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                 $key = strtolower( $key );
 397
 398                 $k = $wgDBname.':interwiki:'.$key;
 399                 if( array_key_exists( $k, $wgTitleInterwikiCache ) ) {
 400                         wfProfileOut( $fname );
 401                         return $wgTitleInterwikiCache[$k]->iw_url;
 402                 }
 403
 404                 $s = $wgMemc->get( $k );
 405                 # Ignore old keys with no iw_local
 406                 if( $s && isset( $s->iw_local ) && isset($s->iw_trans)) {
 407                         $wgTitleInterwikiCache[$k] = $s;
 408                         wfProfileOut( $fname );
 409                         return $s->iw_url;
 410                 }
 411
 412                 $dbr =& wfGetDB( DB_SLAVE );
 413                 $res = $dbr->select( 'interwiki',
 414                         array( 'iw_url', 'iw_local', 'iw_trans' ),
 415                         array( 'iw_prefix' => $key ), $fname );
 416                 if( !$res ) {
 417                         wfProfileOut( $fname );
 418                         return '';
 419                 }
 420
 421                 $s = $dbr->fetchObject( $res );
 422                 if( !$s ) {
 423                         # Cache non-existence: create a blank object and save it to memcached
 424                         $s = (object)false;
 425                         $s->iw_url = '';
 426                         $s->iw_local = 0;
 427                         $s->iw_trans = 0;
 428                 }
 429                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 430                 $wgTitleInterwikiCache[$k] = $s;
 431
 432                 wfProfileOut( $fname );
 433                 return $s->iw_url;
 434         }
 435
 436         /**
 437          * Determine whether the object refers to a page within
 438          * this project.
 439          *
 440          * @return bool TRUE if this is an in-project interwiki link
 441          *      or a wikilink, FALSE otherwise
 442          * @access public
 443          */
 444         function isLocal() {
 445                 global $wgTitleInterwikiCache, $wgDBname;
 446
 447                 if ( $this->mInterwiki != '' ) {
 448                         # Make sure key is loaded into cache
 449                         $this->getInterwikiLink( $this->mInterwiki );
 450                         $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 451                         return (bool)($wgTitleInterwikiCache[$k]->iw_local);
 452                 } else {
 453                         return true;
 454                 }
 455         }
 456
 457         /**
 458          * Determine whether the object refers to a page within
 459          * this project and is transcludable.
 460          *
 461          * @return bool TRUE if this is transcludable
 462          * @access public
 463          */
 464         function isTrans() {
 465                 global $wgTitleInterwikiCache, $wgDBname;
 466
 467                 if ($this->mInterwiki == '' || !$this->isLocal())
 468                         return false;
 469                 # Make sure key is loaded into cache
 470                 $this->getInterwikiLink( $this->mInterwiki );
 471                 $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 472                 return (bool)($wgTitleInterwikiCache[$k]->iw_trans);
 473         }
 474
 475         /**
 476          * Update the page_touched field for an array of title objects
 477          * @todo Inefficient unless the IDs are already loaded into the
 478          *      link cache
 479          * @param array $titles an array of Title objects to be touched
 480          * @param string $timestamp the timestamp to use instead of the
 481          *      default current time
 482          * @static
 483          * @access public
 484          */
 485         function touchArray( $titles, $timestamp = '' ) {
 486                 global $wgUseFileCache;
 487
 488                 if ( count( $titles ) == 0 ) {
 489                         return;
 490                 }
 491                 $dbw =& wfGetDB( DB_MASTER );
 492                 if ( $timestamp == '' ) {
 493                         $timestamp = $dbw->timestamp();
 494                 }
 495                 $page = $dbw->tableName( 'page' );
 496                 /*
 497                 $sql = "UPDATE $page SET page_touched='{$timestamp}' WHERE page_id IN (";
 498                 $first = true;
 499
 500                 foreach ( $titles as $title ) {
 501                         if ( $wgUseFileCache ) {
 502                                 $cm = new CacheManager($title);
 503                                 @unlink($cm->fileCacheName());
 504                         }
 505
 506                         if ( ! $first ) {
 507                                 $sql .= ',';
 508                         }
 509                         $first = false;
 510                         $sql .= $title->getArticleID();
 511                 }
 512                 $sql .= ')';
 513                 if ( ! $first ) {
 514                         $dbw->query( $sql, 'Title::touchArray' );
 515                 }
 516                 */
 517                 // hack hack hack -- brion 2005-07-11. this was unfriendly to db.
 518                 // do them in small chunks:
 519                 $fname = 'Title::touchArray';
 520                 foreach( $titles as $title ) {
 521                         $dbw->update( 'page',
 522                                 array( 'page_touched' => $timestamp ),
 523                                 array(
 524                                         'page_namespace' => $title->getNamespace(),
 525                                         'page_title'     => $title->getDBkey() ),
 526                                 $fname );
 527                 }
 528         }
 529
 530 #----------------------------------------------------------------------------
 531 #       Other stuff
 532 #----------------------------------------------------------------------------
 533
 534         /** Simple accessors */
 535         /**
 536          * Get the text form (spaces not underscores) of the main part
 537          * @return string
 538          * @access public
 539          */
 540         function getText() { return $this->mTextform; }
 541         /**
 542          * Get the URL-encoded form of the main part
 543          * @return string
 544          * @access public
 545          */
 546         function getPartialURL() { return $this->mUrlform; }
 547         /**
 548          * Get the main part with underscores
 549          * @return string
 550          * @access public
 551          */
 552         function getDBkey() { return $this->mDbkeyform; }
 553         /**
 554          * Get the namespace index, i.e. one of the NS_xxxx constants
 555          * @return int
 556          * @access public
 557          */
 558         function getNamespace() { return $this->mNamespace; }
 559         /**
 560          * Get the namespace text
 561          * @return string
 562          * @access public
 563          */
 564         function getNsText() {
 565                 global $wgContLang;
 566                 return $wgContLang->getNsText( $this->mNamespace );
 567         }
 568         /**
 569          * Get the namespace text of the subject (rather than talk) page
 570          * @return string
 571          * @access public
 572          */
 573         function getSubjectNsText() {
 574                 global $wgContLang;
 575                 return $wgContLang->getNsText( Namespace::getSubject( $this->mNamespace ) );
 576         }
 577
 578         /**
 579          * Get the interwiki prefix (or null string)
 580          * @return string
 581          * @access public
 582          */
 583         function getInterwiki() { return $this->mInterwiki; }
 584         /**
 585          * Get the Title fragment (i.e. the bit after the #)
 586          * @return string
 587          * @access public
 588          */
 589         function getFragment() { return $this->mFragment; }
 590         /**
 591          * Get the default namespace index, for when there is no namespace
 592          * @return int
 593          * @access public
 594          */
 595         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 596
 597         /**
 598          * Get title for search index
 599          * @return string a stripped-down title string ready for the
 600          *      search index
 601          */
 602         function getIndexTitle() {
 603                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 604         }
 605
 606         /**
 607          * Get the prefixed database key form
 608          * @return string the prefixed title, with underscores and
 609          *      any interwiki and namespace prefixes
 610          * @access public
 611          */
 612         function getPrefixedDBkey() {
 613                 $s = $this->prefix( $this->mDbkeyform );
 614                 $s = str_replace( ' ', '_', $s );
 615                 return $s;
 616         }
 617
 618         /**
 619          * Get the prefixed title with spaces.
