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 $wgTitleCache = array();
  13
  14 define ( 'GAID_FOR_UPDATE', 1 );
  15
  16 # Title::newFromTitle maintains a cache to avoid
  17 # expensive re-normalization of commonly used titles.
  18 # On a batch operation this can become a memory leak
  19 # if not bounded. After hitting this many titles,
  20 # reset the cache.
  21 define( 'MW_TITLECACHE_MAX', 1000 );
  22
  23 /**
  24  * Title class
  25  * - Represents a title, which may contain an interwiki designation or namespace
  26  * - Can fetch various kinds of data from the database, albeit inefficiently.
  27  *
  28  * @package MediaWiki
  29  */
  30 class Title {
  31         /**
  32          * All member variables should be considered private
  33          * Please use the accessor functions
  34          */
  35
  36          /**#@+
  37          * @access private
  38          */
  39
  40         var $mTextform;           # Text form (spaces not underscores) of the main part
  41         var $mUrlform;            # URL-encoded form of the main part
  42         var $mDbkeyform;          # Main part with underscores
  43         var $mNamespace;          # Namespace index, i.e. one of the NS_xxxx constants
  44         var $mInterwiki;          # Interwiki prefix (or null string)
  45         var $mFragment;           # Title fragment (i.e. the bit after the #)
  46         var $mArticleID;          # Article ID, fetched from the link cache on demand
  47         var $mLatestID;         # ID of most recent revision
  48         var $mRestrictions;       # Array of groups allowed to edit this article
  49                               # Only null or "sysop" are supported
  50         var $mRestrictionsLoaded; # Boolean for initialisation on demand
  51         var $mPrefixedText;       # Text form including namespace/interwiki, initialised on demand
  52         var $mDefaultNamespace;   # Namespace index when there is no namespace
  53                               # Zero except in {{transclusion}} tags
  54         var $mWatched;            # Is $wgUser watching this page? NULL if unfilled, accessed through userIsWatching()
  55         /**#@-*/
  56
  57
  58         /**
  59          * Constructor
  60          * @access private
  61          */
  62         /* private */ function Title() {
  63                 $this->mInterwiki = $this->mUrlform =
  64                 $this->mTextform = $this->mDbkeyform = '';
  65                 $this->mArticleID = -1;
  66                 $this->mNamespace = NS_MAIN;
  67                 $this->mRestrictionsLoaded = false;
  68                 $this->mRestrictions = array();
  69                 # Dont change the following, NS_MAIN is hardcoded in several place
  70                 # See bug #696
  71                 $this->mDefaultNamespace = NS_MAIN;
  72                 $this->mWatched = NULL;
  73                 $this->mLatestID = false;
  74         }
  75
  76         /**
  77          * Create a new Title from a prefixed DB key
  78          * @param string $key The database key, which has underscores
  79          *      instead of spaces, possibly including namespace and
  80          *      interwiki prefixes
  81          * @return Title the new object, or NULL on an error
  82          * @static
  83          * @access public
  84          */
  85         /* static */ function newFromDBkey( $key ) {
  86                 $t = new Title();
  87                 $t->mDbkeyform = $key;
  88                 if( $t->secureAndSplit() )
  89                         return $t;
  90                 else
  91                         return NULL;
  92         }
  93
  94         /**
  95          * Create a new Title from text, such as what one would
  96          * find in a link. Decodes any HTML entities in the text.
  97          *
  98          * @param string $text the link text; spaces, prefixes,
  99          *      and an initial ':' indicating the main namespace
 100          *      are accepted
 101          * @param int $defaultNamespace the namespace to use if
 102          *      none is specified by a prefix
 103          * @return Title the new object, or NULL on an error
 104          * @static
 105          * @access public
 106          */
 107         function newFromText( $text, $defaultNamespace = NS_MAIN ) {
 108                 global $wgTitleCache;
 109                 $fname = 'Title::newFromText';
 110
 111                 if( is_object( $text ) ) {
 112                         wfDebugDieBacktrace( 'Title::newFromText given an object' );
 113                 }
 114
 115                 /**
 116                  * Wiki pages often contain multiple links to the same page.
 117                  * Title normalization and parsing can become expensive on
 118                  * pages with many links, so we can save a little time by
 119                  * caching them.
 120                  *
 121                  * In theory these are value objects and won't get changed...
 122                  */
 123                 if( $defaultNamespace == NS_MAIN && isset( $wgTitleCache[$text] ) ) {
 124                         return $wgTitleCache[$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                 static $cachedcount = 0 ;
 137                 if( $t->secureAndSplit() ) {
 138                         if( $defaultNamespace == NS_MAIN ) {
 139                                 if( $cachedcount >= MW_TITLECACHE_MAX ) {
 140                                         # Avoid memory leaks on mass operations...
 141                                         $wgTitleCache = array();
 142                                         $cachedcount=0;
 143                                 }
 144                                 $cachedcount++;
 145                                 $wgTitleCache[$text] =& $t;
 146                         }
 147                         return $t;
 148                 } else {
 149                         $ret = NULL;
 150                         return $ret;
 151                 }
 152         }
 153
 154         /**
 155          * Create a new Title from URL-encoded text. Ensures that
 156          * the given title's length does not exceed the maximum.
 157          * @param string $url the title, as might be taken from a URL
 158          * @return Title the new object, or NULL on an error
 159          * @static
 160          * @access public
 161          */
 162         function newFromURL( $url ) {
 163                 global $wgLegalTitleChars;
 164                 $t = new Title();
 165
 166                 # For compatibility with old buggy URLs. "+" is usually not valid in titles,
 167                 # but some URLs used it as a space replacement and they still come
 168                 # from some external search tools.
 169                 if ( strpos( $wgLegalTitleChars, '+' ) === false ) {
 170                         $url = str_replace( '+', ' ', $url );
 171                 }
 172
 173                 $t->mDbkeyform = str_replace( ' ', '_', $url );
 174                 if( $t->secureAndSplit() ) {
 175                         return $t;
 176                 } else {
 177                         return NULL;
 178                 }
 179         }
 180
 181         /**
 182          * Create a new Title from an article ID
 183          *
 184          * @todo This is inefficiently implemented, the page row is requested
 185          *       but not used for anything else
 186          *
 187          * @param int $id the page_id corresponding to the Title to create
 188          * @return Title the new object, or NULL on an error
 189          * @access public
 190          * @static
 191          */
 192         function newFromID( $id ) {
 193                 $fname = 'Title::newFromID';
 194                 $dbr =& wfGetDB( DB_SLAVE );
 195                 $row = $dbr->selectRow( 'page', array( 'page_namespace', 'page_title' ),
 196                         array( 'page_id' => $id ), $fname );
 197                 if ( $row !== false ) {
 198                         $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 199                 } else {
 200                         $title = NULL;
 201                 }
 202                 return $title;
 203         }
 204
 205         /**
 206          * Create a new Title from a namespace index and a DB key.
