                                 'pl_title'     => $this->getDbKey() ),
2092                         $fname );
2093                 if ( 0 == $dbw->numRows( $res ) ) {
2094                         return;
2095                 }
2096
2097                 $arr = array();
2098                 $toucharr = array();
2099                 while( $row = $dbw->fetchObject( $res ) ) {
2100                         $toucharr[] = $row->pl_from;
2101                 }
2102                 if (!count($toucharr))
2103                         return;
2104                 $dbw->update( 'page', /* SET */ array( 'page_touched' => $dbw->timestamp() ),
2105                                                         /* WHERE */ array( 'page_id' => $toucharr ),$fname);
2106         }
2107
2108         function trackbackURL() {
2109                 global $wgTitle, $wgScriptPath, $wgServer;
2110
2111                 return "$wgServer$wgScriptPath/trackback.php?article="
2112                         . htmlspecialchars(urlencode($wgTitle->getPrefixedDBkey()));
2113         }
2114
2115         function trackbackRDF() {
2116                 $url = htmlspecialchars($this->getFullURL());
2117                 $title = htmlspecialchars($this->getText());
2118                 $tburl = $this->trackbackURL();
2119
2120                 return "
2121 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
2122          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
2123          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
2124 <rdf:Description
2125    rdf:about=\"$url\"
2126    dc:identifier=\"$url\"
2127    dc:title=\"$title\"
2128    trackback:ping=\"$tburl\" />
2129 </rdf:RDF>";
2130         }
2131 }
2132 ?>