 620          * This is the form usually used for display
 621          * @return string the prefixed title, with spaces
 622          * @access public
 623          */
 624         function getPrefixedText() {
 625                 global $wgContLang;
 626                 if ( empty( $this->mPrefixedText ) ) {
 627                         $s = $this->prefix( $this->mTextform );
 628                         $s = str_replace( '_', ' ', $s );
 629                         $this->mPrefixedText = $s;
 630                 }
 631                 return $this->mPrefixedText;
 632         }
 633
 634         /**
 635          * Get the prefixed title with spaces, plus any fragment
 636          * (part beginning with '#')
 637          * @return string the prefixed title, with spaces and
 638          *      the fragment, including '#'
 639          * @access public
 640          */
 641         function getFullText() {
 642                 global $wgContLang;
 643                 $text = $this->getPrefixedText();
 644                 if( '' != $this->mFragment ) {
 645                         $text .= '#' . $this->mFragment;
 646                 }
 647                 return $text;
 648         }
 649
 650         /**
 651          * Get a URL-encoded title (not an actual URL) including interwiki
 652          * @return string the URL-encoded form
 653          * @access public
 654          */
 655         function getPrefixedURL() {
 656                 $s = $this->prefix( $this->mDbkeyform );
 657                 $s = str_replace( ' ', '_', $s );
 658
 659                 $s = wfUrlencode ( $s ) ;
 660
 661                 # Cleaning up URL to make it look nice -- is this safe?
 662                 $s = str_replace( '%28', '(', $s );
 663                 $s = str_replace( '%29', ')', $s );
 664
 665                 return $s;
 666         }
 667
 668         /**
 669          * Get a real URL referring to this title, with interwiki link and
 670          * fragment
 671          *
 672          * @param string $query an optional query string, not used
 673          *      for interwiki links
 674          * @return string the URL
 675          * @access public
 676          */
 677         function getFullURL( $query = '' ) {
 678                 global $wgContLang, $wgServer, $wgScript, $wgMakeDumpLinks, $wgArticlePath;
 679
 680                 if ( '' == $this->mInterwiki ) {
 681                         return $wgServer . $this->getLocalUrl( $query );
 682                 } elseif ( $wgMakeDumpLinks && $wgContLang->getLanguageName( $this->mInterwiki ) ) {
 683                         $baseUrl = str_replace( '$1', "../../{$this->mInterwiki}/$1", $wgArticlePath );
 684                         $baseUrl = str_replace( '$1', $this->getHashedDirectory() . '/$1', $baseUrl );
 685                 } else {
 686                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 687                 }
 688
 689                 $namespace = $wgContLang->getNsText( $this->mNamespace );
 690                 if ( '' != $namespace ) {
 691                         # Can this actually happen? Interwikis shouldn't be parsed.
 692                         $namespace .= ':';
 693                 }
 694                 $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 695                 if( $query != '' ) {
 696                         if( false === strpos( $url, '?' ) ) {
 697                                 $url .= '?';
 698                         } else {
 699                                 $url .= '&';
 700                         }
 701                         $url .= $query;
 702                 }
 703                 if ( '' != $this->mFragment ) {
 704                         $url .= '#' . $this->mFragment;
 705                 }
 706                 return $url;
 707         }
 708
 709         /**
 710          * Get a relative directory for putting an HTML version of this article into
 711          */
 712         function getHashedDirectory() {
 713                 global $wgMakeDumpLinks, $wgInputEncoding;
 714                 $dbkey = $this->getDBkey();
 715
 716                 # Split into characters
 717                 if ( $wgInputEncoding == 'UTF-8' ) {
 718                         preg_match_all( '/./us', $dbkey, $m );
 719                 } else {
 720                         preg_match_all( '/./s', $dbkey, $m );
 721                 }
 722                 $chars = $m[0];
 723                 $length = count( $chars );
 724                 $dir = '';
 725
 726                 for ( $i = 0; $i < $wgMakeDumpLinks; $i++ ) {
 727                         if ( $i ) {
 728                                 $dir .= '/';
 729                         }
 730                         if ( $i >= $length ) {
 731                                 $dir .= '_';
 732                         } elseif ( ord( $chars[$i] ) > 32 ) {
 733                                 $dir .= strtolower( $chars[$i] );
 734                         } else {
 735                                 $dir .= sprintf( "%02X", ord( $chars[$i] ) );
 736                         }
 737                 }
 738                 return $dir;
 739         }
 740
 741         function getHashedFilename() {
 742                 $dbkey = $this->getPrefixedDBkey();
 743                 $mainPage = Title::newMainPage();
 744                 if ( $mainPage->getPrefixedDBkey() == $dbkey ) {
 745                         return 'index.html';
 746                 }
 747
 748                 $dir = $this->getHashedDirectory();
 749
 750                 # Replace illegal charcters for Windows paths with underscores
 751                 $friendlyName = strtr( $dbkey, '/\\*?"<>|~', '_________' );
 752
 753                 # Work out lower case form. We assume we're on a system with case-insensitive
 754                 # filenames, so unless the case is of a special form, we have to disambiguate
 755                 $lowerCase = $this->prefix( ucfirst( strtolower( $this->getDBkey() ) ) );
 756
 757                 # Make it mostly unique
 758                 if ( $lowerCase != $friendlyName  ) {
 759                         $friendlyName .= '_' . substr(md5( $dbkey ), 0, 4);
 760                 }
 761                 # Handle colon specially by replacing it with tilde
 762                 # Thus we reduce the number of paths with hashes appended
 763                 $friendlyName = str_replace( ':', '~', $friendlyName );
 764                 return "$dir/$friendlyName.html";
 765         }
 766
 767         /**
 768          * Get a URL with no fragment or server name.  If this page is generated
 769          * with action=render, $wgServer is prepended.
 770          * @param string $query an optional query string; if not specified,
 771          *      $wgArticlePath will be used.
 772          * @return string the URL
 773          * @access public
 774          */
 775         function getLocalURL( $query = '' ) {
 776                 global $wgLang, $wgArticlePath, $wgScript, $wgMakeDumpLinks, $wgServer, $action;
 777
 778                 if ( $this->isExternal() ) {
 779                         return $this->getFullURL();
 780                 }
 781
 782                 $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 783                 if ( $wgMakeDumpLinks ) {
 784                         $url = str_replace( '$1', wfUrlencode( $this->getHashedFilename() ), $wgArticlePath );
 785                 } elseif ( $query == '' ) {
 786                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 787                 } else {
 788                         global $wgActionPaths;
 789                         if( !empty( $wgActionPaths ) &&
 790                                 preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) ) {
 791                                 $action = urldecode( $matches[2] );
 792                                 if( isset( $wgActionPaths[$action] ) ) {
 793                                         $query = $matches[1];
 794                                         if( isset( $matches[4] ) ) $query .= $matches[4];
 795                                         $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 796                                         if( $query != '' ) $url .= '?' . $query;
 797                                         return $url;
 798                                 }
 799                         }
 800                         if ( $query == '-' ) {
 801                                 $query = '';
 802                         }
 803                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 804                 }
 805
 806                 if ($action == 'render')
 807                         return $wgServer . $url;
 808                 else
 809                         return $url;
 810         }
 811
 812         /**
 813          * Get an HTML-escaped version of the URL form, suitable for
 814          * using in a link, without a server name or fragment
 815          * @param string $query an optional query string
 816          * @return string the URL
 817          * @access public
 818          */
 819         function escapeLocalURL( $query = '' ) {
 820                 return htmlspecialchars( $this->getLocalURL( $query ) );
 821         }
 822
 823         /**
 824          * Get an HTML-escaped version of the URL form, suitable for
 825          * using in a link, including the server name and fragment
 826          *
 827          * @return string the URL
 828          * @param string $query an optional query string
 829          * @access public
 830          */
 831         function escapeFullURL( $query = '' ) {
 832                 return htmlspecialchars( $this->getFullURL( $query ) );
 833         }
 834
 835         /**
 836          * Get the URL form for an internal link.