 207          * It's assumed that $ns and $title are *valid*, for instance when
 208          * they came directly from the database or a special page name.
 209          * For convenience, spaces are converted to underscores so that
 210          * eg user_text fields can be used directly.
 211          *
 212          * @param int $ns the namespace of the article
 213          * @param string $title the unprefixed database key form
 214          * @return Title the new object
 215          * @static
 216          * @access public
 217          */
 218         function &makeTitle( $ns, $title ) {
 219                 $t =& new Title();
 220                 $t->mInterwiki = '';
 221                 $t->mFragment = '';
 222                 $t->mNamespace = intval( $ns );
 223                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 224                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 225                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 226                 $t->mTextform = str_replace( '_', ' ', $title );
 227                 return $t;
 228         }
 229
 230         /**
 231          * Create a new Title frrom a namespace index and a DB key.
 232          * The parameters will be checked for validity, which is a bit slower
 233          * than makeTitle() but safer for user-provided data.
 234          *
 235          * @param int $ns the namespace of the article
 236          * @param string $title the database key form
 237          * @return Title the new object, or NULL on an error
 238          * @static
 239          * @access public
 240          */
 241         function makeTitleSafe( $ns, $title ) {
 242                 $t = new Title();
 243                 $t->mDbkeyform = Title::makeName( $ns, $title );
 244                 if( $t->secureAndSplit() ) {
 245                         return $t;
 246                 } else {
 247                         return NULL;
 248                 }
 249         }
 250
 251         /**
 252          * Create a new Title for the Main Page
 253          *
 254          * @static
 255          * @return Title the new object
 256          * @access public
 257          */
 258         function newMainPage() {
 259                 return Title::newFromText( wfMsgForContent( 'mainpage' ) );
 260         }
 261
 262         /**
 263          * Create a new Title for a redirect
 264          * @param string $text the redirect title text
 265          * @return Title the new object, or NULL if the text is not a
 266          *      valid redirect
 267          * @static
 268          * @access public
 269          */
 270         function newFromRedirect( $text ) {
 271                 global $wgMwRedir;
 272                 $rt = NULL;
 273                 if ( $wgMwRedir->matchStart( $text ) ) {
 274                         if ( preg_match( '/\[{2}(.*?)(?:\||\]{2})/', $text, $m ) ) {
 275                                 # categories are escaped using : for example one can enter:
 276                                 # #REDIRECT [[:Category:Music]]. Need to remove it.
 277                                 if ( substr($m[1],0,1) == ':') {
 278                                         # We don't want to keep the ':'
 279                                         $m[1] = substr( $m[1], 1 );
 280                                 }
 281
 282                                 $rt = Title::newFromText( $m[1] );
 283                                 # Disallow redirects to Special:Userlogout
 284                                 if ( !is_null($rt) && $rt->getNamespace() == NS_SPECIAL && preg_match( '/^Userlogout/i', $rt->getText() ) ) {
 285                                         $rt = NULL;
 286                                 }
 287                         }
 288                 }
 289                 return $rt;
 290         }
 291
 292 #----------------------------------------------------------------------------
 293 #       Static functions
 294 #----------------------------------------------------------------------------
 295
 296         /**
 297          * Get the prefixed DB key associated with an ID
 298          * @param int $id the page_id of the article
 299          * @return Title an object representing the article, or NULL
 300          *      if no such article was found
 301          * @static
 302          * @access public
 303          */
 304         function nameOf( $id ) {
 305                 $fname = 'Title::nameOf';
 306                 $dbr =& wfGetDB( DB_SLAVE );
 307
 308                 $s = $dbr->selectRow( 'page', array( 'page_namespace','page_title' ),  array( 'page_id' => $id ), $fname );
 309                 if ( $s === false ) { return NULL; }
 310
 311                 $n = Title::makeName( $s->page_namespace, $s->page_title );
 312                 return $n;
 313         }
 314
 315         /**
 316          * Get a regex character class describing the legal characters in a link
 317          * @return string the list of characters, not delimited
 318          * @static
 319          * @access public
 320          */
 321         function legalChars() {
 322                 global $wgLegalTitleChars;
 323                 return $wgLegalTitleChars;
 324         }
 325
 326         /**
 327          * Get a string representation of a title suitable for
 328          * including in a search index
 329          *
 330          * @param int $ns a namespace index
 331          * @param string $title text-form main part
 332          * @return string a stripped-down title string ready for the
 333          *      search index
 334          */
 335         /* static */ function indexTitle( $ns, $title ) {
 336                 global $wgContLang;
 337                 require_once( 'SearchEngine.php' );
 338
 339                 $lc = SearchEngine::legalSearchChars() . '&#;';
 340                 $t = $wgContLang->stripForSearch( $title );
 341                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 342                 $t = strtolower( $t );
 343
 344                 # Handle 's, s'
 345                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 346                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 347
 348                 $t = preg_replace( "/\\s+/", ' ', $t );
 349
 350                 if ( $ns == NS_IMAGE ) {
 351                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 352                 }
 353                 return trim( $t );
 354         }
 355
 356         /*
 357          * Make a prefixed DB key from a DB key and a namespace index
 358          * @param int $ns numerical representation of the namespace
 359          * @param string $title the DB key form the title
 360          * @return string the prefixed form of the title
 361          */
 362         /* static */ function makeName( $ns, $title ) {
 363                 global $wgContLang;
 364
 365                 $n = $wgContLang->getNsText( $ns );
 366                 return $n == '' ? $title : "$n:$title";
 367         }
 368
 369         /**
 370          * Returns the URL associated with an interwiki prefix
 371          * @param string $key the interwiki prefix (e.g. "MeatBall")
 372          * @return the associated URL, containing "$1", which should be
 373          *      replaced by an article title
 374          * @static (arguably)
 375          * @access public
 376          */