 837          * - Used in various Squid-related code, in case we have a different
 838          * internal hostname for the server from the exposed one.
 839          *
 840          * @param string $query an optional query string
 841          * @return string the URL
 842          * @access public
 843          */
 844         function getInternalURL( $query = '' ) {
 845                 global $wgInternalServer;
 846                 return $wgInternalServer . $this->getLocalURL( $query );
 847         }
 848
 849         /**
 850          * Get the edit URL for this Title
 851          * @return string the URL, or a null string if this is an
 852          *      interwiki link
 853          * @access public
 854          */
 855         function getEditURL() {
 856                 global $wgServer, $wgScript;
 857
 858                 if ( '' != $this->mInterwiki ) { return ''; }
 859                 $s = $this->getLocalURL( 'action=edit' );
 860
 861                 return $s;
 862         }
 863
 864         /**
 865          * Get the HTML-escaped displayable text form.
 866          * Used for the title field in <a> tags.
 867          * @return string the text, including any prefixes
 868          * @access public
 869          */
 870         function getEscapedText() {
 871                 return htmlspecialchars( $this->getPrefixedText() );
 872         }
 873
 874         /**
 875          * Is this Title interwiki?
 876          * @return boolean
 877          * @access public
 878          */
 879         function isExternal() { return ( '' != $this->mInterwiki ); }
 880
 881         /**
 882          * Does the title correspond to a protected article?
 883          * @param string $what the action the page is protected from,
 884          *      by default checks move and edit
 885          * @return boolean
 886          * @access public
 887          */
 888         function isProtected($action = '') {
 889                 if ( -1 == $this->mNamespace ) { return true; }
 890                 if($action == 'edit' || $action == '') {
 891                         $a = $this->getRestrictions("edit");
 892                         if ( in_array( 'sysop', $a ) ) { return true; }
 893                 }
 894                 if($action == 'move' || $action == '') {
 895                         $a = $this->getRestrictions("move");
 896                         if ( in_array( 'sysop', $a ) ) { return true; }
 897                 }
 898                 return false;
 899         }
 900
 901         /**
 902          * Is $wgUser is watching this page?
 903          * @return boolean
 904          * @access public
 905          */
 906         function userIsWatching() {
 907                 global $wgUser;
 908
 909                 if ( is_null( $this->mWatched ) ) {
 910                         if ( -1 == $this->mNamespace || 0 == $wgUser->getID()) {
 911                                 $this->mWatched = false;
 912                         } else {
 913                                 $this->mWatched = $wgUser->isWatched( $this );
 914                         }
 915                 }
 916                 return $this->mWatched;
 917         }
 918
 919         /**
 920          * Is $wgUser perform $action this page?
 921          * @param string $action action that permission needs to be checked for
 922          * @return boolean
 923          * @access private
 924          */
 925         function userCan($action) {
 926                 $fname = 'Title::userCanEdit';
 927                 wfProfileIn( $fname );
 928
 929                 global $wgUser;
 930                 if( NS_SPECIAL == $this->mNamespace ) {
 931                         wfProfileOut( $fname );
 932                         return false;
 933                 }
 934                 if( NS_MEDIAWIKI == $this->mNamespace &&
 935                     !$wgUser->isAllowed('editinterface') ) {
 936                         wfProfileOut( $fname );
 937                         return false;
 938                 }
 939                 if( $this->mDbkeyform == '_' ) {
 940                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
 941                         wfProfileOut( $fname );
 942                         return false;
 943                 }
 944
 945                 # protect global styles and js
 946                 if ( NS_MEDIAWIKI == $this->mNamespace
 947                  && preg_match("/\\.(css|js)$/", $this->mTextform )
 948                      && !$wgUser->isAllowed('editinterface') ) {
 949                         wfProfileOut( $fname );
 950                         return false;
 951                 }
 952
 953                 # protect css/js subpages of user pages
 954                 # XXX: this might be better using restrictions
 955                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
 956                 if( NS_USER == $this->mNamespace
 957                         && preg_match("/\\.(css|js)$/", $this->mTextform )
 958                         && !$wgUser->isAllowed('editinterface')
 959                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
 960                         wfProfileOut( $fname );
 961                         return false;
 962                 }
 963
 964                 foreach( $this->getRestrictions($action) as $right ) {
 965                         // Backwards compatibility, rewrite sysop -> protect
 966                         if ( $right == 'sysop' ) {
 967                                 $right = 'protect';
 968                         }
 969                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
 970                                 wfProfileOut( $fname );
 971                                 return false;
 972                         }
 973                 }
 974
 975                 if( $action == 'move' &&
 976                         !( $this->isMovable() && $wgUser->isAllowed( 'move' ) ) ) {
 977                         wfProfileOut( $fname );
 978                         return false;
 979                 }
 980
 981                 wfProfileOut( $fname );
 982                 return true;
 983         }
 984
 985         /**
 986          * Can $wgUser edit this page?
 987          * @return boolean
 988          * @access public
 989          */
 990         function userCanEdit() {
 991                 return $this->userCan('edit');
 992         }
 993
 994         /**
 995          * Can $wgUser move this page?
 996          * @return boolean
 997          * @access public
 998          */
 999         function userCanMove() {
1000                 return $this->userCan('move');
1001         }
1002
1003         /**
1004          * Would anybody with sufficient privileges be able to move this page?
1005          * Some pages just aren't movable.
1006          *
1007          * @return boolean
1008          * @access public
1009          */
1010         function isMovable() {
1011                 return Namespace::isMovable( $this->getNamespace() )
1012                         && $this->getInterwiki() == '';
1013         }
1014
1015         /**
1016          * Can $wgUser read this page?
1017          * @return boolean
1018          * @access public
1019          */
1020         function userCanRead() {
1021                 global $wgUser;
1022
1023                 if( $wgUser->isAllowed('read') ) {
1024                         return true;
1025                 } else {
1026                         global $wgWhitelistRead;
1027
1028                         /** If anon users can create an account,
1029                             they need to reach the login page first! */
1030                         if( $wgUser->isAllowed( 'createaccount' )
1031                             && $this->getNamespace() == NS_SPECIAL
1032                             && $this->getText() == 'Userlogin' ) {
1033                                 return true;
1034                         }
1035
1036                         /** some pages are explicitly allowed */
1037                         $name = $this->getPrefixedText();
1038                         if( $wgWhitelistRead && in_array( $name, $wgWhitelistRead ) ) {
1039                                 return true;
1040                         }
1041
1042                         # Compatibility with old settings
1043                         if( $wgWhitelistRead && $this->getNamespace() == NS_MAIN ) {
1044                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
1045                                         return true;
1046                                 }
1047                         }
1048                 }
1049                 return false;
1050         }
1051
1052         /**
1053          * Is this a talk page of some sort?
1054          * @return bool
1055          * @access public
1056          */
1057         function isTalkPage() {
1058                 return Namespace::isTalk( $this->getNamespace() );
1059         }
1060
1061         /**
1062          * Is this a .css or .js subpage of a user page?
1063          * @return bool
1064          * @access public
1065          */
1066         function isCssJsSubpage() {
1067                 return ( NS_USER == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
1068         }
1069         /**
1070          * Is this a .css subpage of a user page?
1071          * @return bool
1072          * @access public
1073          */
1074         function isCssSubpage() {
1075                 return ( NS_USER == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
1076         }
1077         /**
1078          * Is this a .js subpage of a user page?
1079          * @return bool
1080          * @access public
1081          */
1082         function isJsSubpage() {
1083                 return ( NS_USER == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
1084         }
1085         /**
1086          * Protect css/js subpages of user pages: can $wgUser edit
1087          * this page?
1088          *
1089          * @return boolean
1090          * @todo XXX: this might be better using restrictions
1091          * @access public
1092          */
1093         function userCanEditCssJsSubpage() {
1094                 global $wgUser;
1095                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1096         }
1097
1098         /**
1099          * Loads a string into mRestrictions array
1100          * @param string $res restrictions in string format
1101          * @access public
1102          */
1103         function loadRestrictions( $res ) {
1104                 foreach( explode( ':', trim( $res ) ) as $restrict ) {
1105                         $temp = explode( '=', trim( $restrict ) );
1106                         if(count($temp) == 1) {
1107                                 // old format should be treated as edit/move restriction
1108                                 $this->mRestrictions["edit"] = explode( ',', trim( $temp[0] ) );
1109                                 $this->mRestrictions["move"] = explode( ',', trim( $temp[0] ) );
1110                         } else {
1111                                 $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1112                         }
1113                 }
1114                 $this->mRestrictionsLoaded = true;
1115         }
1116
1117         /**
1118          * Accessor/initialisation for mRestrictions
1119          * @param string $action action that permission needs to be checked for
1120          * @return array the array of groups allowed to edit this article
1121          * @access public
1122          */
1123         function getRestrictions($action) {
1124                 $id = $this->getArticleID();
1125                 if ( 0 == $id ) { return array(); }
1126
1127                 if ( ! $this->mRestrictionsLoaded ) {
1128                         $dbr =& wfGetDB( DB_SLAVE );
1129                         $res = $dbr->selectField( 'page', 'page_restrictions', 'page_id='.$id );
1130                         $this->loadRestrictions( $res );
1131                 }
1132                 if( isset( $this->mRestrictions[$action] ) ) {
1133                         return $this->mRestrictions[$action];
1134                 }
1135                 return array();
1136         }
1137
1138         /**
1139          * Is there a version of this page in the deletion archive?
1140          * @return int the number of archived revisions
1141          * @access public
1142          */
1143         function isDeleted() {
1144                 $fname = 'Title::isDeleted';
1145                 if ( $this->getNamespace() < 0 ) {
1146                         $n = 0;
1147                 } else {
1148                         $dbr =& wfGetDB( DB_SLAVE );
1149                         $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1150                                 'ar_title' => $this->getDBkey() ), $fname );
1151                 }
1152                 return (int)$n;
1153         }
1154
1155         /**
1156          * Get the article ID for this Title from the link cache,
1157          * adding it if necessary
1158          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1159          *      for update
1160          * @return int the ID
1161          * @access public
1162          */
1163         function getArticleID( $flags = 0 ) {
1164                 global $wgLinkCache;
1165                 if ( $flags & GAID_FOR_UPDATE ) {
1166                         $oldUpdate = $wgLinkCache->forUpdate( true );
1167                         $this->mArticleID = $wgLinkCache->addLinkObj( $this );
1168                         $wgLinkCache->forUpdate( $oldUpdate );
1169                 } else {
1170                         if ( -1 == $this->mArticleID ) {
1171                                 $this->mArticleID = $wgLinkCache->addLinkObj( $this );
1172                         }
1173                 }
1174                 return $this->mArticleID;
1175         }
1176
1177         function getLatestRevID() {
1178                 if ($this->mLatestID !== false)
1179                         return $this->mLatestID;
1180
1181                 $db =& wfGetDB(DB_SLAVE);
1182                 return $this->mLatestID = $db->selectField( 'revision',
1183                         "max(rev_id)",
1184                         array('rev_page' => $this->getArticleID()),
1185                         'Title::getLatestRevID' );
1186         }
1187
1188         /**
1189          * This clears some fields in this object, and clears any associated
1190          * keys in the "bad links" section of $wgLinkCache.
1191          *
1192          * - This is called from Article::insertNewArticle() to allow
1193          * loading of the new page_id. It's also called from
1194          * Article::doDeleteArticle()
1195          *
1196          * @param int $newid the new Article ID
1197          * @access public
1198          */
1199         function resetArticleID( $newid ) {
1200                 global $wgLinkCache;
1201                 $wgLinkCache->clearBadLink( $this->getPrefixedDBkey() );
1202
1203                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1204                 else { $this->mArticleID = $newid; }
1205                 $this->mRestrictionsLoaded = false;
1206                 $this->mRestrictions = array();
1207         }
1208
1209         /**
1210          * Updates page_touched for this page; called from LinksUpdate.php
1211          * @return bool true if the update succeded
1212          * @access public
1213          */
1214         function invalidateCache() {
1215                 global $wgUseFileCache;
1216
1217                 if ( wfReadOnly() ) {
1218                         return;
1219                 }
1220
1221                 $now = wfTimestampNow();
1222                 $dbw =& wfGetDB( DB_MASTER );
1223                 $success = $dbw->update( 'page',
1224                         array( /* SET */
1225                                 'page_touched' => $dbw->timestamp()
1226                         ), array( /* WHERE */
1227                                 'page_namespace' => $this->getNamespace() ,
1228                                 'page_title' => $this->getDBkey()
1229                         ), 'Title::invalidateCache'
1230                 );
1231
1232                 if ($wgUseFileCache) {
1233                         $cache = new CacheManager($this);
1234                         @unlink($cache->fileCacheName());
1235                 }
1236
1237                 return $success;
1238         }
1239
1240         /**
1241          * Prefix some arbitrary text with the namespace or interwiki prefix
1242          * of this object
1243          *
1244          * @param string $name the text
1245          * @return string the prefixed text
1246          * @access private
1247          */
1248         /* private */ function prefix( $name ) {
1249                 global $wgContLang;
1250
1251                 $p = '';
1252                 if ( '' != $this->mInterwiki ) {
1253                         $p = $this->mInterwiki . ':';
1254                 }
1255                 if ( 0 != $this->mNamespace ) {
1256                         $p .= $wgContLang->getNsText( $this->mNamespace ) . ':';
1257                 }
1258                 return $p . $name;
1259         }
1260
1261         /**
1262          * Secure and split - main initialisation function for this object
1263          *
1264          * Assumes that mDbkeyform has been set, and is urldecoded
1265          * and uses underscores, but not otherwise munged.  This function
1266          * removes illegal characters, splits off the interwiki and
1267          * namespace prefixes, sets the other forms, and canonicalizes
1268          * everything.