 377         function getInterwikiLink( $key )  {
 378                 global $wgMemc, $wgDBname, $wgInterwikiExpiry, $wgTitleInterwikiCache;
 379                 global $wgInterwikiCache;
 380                 $fname = 'Title::getInterwikiLink';
 381
 382                 $key = strtolower( $key );
 383
 384                 $k = $wgDBname.':interwiki:'.$key;
 385                 if( array_key_exists( $k, $wgTitleInterwikiCache ) ) {
 386                         return $wgTitleInterwikiCache[$k]->iw_url;
 387                 }
 388
 389                 if ($wgInterwikiCache) {
 390                         return Title::getInterwikiCached( $key );
 391                 }
 392
 393                 $s = $wgMemc->get( $k );
 394                 # Ignore old keys with no iw_local
 395                 if( $s && isset( $s->iw_local ) && isset($s->iw_trans)) {
 396                         $wgTitleInterwikiCache[$k] = $s;
 397                         return $s->iw_url;
 398                 }
 399
 400                 $dbr =& wfGetDB( DB_SLAVE );
 401                 $res = $dbr->select( 'interwiki',
 402                         array( 'iw_url', 'iw_local', 'iw_trans' ),
 403                         array( 'iw_prefix' => $key ), $fname );
 404                 if( !$res ) {
 405                         return '';
 406                 }
 407
 408                 $s = $dbr->fetchObject( $res );
 409                 if( !$s ) {
 410                         # Cache non-existence: create a blank object and save it to memcached
 411                         $s = (object)false;
 412                         $s->iw_url = '';
 413                         $s->iw_local = 0;
 414                         $s->iw_trans = 0;
 415                 }
 416                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 417                 $wgTitleInterwikiCache[$k] = $s;
 418
 419                 return $s->iw_url;
 420         }
 421
 422         /**
 423          * Fetch interwiki prefix data from local cache in constant database
 424          *
 425          * More logic is explained in DefaultSettings
 426          *
 427          * @return string URL of interwiki site
 428          * @access public
 429          */
 430         function getInterwikiCached( $key ) {
 431                 global $wgDBname, $wgInterwikiCache, $wgInterwikiScopes, $wgInterwikiFallbackSite;
 432                 global $wgTitleInterwikiCache;
 433                 static $db, $site;
 434
 435                 if (!$db)
 436                         $db=dba_open($wgInterwikiCache,'r','cdb');
 437                 /* Resolve site name */
 438                 if ($wgInterwikiScopes>=3 and !$site) {
 439                         $site = dba_fetch("__sites:{$wgDBname}", $db);
 440                         if ($site=="")
 441                                 $site = $wgInterwikiFallbackSite;
 442                 }
 443                 $value = dba_fetch("{$wgDBname}:{$key}", $db);
 444                 if ($value=='' and $wgInterwikiScopes>=3) {
 445                         /* try site-level */
 446                         $value = dba_fetch("_{$site}:{$key}", $db);
 447                 }
 448                 if ($value=='' and $wgInterwikiScopes>=2) {
 449                         /* try globals */
 450                         $value = dba_fetch("__global:{$key}", $db);
 451                 }
 452                 if ($value=='undef')
 453                         $value='';
 454                 $s = (object)false;
 455                 $s->iw_url = '';
 456                 $s->iw_local = 0;
 457                 $s->iw_trans = 0;
 458                 if ($value!='') {
 459                         list($local,$url)=explode(' ',$value,2);
 460                         $s->iw_url=$url;
 461                         $s->iw_local=(int)$local;
 462                 }
 463                 $wgTitleInterwikiCache[$wgDBname.':interwiki:'.$key] = $s;
 464                 return $s->iw_url;
 465         }
 466         /**
 467          * Determine whether the object refers to a page within
 468          * this project.
 469          *
 470          * @return bool TRUE if this is an in-project interwiki link
 471          *      or a wikilink, FALSE otherwise
 472          * @access public
 473          */
 474         function isLocal() {
 475                 global $wgTitleInterwikiCache, $wgDBname;
 476
 477                 if ( $this->mInterwiki != '' ) {
 478                         # Make sure key is loaded into cache
 479                         $this->getInterwikiLink( $this->mInterwiki );
 480                         $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 481                         return (bool)($wgTitleInterwikiCache[$k]->iw_local);
 482                 } else {
 483                         return true;
 484                 }
 485         }
 486
 487         /**
 488          * Determine whether the object refers to a page within
 489          * this project and is transcludable.
 490          *
 491          * @return bool TRUE if this is transcludable
 492          * @access public
 493          */
 494         function isTrans() {
 495                 global $wgTitleInterwikiCache, $wgDBname;
 496
 497                 if ($this->mInterwiki == '')
 498                         return false;
 499                 # Make sure key is loaded into cache
 500                 $this->getInterwikiLink( $this->mInterwiki );
 501                 $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 502                 return (bool)($wgTitleInterwikiCache[$k]->iw_trans);
 503         }
 504
 505         /**
 506          * Update the page_touched field for an array of title objects
 507          * @todo Inefficient unless the IDs are already loaded into the
 508          *      link cache
 509          * @param array $titles an array of Title objects to be touched
 510          * @param string $timestamp the timestamp to use instead of the
 511          *      default current time
 512          * @static
 513          * @access public
 514          */
 515         function touchArray( $titles, $timestamp = '' ) {
 516
 517                 if ( count( $titles ) == 0 ) {
 518                         return;
 519                 }
 520                 $dbw =& wfGetDB( DB_MASTER );
 521                 if ( $timestamp == '' ) {
 522                         $timestamp = $dbw->timestamp();
 523                 }
 524                 /*
 525                 $page = $dbw->tableName( 'page' );
 526                 $sql = "UPDATE $page SET page_touched='{$timestamp}' WHERE page_id IN (";
 527                 $first = true;
 528
 529                 foreach ( $titles as $title ) {
 530                         if ( $wgUseFileCache ) {
 531                                 $cm = new CacheManager($title);
 532                                 @unlink($cm->fileCacheName());
 533                         }
 534
 535                         if ( ! $first ) {
 536                                 $sql .= ',';
 537                         }
 538                         $first = false;
 539                         $sql .= $title->getArticleID();
 540                 }
 541                 $sql .= ')';
 542                 if ( ! $first ) {
 543                         $dbw->query( $sql, 'Title::touchArray' );
 544                 }
 545                 */
 546                 // hack hack hack -- brion 2005-07-11. this was unfriendly to db.
 547                 // do them in small chunks:
 548                 $fname = 'Title::touchArray';
 549                 foreach( $titles as $title ) {
 550                         $dbw->update( 'page',
 551                                 array( 'page_touched' => $timestamp ),
 552                                 array(
 553                                         'page_namespace' => $title->getNamespace(),
 554                                         'page_title'     => $title->getDBkey() ),
 555                                 $fname );
 556                 }
 557         }
 558
 559 #----------------------------------------------------------------------------
 560 #       Other stuff
 561 #----------------------------------------------------------------------------
 562
 563         /** Simple accessors */
 564         /**
 565          * Get the text form (spaces not underscores) of the main part
 566          * @return string
 567          * @access public
 568          */
 569         function getText() { return $this->mTextform; }
 570         /**
 571          * Get the URL-encoded form of the main part
 572          * @return string
 573          * @access public
 574          */
 575         function getPartialURL() { return $this->mUrlform; }
 576         /**
 577          * Get the main part with underscores
 578          * @return string
 579          * @access public
 580          */
 581         function getDBkey() { return $this->mDbkeyform; }
 582         /**
 583          * Get the namespace index, i.e. one of the NS_xxxx constants
 584          * @return int
 585          * @access public
 586          */
 587         function getNamespace() { return $this->mNamespace; }
 588         /**
 589          * Get the namespace text
 590          * @return string
 591          * @access public
 592          */
 593         function getNsText() {
 594                 global $wgContLang;
 595                 return $wgContLang->getNsText( $this->mNamespace );
 596         }
 597         /**
 598          * Get the namespace text of the subject (rather than talk) page
 599          * @return string
 600          * @access public
 601          */
 602         function getSubjectNsText() {
 603                 global $wgContLang;
 604                 return $wgContLang->getNsText( Namespace::getSubject( $this->mNamespace ) );
 605         }
 606
 607         /**
 608          * Get the interwiki prefix (or null string)
 609          * @return string
 610          * @access public
 611          */
 612         function getInterwiki() { return $this->mInterwiki; }
 613         /**
 614          * Get the Title fragment (i.e. the bit after the #)
 615          * @return string
 616          * @access public
 617          */
 618         function getFragment() { return $this->mFragment; }
 619         /**
 620          * Get the default namespace index, for when there is no namespace
 621          * @return int
 622          * @access public
 623          */
 624         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 625
 626         /**
 627          * Get title for search index
 628          * @return string a stripped-down title string ready for the
 629          *      search index
 630          */
 631         function getIndexTitle() {
 632                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 633         }
 634
 635         /**
 636          * Get the prefixed database key form
 637          * @return string the prefixed title, with underscores and
 638          *      any interwiki and namespace prefixes
 639          * @access public
 640          */
 641         function getPrefixedDBkey() {
 642                 $s = $this->prefix( $this->mDbkeyform );
 643                 $s = str_replace( ' ', '_', $s );
 644                 return $s;
 645         }
 646
 647         /**
 648          * Get the prefixed title with spaces.
 649          * This is the form usually used for display
 650          * @return string the prefixed title, with spaces
 651          * @access public
 652          */
 653         function getPrefixedText() {
 654                 global $wgContLang;
 655                 if ( empty( $this->mPrefixedText ) ) { // FIXME: bad usage of empty() ?
 656                         $s = $this->prefix( $this->mTextform );
 657                         $s = str_replace( '_', ' ', $s );
 658                         $this->mPrefixedText = $s;
 659                 }
 660                 return $this->mPrefixedText;
 661         }
 662
 663         /**
 664          * Get the prefixed title with spaces, plus any fragment
 665          * (part beginning with '#')
 666          * @return string the prefixed title, with spaces and
 667          *      the fragment, including '#'
 668          * @access public
 669          */
 670         function getFullText() {
 671                 global $wgContLang;
 672                 $text = $this->getPrefixedText();
 673                 if( '' != $this->mFragment ) {
 674                         $text .= '#' . $this->mFragment;
 675                 }
 676                 return $text;
 677         }
 678
 679         /**
 680          * Get a URL-encoded title (not an actual URL) including interwiki
 681          * @return string the URL-encoded form
 682          * @access public
 683          */
 684         function getPrefixedURL() {
 685                 $s = $this->prefix( $this->mDbkeyform );
 686                 $s = str_replace( ' ', '_', $s );
 687
 688                 $s = wfUrlencode ( $s ) ;
 689
 690                 # Cleaning up URL to make it look nice -- is this safe?
 691                 $s = str_replace( '%28', '(', $s );
 692                 $s = str_replace( '%29', ')', $s );
 693
 694                 return $s;
 695         }
 696
 697         /**
 698          * Get a real URL referring to this title, with interwiki link and
 699          * fragment
 700          *
 701          * @param string $query an optional query string, not used
 702          *      for interwiki links
 703          * @return string the URL
 704          * @access public
 705          */
 706         function getFullURL( $query = '' ) {
 707                 global $wgContLang, $wgServer, $wgRequest;
 708
 709                 if ( '' == $this->mInterwiki ) {
 710                         $url = $this->getLocalUrl( $query );
 711
 712                         // Ugly quick hack to avoid duplicate prefixes (bug 4571 etc)
 713                         // Correct fix would be to move the prepending elsewhere.
 714                         if ($wgRequest->getVal('action') != 'render') {
 715                                 $url = $wgServer . $url;
 716                         }
 717                 } else {
 718                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 719
 720                         $namespace = $wgContLang->getNsText( $this->mNamespace );
 721                         if ( '' != $namespace ) {
 722                                 # Can this actually happen? Interwikis shouldn't be parsed.
 723                                 $namespace .= ':';
 724                         }
 725                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 726                         if( $query != '' ) {
 727                                 if( false === strpos( $url, '?' ) ) {
 728                                         $url .= '?';
 729                                 } else {
 730                                         $url .= '&';
 731                                 }
 732                                 $url .= $query;
 733                         }
 734                         if ( '' != $this->mFragment ) {
 735                                 $url .= '#' . $this->mFragment;
 736                         }
 737                 }
 738                 wfRunHooks( 'GetFullURL', array( &$this, &$url, $query ) );
 739                 return $url;
 740         }
 741
 742         /**
 743          * Get a URL with no fragment or server name.  If this page is generated
 744          * with action=render, $wgServer is prepended.
 745          * @param string $query an optional query string; if not specified,
 746          *      $wgArticlePath will be used.
 747          * @return string the URL
 748          * @access public
 749          */
 750         function getLocalURL( $query = '' ) {
 751                 global $wgArticlePath, $wgScript, $wgServer, $wgRequest;
 752
 753                 if ( $this->isExternal() ) {
 754                         $url = $this->getFullURL();
 755                         if ( $query ) {
 756                                 // This is currently only used for edit section links in the
 757                                 // context of interwiki transclusion. In theory we should
 758                                 // append the query to the end of any existing query string,
 759                                 // but interwiki transclusion is already broken in that case.