1269          * @return bool true on success
1270          * @access private
1271          */
1272         /* private */ function secureAndSplit() {
1273                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1274                 $fname = 'Title::secureAndSplit';
1275                 wfProfileIn( $fname );
1276
1277                 # Initialisation
1278                 static $rxTc = false;
1279                 if( !$rxTc ) {
1280                         # % is needed as well
1281                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/S';
1282                 }
1283
1284                 $this->mInterwiki = $this->mFragment = '';
1285                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1286
1287                 # Clean up whitespace
1288                 #
1289                 $t = preg_replace( '/[ _]+/', '_', $this->mDbkeyform );
1290                 $t = trim( $t, '_' );
1291
1292                 if ( '' == $t ) {
1293                         wfProfileOut( $fname );
1294                         return false;
1295                 }
1296
1297                 if( false !== strpos( $t, UTF8_REPLACEMENT ) ) {
1298                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1299                         wfProfileOut( $fname );
1300                         return false;
1301                 }
1302
1303                 $this->mDbkeyform = $t;
1304
1305                 # Initial colon indicates main namespace rather than specified default
1306                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
1307                 if ( ':' == $t{0} ) {
1308                         $this->mNamespace = NS_MAIN;
1309                         $t = substr( $t, 1 ); # remove the colon but continue processing
1310                 }
1311
1312                 # Namespace or interwiki prefix
1313                 $firstPass = true;
1314                 do {
1315                         if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $t, $m ) ) {
1316                                 $p = $m[1];
1317                                 $lowerNs = strtolower( $p );
1318                                 if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1319                                         # Canonical namespace
1320                                         $t = $m[2];
1321                                         $this->mNamespace = $ns;
1322                                 } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1323                                         # Ordinary namespace
1324                                         $t = $m[2];
1325                                         $this->mNamespace = $ns;
1326                                 } elseif( $this->getInterwikiLink( $p ) ) {
1327                                         if( !$firstPass ) {
1328                                                 # Can't make a local interwiki link to an interwiki link.
1329                                                 # That's just crazy!
1330                                                 wfProfileOut( $fname );
1331                                                 return false;
1332                                         }
1333
1334                                         # Interwiki link
1335                                         $t = $m[2];
1336                                         $this->mInterwiki = $p;
1337
1338                                         # Redundant interwiki prefix to the local wiki
1339                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1340                                                 if( $t == '' ) {
1341                                                         # Can't have an empty self-link
1342                                                         wfProfileOut( $fname );
1343                                                         return false;
1344                                                 }
1345                                                 $this->mInterwiki = '';
1346                                                 $firstPass = false;
1347                                                 # Do another namespace split...
1348                                                 continue;
1349                                         }
1350                                 }
1351                                 # If there's no recognized interwiki or namespace,
1352                                 # then let the colon expression be part of the title.
1353                         }
1354                         break;
1355                 } while( true );
1356                 $r = $t;
1357
1358                 # We already know that some pages won't be in the database!
1359                 #
1360                 if ( '' != $this->mInterwiki || -1 == $this->mNamespace ) {
1361                         $this->mArticleID = 0;
1362                 }
1363                 $f = strstr( $r, '#' );
1364                 if ( false !== $f ) {
1365                         $this->mFragment = substr( $f, 1 );
1366                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
1367                         # remove whitespace again: prevents "Foo_bar_#"
1368                         # becoming "Foo_bar_"
1369                         $r = preg_replace( '/_*$/', '', $r );
1370                 }
1371
1372                 # Reject illegal characters.
1373                 #
1374                 if( preg_match( $rxTc, $r ) ) {
1375                         wfProfileOut( $fname );
1376                         return false;
1377                 }
1378
1379                 /**
1380                  * Pages with "/./" or "/../" appearing in the URLs will
1381                  * often be unreachable due to the way web browsers deal
1382                  * with 'relative' URLs. Forbid them explicitly.
1383                  */
1384                 if ( strpos( $r, '.' ) !== false &&
1385                      ( $r === '.' || $r === '..' ||
1386                        strpos( $r, './' ) === 0  ||
1387                        strpos( $r, '../' ) === 0 ||
1388                        strpos( $r, '/./' ) !== false ||
1389                        strpos( $r, '/../' ) !== false ) )
1390                 {
1391                         wfProfileOut( $fname );
1392                         return false;
1393                 }
1394
1395                 # We shouldn't need to query the DB for the size.
1396                 #$maxSize = $dbr->textFieldSize( 'page', 'page_title' );
1397                 if ( strlen( $r ) > 255 ) {
1398                         wfProfileOut( $fname );
1399                         return false;
1400                 }
1401
1402                 /**
1403                  * Normally, all wiki links are forced to have
1404                  * an initial capital letter so [[foo]] and [[Foo]]
1405                  * point to the same place.
1406                  *
1407                  * Don't force it for interwikis, since the other
1408                  * site might be case-sensitive.
1409                  */
1410                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1411                         $t = $wgContLang->ucfirst( $r );
1412                 } else {
1413                         $t = $r;
1414                 }
1415
1416                 /**
1417                  * Can't make a link to a namespace alone...
1418                  * "empty" local links can only be self-links
1419                  * with a fragment identifier.
1420                  */
1421                 if( $t == '' &&
1422                         $this->mInterwiki == '' &&
1423                         $this->mNamespace != NS_MAIN ) {
1424                         wfProfileOut( $fname );
1425                         return false;
1426                 }
1427
1428                 # Fill fields
1429                 $this->mDbkeyform = $t;
1430                 $this->mUrlform = wfUrlencode( $t );
1431
1432                 $this->mTextform = str_replace( '_', ' ', $t );
1433
1434                 wfProfileOut( $fname );
1435                 return true;
1436         }
1437
1438         /**
1439          * Get a Title object associated with the talk page of this article
1440          * @return Title the object for the talk page
1441          * @access public
1442          */
1443         function getTalkPage() {
1444                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1445         }
1446
1447         /**
1448          * Get a title object associated with the subject page of this
1449          * talk page
1450          *
1451          * @return Title the object for the subject page
1452          * @access public
1453          */
1454         function getSubjectPage() {
1455                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1456         }
1457
1458         /**
1459          * Get an array of Title objects linking to this Title
1460          * Also stores the IDs in the link cache.
1461          *
1462          * @param string $options may be FOR UPDATE
1463          * @return array the Title objects linking here
1464          * @access public
1465          */
1466         function getLinksTo( $options = '' ) {
1467                 global $wgLinkCache;
1468                 $id = $this->getArticleID();
1469
1470                 if ( $options ) {
1471                         $db =& wfGetDB( DB_MASTER );
1472                 } else {
1473                         $db =& wfGetDB( DB_SLAVE );
1474                 }
1475
1476                 $res = $db->select( array( 'page', 'pagelinks' ),
1477                         array( 'page_namespace', 'page_title', 'page_id' ),
1478                         array(
1479                                 'pl_from=page_id',
1480                                 'pl_namespace' => $this->getNamespace(),
1481                                 'pl_title'     => $this->getDbKey() ),
1482                         'Title::getLinksTo',
1483                         $options );
1484
1485                 $retVal = array();
1486                 if ( $db->numRows( $res ) ) {
1487                         while ( $row = $db->fetchObject( $res ) ) {
1488                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1489                                         $wgLinkCache->addGoodLinkObj( $row->page_id, $titleObj );
1490                                         $retVal[] = $titleObj;
1491                                 }
1492                         }
1493                 }
1494                 $db->freeResult( $res );
1495                 return $retVal;
1496         }
1497
1498         /**
1499          * Get an array of Title objects referring to non-existent articles linked from this page
1500          *
1501          * @param string $options may be FOR UPDATE
1502          * @return array the Title objects
1503          * @access public
1504          */
1505         function getBrokenLinksFrom( $options = '' ) {
1506                 global $wgLinkCache;
1507
1508                 if ( $options ) {
1509                         $db =& wfGetDB( DB_MASTER );
1510                 } else {
1511                         $db =& wfGetDB( DB_SLAVE );