 760                                 $url .= "?$query";
 761                         }
 762                 } else {
 763                         $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 764                         if ( $query == '' ) {
 765                                 $url = str_replace( '$1', $dbkey, $wgArticlePath );
 766                         } else {
 767                                 global $wgActionPaths;
 768                                 $url = false;
 769                                 if( !empty( $wgActionPaths ) &&
 770                                         preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) )
 771                                 {
 772                                         $action = urldecode( $matches[2] );
 773                                         if( isset( $wgActionPaths[$action] ) ) {
 774                                                 $query = $matches[1];
 775                                                 if( isset( $matches[4] ) ) $query .= $matches[4];
 776                                                 $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 777                                                 if( $query != '' ) $url .= '?' . $query;
 778                                         }
 779                                 }
 780                                 if ( $url === false ) {
 781                                         if ( $query == '-' ) {
 782                                                 $query = '';
 783                                         }
 784                                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 785                                 }
 786                         }
 787
 788                         // FIXME: this causes breakage in various places when we
 789                         // actually expected a local URL and end up with dupe prefixes.
 790                         if ($wgRequest->getVal('action') == 'render') {
 791                                 $url = $wgServer . $url;
 792                         }
 793                 }
 794                 wfRunHooks( 'GetLocalURL', array( &$this, &$url, $query ) );
 795                 return $url;
 796         }
 797
 798         /**
 799          * Get an HTML-escaped version of the URL form, suitable for
 800          * using in a link, without a server name or fragment
 801          * @param string $query an optional query string
 802          * @return string the URL
 803          * @access public
 804          */
 805         function escapeLocalURL( $query = '' ) {
 806                 return htmlspecialchars( $this->getLocalURL( $query ) );
 807         }
 808
 809         /**
 810          * Get an HTML-escaped version of the URL form, suitable for
 811          * using in a link, including the server name and fragment
 812          *
 813          * @return string the URL
 814          * @param string $query an optional query string
 815          * @access public
 816          */
 817         function escapeFullURL( $query = '' ) {
 818                 return htmlspecialchars( $this->getFullURL( $query ) );
 819         }
 820
 821         /**
 822          * Get the URL form for an internal link.
 823          * - Used in various Squid-related code, in case we have a different
 824          * internal hostname for the server from the exposed one.
 825          *
 826          * @param string $query an optional query string
 827          * @return string the URL
 828          * @access public
 829          */
 830         function getInternalURL( $query = '' ) {
 831                 global $wgInternalServer;
 832                 $url = $wgInternalServer . $this->getLocalURL( $query );
 833                 wfRunHooks( 'GetInternalURL', array( &$this, &$url, $query ) );
 834                 return $url;
 835         }
 836
 837         /**
 838          * Get the edit URL for this Title
 839          * @return string the URL, or a null string if this is an
 840          *      interwiki link
 841          * @access public
 842          */
 843         function getEditURL() {
 844                 global $wgServer, $wgScript;
 845
 846                 if ( '' != $this->mInterwiki ) { return ''; }
 847                 $s = $this->getLocalURL( 'action=edit' );
 848
 849                 return $s;
 850         }
 851
 852         /**
 853          * Get the HTML-escaped displayable text form.
 854          * Used for the title field in <a> tags.
 855          * @return string the text, including any prefixes
 856          * @access public
 857          */
 858         function getEscapedText() {
 859                 return htmlspecialchars( $this->getPrefixedText() );
 860         }
 861
 862         /**
 863          * Is this Title interwiki?
 864          * @return boolean
 865          * @access public
 866          */
 867         function isExternal() { return ( '' != $this->mInterwiki ); }
 868
 869         /**
 870          * Does the title correspond to a protected article?
 871          * @param string $what the action the page is protected from,
 872          *      by default checks move and edit
 873          * @return boolean
 874          * @access public
 875          */
 876         function isProtected( $action = '' ) {
 877                 global $wgRestrictionLevels;
 878                 if ( -1 == $this->mNamespace ) { return true; }
 879
 880                 if( $action == 'edit' || $action == '' ) {
 881                         $r = $this->getRestrictions( 'edit' );
 882                         foreach( $wgRestrictionLevels as $level ) {
 883                                 if( in_array( $level, $r ) && $level != '' ) {
 884                                         return( true );
 885                                 }
 886                         }
 887                 }
 888
 889                 if( $action == 'move' || $action == '' ) {
 890                         $r = $this->getRestrictions( 'move' );
 891                         foreach( $wgRestrictionLevels as $level ) {
 892                                 if( in_array( $level, $r ) && $level != '' ) {
 893                                         return( true );
 894                                 }
 895                         }
 896                 }
 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          * Can $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::userCan';
 927                 wfProfileIn( $fname );
 928
 929                 global $wgUser;
 930
 931                 $result = true;
 932                 if ( !wfRunHooks( 'userCan', array( &$this, &$wgUser, $action, &$result ) ) ) {
 933                         wfProfileOut( $fname );
 934                         return $result;
 935                 }
 936
 937                 if( NS_SPECIAL == $this->mNamespace ) {
 938                         wfProfileOut( $fname );
 939                         return false;
 940                 }
 941                 // XXX: This is the code that prevents unprotecting a page in NS_MEDIAWIKI
 942                 // from taking effect -ævar
 943                 if( NS_MEDIAWIKI == $this->mNamespace &&
 944                     !$wgUser->isAllowed('editinterface') ) {
 945                         wfProfileOut( $fname );
 946                         return false;
 947                 }
 948
 949                 if( $this->mDbkeyform == '_' ) {
 950                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
 951                         wfProfileOut( $fname );
 952                         return false;
 953                 }
 954
 955                 # protect global styles and js
 956                 if ( NS_MEDIAWIKI == $this->mNamespace
 957                  && preg_match("/\\.(css|js)$/", $this->mTextform )
 958                      && !$wgUser->isAllowed('editinterface') ) {
 959                         wfProfileOut( $fname );
 960                         return false;
 961                 }
 962
 963                 # protect css/js subpages of user pages
 964                 # XXX: this might be better using restrictions
 965                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
 966                 if( NS_USER == $this->mNamespace
 967                         && preg_match("/\\.(css|js)$/", $this->mTextform )
 968                         && !$wgUser->isAllowed('editinterface')
 969                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
 970                         wfProfileOut( $fname );
 971                         return false;
 972                 }
 973
 974                 foreach( $this->getRestrictions($action) as $right ) {
 975                         // Backwards compatibility, rewrite sysop -> protect
 976                         if ( $right == 'sysop' ) {
 977                                 $right = 'protect';
 978                         }
 979                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
 980                                 wfProfileOut( $fname );
 981                                 return false;
 982                         }
 983                 }
 984
 985                 if( $action == 'move' &&
 986                         !( $this->isMovable() && $wgUser->isAllowed( 'move' ) ) ) {
 987                         wfProfileOut( $fname );
 988                         return false;
 989                 }
 990
 991                 if( $action == 'create' ) {
 992                         if( (  $this->isTalkPage() && !$wgUser->isAllowed( 'createtalk' ) ) ||
 993                                 ( !$this->isTalkPage() && !$wgUser->isAllowed( 'createpage' ) ) ) {
 994                                 return false;
 995                         }
 996                 }
 997
 998                 wfProfileOut( $fname );
 999                 return true;
1000         }
1001
1002         /**
1003          * Can $wgUser edit this page?
1004          * @return boolean
1005          * @access public
1006          */
1007         function userCanEdit() {
1008                 return $this->userCan('edit');
1009         }
1010
1011         /**
1012          * Can $wgUser move this page?
1013          * @return boolean
1014          * @access public
1015          */
1016         function userCanMove() {
1017                 return $this->userCan('move');
1018         }
1019
1020         /**
1021          * Would anybody with sufficient privileges be able to move this page?
1022          * Some pages just aren't movable.
1023          *
1024          * @return boolean
1025          * @access public
1026          */
1027         function isMovable() {
1028                 return Namespace::isMovable( $this->getNamespace() )
1029                         && $this->getInterwiki() == '';
1030         }
1031
1032         /**
1033          * Can $wgUser read this page?
1034          * @return boolean
1035          * @access public
1036          */
1037         function userCanRead() {
1038                 global $wgUser;
1039
1040                 $result = true;
1041                         if ( !wfRunHooks( 'userCan', array( &$this, &$wgUser, "read", &$result ) ) ) {
1042                         return $result;
1043                 }
1044
1045                 if( $wgUser->isAllowed('read') ) {
1046                         return true;
1047                 } else {
1048                         global $wgWhitelistRead;
1049
1050                         /** If anon users can create an account,
1051                             they need to reach the login page first! */
1052                         if( $wgUser->isAllowed( 'createaccount' )
1053                             && $this->getNamespace() == NS_SPECIAL
1054                             && $this->getText() == 'Userlogin' ) {
1055                                 return true;
1056                         }
1057
1058                         /** some pages are explicitly allowed */
1059                         $name = $this->getPrefixedText();
1060                         if( $wgWhitelistRead && in_array( $name, $wgWhitelistRead ) ) {
1061                                 return true;
1062                         }
1063
1064                         # Compatibility with old settings
1065                         if( $wgWhitelistRead && $this->getNamespace() == NS_MAIN ) {
1066                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
1067                                         return true;
1068                                 }
1069                         }
1070                 }
1071                 return false;
1072         }
1073
1074         /**
1075          * Is this a talk page of some sort?
1076          * @return bool
1077          * @access public
1078          */
1079         function isTalkPage() {
1080                 return Namespace::isTalk( $this->getNamespace() );
1081         }
1082
1083         /**
1084          * Is this a .css or .js subpage of a user page?
1085          * @return bool
1086          * @access public
1087          */
1088         function isCssJsSubpage() {
1089                 return ( NS_USER == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
1090         }
1091         /**
1092          * Is this a .css subpage of a user page?
1093          * @return bool
1094          * @access public
1095          */
1096         function isCssSubpage() {
1097                 return ( NS_USER == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
1098         }
1099         /**
1100          * Is this a .js subpage of a user page?
1101          * @return bool
1102          * @access public
1103          */
1104         function isJsSubpage() {
1105                 return ( NS_USER == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
1106         }
1107         /**
1108          * Protect css/js subpages of user pages: can $wgUser edit
1109          * this page?
1110          *
1111          * @return boolean
1112          * @todo XXX: this might be better using restrictions
1113          * @access public
1114          */
1115         function userCanEditCssJsSubpage() {
1116                 global $wgUser;
1117                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1118         }
1119
1120         /**
1121          * Loads a string into mRestrictions array
1122          * @param string $res restrictions in string format
1123          * @access public
1124          */
1125         function loadRestrictions( $res ) {
1126                 foreach( explode( ':', trim( $res ) ) as $restrict ) {
1127                         $temp = explode( '=', trim( $restrict ) );
1128                         if(count($temp) == 1) {
1129                                 // old format should be treated as edit/move restriction
1130                                 $this->mRestrictions["edit"] = explode( ',', trim( $temp[0] ) );
1131                                 $this->mRestrictions["move"] = explode( ',', trim( $temp[0] ) );
1132                         } else {
1133                                 $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1134                         }
1135                 }
1136                 $this->mRestrictionsLoaded = true;
1137         }
1138
1139         /**
1140          * Accessor/initialisation for mRestrictions
1141          * @param string $action action that permission needs to be checked for
1142          * @return array the array of groups allowed to edit this article
1143          * @access public
1144          */
1145         function getRestrictions($action) {
1146                 $id = $this->getArticleID();
1147                 if ( 0 == $id ) { return array(); }
1148
1149                 if ( ! $this->mRestrictionsLoaded ) {
1150                         $dbr =& wfGetDB( DB_SLAVE );
1151                         $res = $dbr->selectField( 'page', 'page_restrictions', 'page_id='.$id );
1152                         $this->loadRestrictions( $res );
1153                 }
1154                 if( isset( $this->mRestrictions[$action] ) ) {
1155                         return $this->mRestrictions[$action];
1156                 }
1157                 return array();
1158         }
1159
1160         /**
1161          * Is there a version of this page in the deletion archive?
1162          * @return int the number of archived revisions
1163          * @access public
1164          */
1165         function isDeleted() {
1166                 $fname = 'Title::isDeleted';
1167                 if ( $this->getNamespace() < 0 ) {
1168                         $n = 0;
1169                 } else {
1170                         $dbr =& wfGetDB( DB_SLAVE );
1171                         $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1172                                 'ar_title' => $this->getDBkey() ), $fname );
1173                 }
1174                 return (int)$n;
1175         }
1176
1177         /**
1178          * Get the article ID for this Title from the link cache,
1179          * adding it if necessary
1180          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1181          *      for update
1182          * @return int the ID
1183          * @access public
1184          */
1185         function getArticleID( $flags = 0 ) {
1186                 $linkCache =& LinkCache::singleton();
1187                 if ( $flags & GAID_FOR_UPDATE ) {
1188                         $oldUpdate = $linkCache->forUpdate( true );
1189                         $this->mArticleID = $linkCache->addLinkObj( $this );
1190                         $linkCache->forUpdate( $oldUpdate );
1191                 } else {
1192                         if ( -1 == $this->mArticleID ) {
1193                                 $this->mArticleID = $linkCache->addLinkObj( $this );
1194                         }
1195                 }
1196                 return $this->mArticleID;
1197         }
1198
1199         function getLatestRevID() {
1200                 if ($this->mLatestID !== false)
1201                         return $this->mLatestID;
1202
1203                 $db =& wfGetDB(DB_SLAVE);
1204                 return $this->mLatestID = $db->selectField( 'revision',
1205                         "max(rev_id)",
1206                         array('rev_page' => $this->getArticleID()),
1207                         'Title::getLatestRevID' );
1208         }
1209
1210         /**
1211          * This clears some fields in this object, and clears any associated
1212          * keys in the "bad links" section of the link cache.