1512                 }
1513
1514                 $res = $db->safeQuery(
1515                           "SELECT pl_namespace, pl_title
1516                              FROM !
1517                         LEFT JOIN !
1518                                ON pl_namespace=page_namespace
1519                               AND pl_title=page_title
1520                             WHERE pl_from=?
1521                               AND page_namespace IS NULL
1522                                   !",
1523                         $db->tableName( 'pagelinks' ),
1524                         $db->tableName( 'page' ),
1525                         $this->getArticleId(),
1526                         $options );
1527
1528                 $retVal = array();
1529                 if ( $db->numRows( $res ) ) {
1530                         while ( $row = $db->fetchObject( $res ) ) {
1531                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
1532                         }
1533                 }
1534                 $db->freeResult( $res );
1535                 return $retVal;
1536         }
1537
1538
1539         /**
1540          * Get a list of URLs to purge from the Squid cache when this
1541          * page changes
1542          *
1543          * @return array the URLs
1544          * @access public
1545          */
1546         function getSquidURLs() {
1547                 return array(
1548                         $this->getInternalURL(),
1549                         $this->getInternalURL( 'action=history' )
1550                 );
1551         }
1552
1553         /**
1554          * Move this page without authentication
1555          * @param Title &$nt the new page Title
1556          * @access public
1557          */
1558         function moveNoAuth( &$nt ) {
1559                 return $this->moveTo( $nt, false );
1560         }
1561
1562         /**
1563          * Check whether a given move operation would be valid.
1564          * Returns true if ok, or a message key string for an error message
1565          * if invalid. (Scarrrrry ugly interface this.)
1566          * @param Title &$nt the new title
1567          * @param bool $auth indicates whether $wgUser's permissions
1568          *      should be checked
1569          * @return mixed true on success, message name on failure
1570          * @access public
1571          */
1572         function isValidMoveOperation( &$nt, $auth = true, $reason = '' ) {
1573                 global $wgUser;
1574                 if( !$this or !$nt ) {
1575                         return 'badtitletext';
1576                 }
1577                 if( $this->equals( $nt ) ) {
1578                         return 'selfmove';
1579                 }
1580                 if( !$this->isMovable() || !$nt->isMovable() ) {
1581                         return 'immobile_namespace';
1582                 }
1583
1584                 $fname = 'Title::move';
1585                 $oldid = $this->getArticleID();
1586                 $newid = $nt->getArticleID();
1587
1588                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1589                         return 'articleexists';
1590                 }
1591                 if ( ( '' == $this->getDBkey() ) ||
1592                          ( !$oldid ) ||
1593                      ( '' == $nt->getDBkey() ) ) {
1594                         return 'badarticleerror';
1595                 }
1596
1597                 if ( $auth && (
1598                                 !$this->userCanEdit() || !$nt->userCanEdit() ||
1599                                 !$this->userCanMove() || !$nt->userCanMove() ) ) {
1600                         return 'protectedpage';
1601                 }
1602
1603                 # The move is allowed only if (1) the target doesn't exist, or
1604                 # (2) the target is a redirect to the source, and has no history
1605                 # (so we can undo bad moves right after they're done).
1606
1607                 if ( 0 != $newid ) { # Target exists; check for validity
1608                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1609                                 return 'articleexists';
1610                         }
1611                 }
1612                 return true;
1613         }
1614
1615         /**
1616          * Move a title to a new location
1617          * @param Title &$nt the new title
1618          * @param bool $auth indicates whether $wgUser's permissions
1619          *      should be checked
1620          * @return mixed true on success, message name on failure
1621          * @access public
1622          */
1623         function moveTo( &$nt, $auth = true, $reason = '' ) {
1624                 $err = $this->isValidMoveOperation( $nt, $auth, $reason );
1625                 if( is_string( $err ) ) {
1626                         return $err;
1627                 }
1628
1629                 $pageid = $this->getArticleID();
1630                 if( $nt->exists() ) {
1631                         $this->moveOverExistingRedirect( $nt, $reason );
1632                         $pageCountChange = 0;
1633                 } else { # Target didn't exist, do normal move.
1634                         $this->moveToNewTitle( $nt, $newid, $reason );
1635                         $pageCountChange = 1;
1636                 }
1637                 $redirid = $this->getArticleID();
1638
1639                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
1640                 $dbw =& wfGetDB( DB_MASTER );
1641                 $categorylinks = $dbw->tableName( 'categorylinks' );
1642                 $sql = "UPDATE $categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
1643                         " WHERE cl_from=" . $dbw->addQuotes( $pageid ) .
1644                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
1645                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
1646
1647                 # Update watchlists
1648
1649                 $oldnamespace = $this->getNamespace() & ~1;
1650                 $newnamespace = $nt->getNamespace() & ~1;
1651                 $oldtitle = $this->getDBkey();
1652                 $newtitle = $nt->getDBkey();
1653
1654                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
1655                         WatchedItem::duplicateEntries( $this, $nt );
1656                 }
1657
1658                 # Update search engine
1659                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
1660                 $u->doUpdate();
1661                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
1662                 $u->doUpdate();
1663
1664                 # Update site_stats
1665                 if ( $this->getNamespace() == NS_MAIN and $nt->getNamespace() != NS_MAIN ) {
1666                         # Moved out of main namespace
1667                         # not viewed, edited, removing
1668                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange);
1669                 } elseif ( $this->getNamespace() != NS_MAIN and $nt->getNamespace() == NS_MAIN ) {
1670                         # Moved into main namespace
1671                         # not viewed, edited, adding
1672                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
1673                 } elseif ( $pageCountChange ) {
1674                         # Added redirect
1675                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
1676                 } else{
1677                         $u = false;
1678                 }
1679                 if ( $u ) {
1680                         $u->doUpdate();
1681                 }
1682
1683                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
1684                 return true;
1685         }
1686
1687         /**
1688          * Move page to a title which is at present a redirect to the
1689          * source page
1690          *
1691          * @param Title &$nt the page to move to, which should currently
1692          *      be a redirect
1693          * @access private
1694          */
1695         function moveOverExistingRedirect( &$nt, $reason = '' ) {
1696                 global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
1697                 $fname = 'Title::moveOverExistingRedirect';
1698                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1699
1700                 if ( $reason ) {
1701                         $comment .= ": $reason";
1702                 }
1703
1704                 $now = wfTimestampNow();
1705                 $rand = wfRandom();
1706                 $newid = $nt->getArticleID();
1707                 $oldid = $this->getArticleID();
1708                 $dbw =& wfGetDB( DB_MASTER );
1709                 $links = $dbw->tableName( 'links' );
1710
1711                 # Delete the old redirect. We don't save it to history since
1712                 # by definition if we've got here it's rather uninteresting.
1713                 # We have to remove it so that the next step doesn't trigger
1714                 # a conflict on the unique namespace+title index...