1213          *
1214          * - This is called from Article::insertNewArticle() to allow
1215          * loading of the new page_id. It's also called from
1216          * Article::doDeleteArticle()
1217          *
1218          * @param int $newid the new Article ID
1219          * @access public
1220          */
1221         function resetArticleID( $newid ) {
1222                 $linkCache =& LinkCache::singleton();
1223                 $linkCache->clearBadLink( $this->getPrefixedDBkey() );
1224
1225                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1226                 else { $this->mArticleID = $newid; }
1227                 $this->mRestrictionsLoaded = false;
1228                 $this->mRestrictions = array();
1229         }
1230
1231         /**
1232          * Updates page_touched for this page; called from LinksUpdate.php
1233          * @return bool true if the update succeded
1234          * @access public
1235          */
1236         function invalidateCache() {
1237                 global $wgUseFileCache;
1238
1239                 if ( wfReadOnly() ) {
1240                         return;
1241                 }
1242
1243                 $dbw =& wfGetDB( DB_MASTER );
1244                 $success = $dbw->update( 'page',
1245                         array( /* SET */
1246                                 'page_touched' => $dbw->timestamp()
1247                         ), array( /* WHERE */
1248                                 'page_namespace' => $this->getNamespace() ,
1249                                 'page_title' => $this->getDBkey()
1250                         ), 'Title::invalidateCache'
1251                 );
1252
1253                 if ($wgUseFileCache) {
1254                         $cache = new CacheManager($this);
1255                         @unlink($cache->fileCacheName());
1256                 }
1257
1258                 return $success;
1259         }
1260
1261         /**
1262          * Prefix some arbitrary text with the namespace or interwiki prefix
1263          * of this object
1264          *
1265          * @param string $name the text
1266          * @return string the prefixed text
1267          * @access private
1268          */
1269         /* private */ function prefix( $name ) {
1270                 global $wgContLang;
1271
1272                 $p = '';
1273                 if ( '' != $this->mInterwiki ) {
1274                         $p = $this->mInterwiki . ':';
1275                 }
1276                 if ( 0 != $this->mNamespace ) {
1277                         $p .= $wgContLang->getNsText( $this->mNamespace ) . ':';
1278                 }
1279                 return $p . $name;
1280         }
1281
1282         /**
1283          * Secure and split - main initialisation function for this object
1284          *
1285          * Assumes that mDbkeyform has been set, and is urldecoded
1286          * and uses underscores, but not otherwise munged.  This function
1287          * removes illegal characters, splits off the interwiki and
1288          * namespace prefixes, sets the other forms, and canonicalizes
1289          * everything.
1290          * @return bool true on success
1291          * @access private
1292          */
1293         /* private */ function secureAndSplit() {
1294                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1295                 $fname = 'Title::secureAndSplit';
1296
1297                 # Initialisation
1298                 static $rxTc = false;
1299                 if( !$rxTc ) {
1300                         # % is needed as well
1301                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/S';
1302                 }
1303
1304                 $this->mInterwiki = $this->mFragment = '';
1305                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1306
1307                 # Clean up whitespace
1308                 #
1309                 $t = preg_replace( '/[ _]+/', '_', $this->mDbkeyform );
1310                 $t = trim( $t, '_' );
1311
1312                 if ( '' == $t ) {
1313                         return false;
1314                 }
1315
1316                 if( false !== strpos( $t, UTF8_REPLACEMENT ) ) {
1317                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1318                         return false;
1319                 }
1320
1321                 $this->mDbkeyform = $t;
1322
1323                 # Initial colon indicates main namespace rather than specified default
1324                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
1325                 if ( ':' == $t{0} ) {
1326                         $this->mNamespace = NS_MAIN;
1327                         $t = substr( $t, 1 ); # remove the colon but continue processing
1328                 }
1329
1330                 # Namespace or interwiki prefix
1331                 $firstPass = true;
1332                 do {
1333                         if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $t, $m ) ) {
1334                                 $p = $m[1];
1335                                 $lowerNs = strtolower( $p );
1336                                 if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1337                                         # Canonical namespace
1338                                         $t = $m[2];
1339                                         $this->mNamespace = $ns;
1340                                 } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1341                                         # Ordinary namespace
1342                                         $t = $m[2];
1343                                         $this->mNamespace = $ns;
1344                                 } elseif( $this->getInterwikiLink( $p ) ) {
1345                                         if( !$firstPass ) {
1346                                                 # Can't make a local interwiki link to an interwiki link.
1347                                                 # That's just crazy!
1348                                                 return false;
1349                                         }
1350
1351                                         # Interwiki link
1352                                         $t = $m[2];
1353                                         $this->mInterwiki = strtolower( $p );
1354
1355                                         # Redundant interwiki prefix to the local wiki
1356                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1357                                                 if( $t == '' ) {
1358                                                         # Can't have an empty self-link
1359                                                         return false;
1360                                                 }
1361                                                 $this->mInterwiki = '';
1362                                                 $firstPass = false;
1363                                                 # Do another namespace split...
1364                                                 continue;
1365                                         }
1366
1367                                         # If there's an initial colon after the interwiki, that also
1368                                         # resets the default namespace
1369                                         if ( $t !== '' && $t[0] == ':' ) {
1370                                                 $this->mNamespace = NS_MAIN;
1371                                                 $t = substr( $t, 1 );
1372                                         }
1373                                 }
1374                                 # If there's no recognized interwiki or namespace,
1375                                 # then let the colon expression be part of the title.
1376                         }
1377                         break;
1378                 } while( true );
1379                 $r = $t;
1380
1381                 # We already know that some pages won't be in the database!
1382                 #
1383                 if ( '' != $this->mInterwiki || -1 == $this->mNamespace ) {
1384                         $this->mArticleID = 0;
1385                 }
1386                 $f = strstr( $r, '#' );
1387                 if ( false !== $f ) {
1388                         $this->mFragment = substr( $f, 1 );
1389                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
1390                         # remove whitespace again: prevents "Foo_bar_#"
1391                         # becoming "Foo_bar_"
1392                         $r = preg_replace( '/_*$/', '', $r );
1393                 }
1394
1395                 # Reject illegal characters.
1396                 #
1397                 if( preg_match( $rxTc, $r ) ) {
1398                         return false;
1399                 }
1400
1401                 /**
1402                  * Pages with "/./" or "/../" appearing in the URLs will
1403                  * often be unreachable due to the way web browsers deal
1404                  * with 'relative' URLs. Forbid them explicitly.