1715                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
1716
1717                 # Save a null revision in the page's history notifying of the move
1718                 $nullRevision = Revision::newNullRevision( $dbw, $oldid,
1719                         wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() ),
1720                         true );
1721                 $nullRevId = $nullRevision->insertOn( $dbw );
1722
1723                 # Change the name of the target page:
1724                 $dbw->update( 'page',
1725                         /* SET */ array(
1726                                 'page_touched'   => $dbw->timestamp($now),
1727                                 'page_namespace' => $nt->getNamespace(),
1728                                 'page_title'     => $nt->getDBkey(),
1729                                 'page_latest'    => $nullRevId,
1730                         ),
1731                         /* WHERE */ array( 'page_id' => $oldid ),
1732                         $fname
1733                 );
1734                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1735
1736                 # Recreate the redirect, this time in the other direction.
1737                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1738                 $redirectArticle = new Article( $this );
1739                 $newid = $redirectArticle->insertOn( $dbw );
1740                 $redirectRevision = new Revision( array(
1741                         'page'    => $newid,
1742                         'comment' => $comment,
1743                         'text'    => $redirectText ) );
1744                 $revid = $redirectRevision->insertOn( $dbw );
1745                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1746                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1747
1748                 # Log the move
1749                 $log = new LogPage( 'move' );
1750                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
1751
1752                 # Now, we record the link from the redirect to the new title.
1753                 # It should have no other outgoing links...
1754                 $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
1755                 $dbw->insert( 'pagelinks',
1756                         array(
1757                                 'pl_from'      => $newid,
1758                                 'pl_namespace' => $nt->getNamespace(),
1759                                 'pl_title'     => $nt->getDbKey() ),
1760                         $fname );
1761
1762                 # Purge squid
1763                 if ( $wgUseSquid ) {
1764                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1765                         $u = new SquidUpdate( $urls );
1766                         $u->doUpdate();
1767                 }
1768         }
1769
1770         /**
1771          * Move page to non-existing title.
1772          * @param Title &$nt the new Title
1773          * @param int &$newid set to be the new article ID
1774          * @access private
1775          */
1776         function moveToNewTitle( &$nt, &$newid, $reason = '' ) {
1777                 global $wgUser, $wgLinkCache, $wgUseSquid;
1778                 global $wgMwRedir;
1779                 $fname = 'MovePageForm::moveToNewTitle';
1780                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1781                 if ( $reason ) {
1782                         $comment .= ": $reason";
1783                 }
1784
1785                 $newid = $nt->getArticleID();
1786                 $oldid = $this->getArticleID();
1787                 $dbw =& wfGetDB( DB_MASTER );
1788                 $now = $dbw->timestamp();
1789                 wfSeedRandom();
1790                 $rand = wfRandom();
1791
1792                 # Save a null revision in the page's history notifying of the move
1793                 $nullRevision = Revision::newNullRevision( $dbw, $oldid,
1794                         wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() ),
1795                         true );
1796                 $nullRevId = $nullRevision->insertOn( $dbw );
1797
1798                 # Rename cur entry
1799                 $dbw->update( 'page',
1800                         /* SET */ array(
1801                                 'page_touched'   => $now,
1802                                 'page_namespace' => $nt->getNamespace(),
1803                                 'page_title'     => $nt->getDBkey(),
1804                                 'page_latest'    => $nullRevId,
1805                         ),
1806                         /* WHERE */ array( 'page_id' => $oldid ),
1807                         $fname
1808                 );
1809
1810                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1811
1812                 # Insert redirect
1813                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1814                 $redirectArticle = new Article( $this );
1815                 $newid = $redirectArticle->insertOn( $dbw );
1816                 $redirectRevision = new Revision( array(
1817                         'page'    => $newid,
1818                         'comment' => $comment,
1819                         'text'    => $redirectText ) );
1820                 $revid = $redirectRevision->insertOn( $dbw );
1821                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1822                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1823
1824                 # Log the move
1825                 $log = new LogPage( 'move' );
1826                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
1827
1828                 # Purge caches as per article creation
1829                 Article::onArticleCreate( $nt );
1830
1831                 # Record the just-created redirect's linking to the page
1832                 $dbw->insert( 'pagelinks',
1833                         array(
1834                                 'pl_from'      => $newid,
1835                                 'pl_namespace' => $nt->getNamespace(),
1836                                 'pl_title'     => $nt->getDBkey() ),
1837                         $fname );
1838
1839                 # Non-existent target may have had broken links to it; these must
1840                 # now be touched to update link coloring.
1841                 $nt->touchLinks();
1842
1843                 # Purge old title from squid
1844                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1845                 $titles = $nt->getLinksTo();
1846                 if ( $wgUseSquid ) {
1847                         $urls = $this->getSquidURLs();
1848                         foreach ( $titles as $linkTitle ) {
1849                                 $urls[] = $linkTitle->getInternalURL();
1850                         }
1851                         $u = new SquidUpdate( $urls );
1852                         $u->doUpdate();
1853                 }
1854         }
1855
1856         /**
1857          * Checks if $this can be moved to a given Title
1858          * - Selects for update, so don't call it unless you mean business
1859          *
1860          * @param Title &$nt the new title to check
1861          * @access public
1862          */
1863         function isValidMoveTarget( $nt ) {
1864
1865                 $fname = 'Title::isValidMoveTarget';
1866                 $dbw =& wfGetDB( DB_MASTER );
1867
1868                 # Is it a redirect?
1869                 $id  = $nt->getArticleID();
1870                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
1871                         array( 'page_is_redirect','old_text','old_flags' ),
1872                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
1873                         $fname, 'FOR UPDATE' );
1874
1875                 if ( !$obj || 0 == $obj->page_is_redirect ) {
1876                         # Not a redirect
1877                         return false;
1878                 }
1879                 $text = Revision::getRevisionText( $obj );
1880
1881                 # Does the redirect point to the source?
1882                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
1883                         $redirTitle = Title::newFromText( $m[1] );
1884                         if( !is_object( $redirTitle ) ||
1885                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1886                                 return false;
1887                         }
1888                 } else {
1889                         # Fail safe
1890                         return false;
1891                 }
1892
1893                 # Does the article have a history?
1894                 $row = $dbw->selectRow( array( 'page', 'revision'),
1895                         array( 'rev_id' ),
1896                         array( 'page_namespace' => $nt->getNamespace(),
1897                                 'page_title' => $nt->getDBkey(),
1898                                 'page_id=rev_page AND page_latest != rev_id'
1899                         ), $fname, 'FOR UPDATE'
1900                 );
1901
1902                 # Return true if there was no history
1903                 return $row === false;
1904         }
1905
1906         /**
1907          * Create a redirect; fails if the title already exists; does
1908          * not notify RC
1909          *
1910          * @param Title $dest the destination of the redirect
1911          * @param string $comment the comment string describing the move
1912          * @return bool true on success
1913          * @access public
1914          */
1915         function createRedirect( $dest, $comment ) {
1916                 global $wgUser;
1917                 if ( $this->getArticleID() ) {
1918                         return false;
1919                 }
1920
1921                 $fname = 'Title::createRedirect';
1922                 $dbw =& wfGetDB( DB_MASTER );
1923
1924                 $article = new Article( $this );
1925                 $newid = $article->insertOn( $dbw );
1926                 $revision = new Revision( array(
1927                         'page'      => $newid,
1928                         'comment'   => $comment,
1929                         'text'      => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n",
1930                         ) );
1931                 $revisionId = $revision->insertOn( $dbw );
1932                 $article->updateRevisionOn( $dbw, $revision, 0 );
1933
1934                 # Link table
1935                 $dbw->insert( 'pagelinks',
1936                         array(
1937                                 'pl_from'      => $newid,
1938                                 'pl_namespace' => $dest->getNamespace(),
1939                                 'pl_title'     => $dest->getDbKey()
1940                         ), $fname
1941                 );
1942
1943                 Article::onArticleCreate( $this );
1944                 return true;
1945         }
1946
1947         /**
1948          * Get categories to which this Title belongs and return an array of
1949          * categories' names.
1950          *
1951          * @return array an array of parents in the form:
1952          *      $parent => $currentarticle
1953          * @access public
1954          */
1955         function getParentCategories() {
1956                 global $wgContLang,$wgUser;
1957
1958                 $titlekey = $this->getArticleId();
1959                 $sk =& $wgUser->getSkin();
1960                 $parents = array();
1961                 $dbr =& wfGetDB( DB_SLAVE );
1962                 $categorylinks = $dbr->tableName( 'categorylinks' );
1963
1964                 # NEW SQL
1965                 $sql = "SELECT * FROM $categorylinks"
1966                      ." WHERE cl_from='$titlekey'"
1967                          ." AND cl_from <> '0'"
1968                          ." ORDER BY cl_sortkey";
1969
1970                 $res = $dbr->query ( $sql ) ;
1971
1972                 if($dbr->numRows($res) > 0) {
1973                         while ( $x = $dbr->fetchObject ( $res ) )
1974                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
1975                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
1976                         $dbr->freeResult ( $res ) ;
1977                 } else {
1978                         $data = '';
1979                 }
1980                 return $data;
1981         }
1982
1983         /**
1984          * Get a tree of parent categories
1985          * @param array $children an array with the children in the keys, to check for circular refs
1986          * @return array
1987          * @access public
1988          */
1989         function getParentCategoryTree( $children = array() ) {
1990                 $parents = $this->getParentCategories();
1991
1992                 if($parents != '') {
1993                         foreach($parents as $parent => $current)
1994                         {
1995                                 if ( array_key_exists( $parent, $children ) ) {
1996                                         # Circular reference
1997                                         $stack[$parent] = array();
1998                                 } else {
1999                                         $nt = Title::newFromText($parent);
2000                                         $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
2001                                 }
2002                         }
2003                         return $stack;
2004                 } else {
2005                         return array();
2006                 }
2007         }
2008
2009
2010         /**
2011          * Get an associative array for selecting this title from
2012          * the "cur" table
2013          *
2014          * @return array
2015          * @access public
2016          */
2017         function curCond() {
2018                 wfDebugDieBacktrace( 'curCond called' );
2019                 return array( 'cur_namespace' => $this->mNamespace, 'cur_title' => $this->mDbkeyform );
2020         }
2021
2022         /**
2023          * Get an associative array for selecting this title from the
2024          * "old" table
2025          *
2026          * @return array
2027          * @access public
2028          */
2029         function oldCond() {
2030                 wfDebugDieBacktrace( 'oldCond called' );
2031                 return array( 'old_namespace' => $this->mNamespace, 'old_title' => $this->mDbkeyform );
2032         }
2033
2034         /**
2035          * Get the revision ID of the previous revision
2036          *
2037          * @param integer $revision  Revision ID. Get the revision that was before this one.
2038          * @return interger $oldrevision|false
2039          */
2040         function getPreviousRevisionID( $revision ) {
2041                 $dbr =& wfGetDB( DB_SLAVE );
2042                 return $dbr->selectField( 'revision', 'rev_id',
2043                         'rev_page=' . intval( $this->getArticleId() ) .
2044                         ' AND rev_id<' . intval( $revision ) . ' ORDER BY rev_id DESC' );
2045         }
2046
2047         /**
2048          * Get the revision ID of the next revision
2049          *
2050          * @param integer $revision  Revision ID. Get the revision that was after this one.
2051          * @return interger $oldrevision|false
2052          */
2053         function getNextRevisionID( $revision ) {
2054                 $dbr =& wfGetDB( DB_SLAVE );
2055                 return $dbr->selectField( 'revision', 'rev_id',
2056                         'rev_page=' . intval( $this->getArticleId() ) .
2057                         ' AND rev_id>' . intval( $revision ) . ' ORDER BY rev_id' );
2058         }
2059
2060         /**
2061          * Compare with another title.
2062          *
2063          * @param Title $title
2064          * @return bool
2065          */
2066         function equals( &$title ) {
2067                 return $this->getInterwiki() == $title->getInterwiki()
2068                         && $this->getNamespace() == $title->getNamespace()
2069                         && $this->getDbkey() == $title->getDbkey();
2070         }
2071
2072         /**
2073          * Check if page exists
2074          * @return bool
2075          */
2076         function exists() {
2077                 return $this->getArticleId() != 0;
2078         }
2079
2080         /**
2081          * Should a link should be displayed as a known link, just based on its title?
2082          *
2083          * Currently, a self-link with a fragment, special pages and image pages are in
2084          * this category. Special pages never exist in the database. Some images do not
2085          * have description pages in the database, but the description page contains
2086          * useful history information that the user may want to link to.
2087          */
2088         function isAlwaysKnown() {
2089                 return  $this->isExternal() || ( 0 == $this->mNamespace && "" == $this->mDbkeyform )
2090                   || NS_SPECIAL == $this->mNamespace || NS_IMAGE == $this->mNamespace;
2091         }
2092
2093         /**
2094          * Update page_touched timestamps on pages linking to this title.
2095          * In principal, this could be backgrounded and could also do squid
2096          * purging.
2097          */
2098         function touchLinks() {
2099                 $fname = 'Title::touchLinks';
2100
2101                 $dbw =& wfGetDB( DB_MASTER );
2102
2103                 $res = $dbw->select( 'pagelinks',
2104                         array( 'pl_from' ),
2105                         array(
2106                                 'pl_namespace' => $this->getNamespace(),
2107                                 'pl_title'     => $this->getDbKey() ),
2108                         $fname );
2109                 if ( 0 == $dbw->numRows( $res ) ) {
2110                         return;
2111                 }
2112
2113                 $arr = array();
2114                 $toucharr = array();
2115                 while( $row = $dbw->fetchObject( $res ) ) {
2116                         $toucharr[] = $row->pl_from;
2117                 }
2118                 if (!count($toucharr))
2119                         return;
2120                 $dbw->update( 'page', /* SET */ array( 'page_touched' => $dbw->timestamp() ),
2121                                                         /* WHERE */ array( 'page_id' => $toucharr ),$fname);
2122         }
2123
2124         function trackbackURL() {
2125                 global $wgTitle, $wgScriptPath, $wgServer;
2126
2127                 return "$wgServer$wgScriptPath/trackback.php?article="
2128                         . htmlspecialchars(urlencode($wgTitle->getPrefixedDBkey()));
2129         }
2130
2131         function trackbackRDF() {
2132                 $url = htmlspecialchars($this->getFullURL());
2133                 $title = htmlspecialchars($this->getText());
2134                 $tburl = $this->trackbackURL();
2135
2136                 return "
2137 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
2138          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
2139          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
2140 <rdf:Description
2141    rdf:about=\"$url\"
2142    dc:identifier=\"$url\"
2143    dc:title=\"$title\"
2144    trackback:ping=\"$tburl\" />
2145 </rdf:RDF>";
2146         }
2147 }
2148 ?>