1405                  */
1406                 if ( strpos( $r, '.' ) !== false &&
1407                      ( $r === '.' || $r === '..' ||
1408                        strpos( $r, './' ) === 0  ||
1409                        strpos( $r, '../' ) === 0 ||
1410                        strpos( $r, '/./' ) !== false ||
1411                        strpos( $r, '/../' ) !== false ) )
1412                 {
1413                         return false;
1414                 }
1415
1416                 # We shouldn't need to query the DB for the size.
1417                 #$maxSize = $dbr->textFieldSize( 'page', 'page_title' );
1418                 if ( strlen( $r ) > 255 ) {
1419                         return false;
1420                 }
1421
1422                 /**
1423                  * Normally, all wiki links are forced to have
1424                  * an initial capital letter so [[foo]] and [[Foo]]
1425                  * point to the same place.
1426                  *
1427                  * Don't force it for interwikis, since the other
1428                  * site might be case-sensitive.
1429                  */
1430                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1431                         $t = $wgContLang->ucfirst( $r );
1432                 } else {
1433                         $t = $r;
1434                 }
1435
1436                 /**
1437                  * Can't make a link to a namespace alone...
1438                  * "empty" local links can only be self-links
1439                  * with a fragment identifier.
1440                  */
1441                 if( $t == '' &&
1442                         $this->mInterwiki == '' &&
1443                         $this->mNamespace != NS_MAIN ) {
1444                         return false;
1445                 }
1446
1447                 # Fill fields
1448                 $this->mDbkeyform = $t;
1449                 $this->mUrlform = wfUrlencode( $t );
1450
1451                 $this->mTextform = str_replace( '_', ' ', $t );
1452
1453                 return true;
1454         }
1455
1456         /**
1457          * Get a Title object associated with the talk page of this article
1458          * @return Title the object for the talk page
1459          * @access public
1460          */
1461         function getTalkPage() {
1462                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1463         }
1464
1465         /**
1466          * Get a title object associated with the subject page of this
1467          * talk page
1468          *
1469          * @return Title the object for the subject page
1470          * @access public
1471          */
1472         function getSubjectPage() {
1473                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1474         }
1475
1476         /**
1477          * Get an array of Title objects linking to this Title
1478          * Also stores the IDs in the link cache.
1479          *
1480          * @param string $options may be FOR UPDATE
1481          * @return array the Title objects linking here
1482          * @access public
1483          */
1484         function getLinksTo( $options = '', $table = 'pagelinks', $prefix = 'pl' ) {
1485                 $linkCache =& LinkCache::singleton();
1486                 $id = $this->getArticleID();
1487
1488                 if ( $options ) {
1489                         $db =& wfGetDB( DB_MASTER );
1490                 } else {
1491                         $db =& wfGetDB( DB_SLAVE );
1492                 }
1493
1494                 $res = $db->select( array( 'page', $table ),
1495                         array( 'page_namespace', 'page_title', 'page_id' ),
1496                         array(
1497                                 "{$prefix}_from=page_id",
1498                                 "{$prefix}_namespace" => $this->getNamespace(),
1499                                 "{$prefix}_title"     => $this->getDbKey() ),
1500                         'Title::getLinksTo',
1501                         $options );
1502
1503                 $retVal = array();
1504                 if ( $db->numRows( $res ) ) {
1505                         while ( $row = $db->fetchObject( $res ) ) {
1506                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1507                                         $linkCache->addGoodLinkObj( $row->page_id, $titleObj );
1508                                         $retVal[] = $titleObj;
1509                                 }
1510                         }
1511                 }
1512                 $db->freeResult( $res );
1513                 return $retVal;
1514         }
1515
1516         /**
1517          * Get an array of Title objects using this Title as a template
1518          * Also stores the IDs in the link cache.
1519          *
1520          * @param string $options may be FOR UPDATE
1521          * @return array the Title objects linking here
1522          * @access public
1523          */
1524         function getTemplateLinksTo( $options = '' ) {
1525                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
1526         }
1527
1528         /**
1529          * Get an array of Title objects referring to non-existent articles linked from this page
1530          *
1531          * @param string $options may be FOR UPDATE
1532          * @return array the Title objects
1533          * @access public
1534          */
1535         function getBrokenLinksFrom( $options = '' ) {
1536                 if ( $options ) {
1537                         $db =& wfGetDB( DB_MASTER );
1538                 } else {
1539                         $db =& wfGetDB( DB_SLAVE );
1540                 }
1541
1542                 $res = $db->safeQuery(
1543                           "SELECT pl_namespace, pl_title
1544                              FROM !
1545                         LEFT JOIN !
1546                                ON pl_namespace=page_namespace
1547                               AND pl_title=page_title
1548                             WHERE pl_from=?
1549                               AND page_namespace IS NULL
1550                                   !",
1551                         $db->tableName( 'pagelinks' ),
1552                         $db->tableName( 'page' ),
1553                         $this->getArticleId(),
1554                         $options );
1555
1556                 $retVal = array();
1557                 if ( $db->numRows( $res ) ) {
1558                         while ( $row = $db->fetchObject( $res ) ) {
1559                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
1560                         }
1561                 }
1562                 $db->freeResult( $res );
1563                 return $retVal;
1564         }
1565
1566
1567         /**
1568          * Get a list of URLs to purge from the Squid cache when this
1569          * page changes
1570          *
1571          * @return array the URLs
1572          * @access public
1573          */
1574         function getSquidURLs() {
1575                 return array(
1576                         $this->getInternalURL(),
1577                         $this->getInternalURL( 'action=history' )
1578                 );
1579         }
1580
1581         /**
1582          * Move this page without authentication
1583          * @param Title &$nt the new page Title
1584          * @access public
1585          */
1586         function moveNoAuth( &$nt ) {
1587                 return $this->moveTo( $nt, false );
1588         }
1589
1590         /**
1591          * Check whether a given move operation would be valid.
1592          * Returns true if ok, or a message key string for an error message
1593          * if invalid. (Scarrrrry ugly interface this.)
1594          * @param Title &$nt the new title
1595          * @param bool $auth indicates whether $wgUser's permissions
1596          *      should be checked
1597          * @return mixed true on success, message name on failure
1598          * @access public
1599          */
1600         function isValidMoveOperation( &$nt, $auth = true ) {
1601                 global $wgUser;
1602                 if( !$this or !$nt ) {
1603                         return 'badtitletext';
1604                 }
1605                 if( $this->equals( $nt ) ) {
1606                         return 'selfmove';
1607                 }
1608                 if( !$this->isMovable() || !$nt->isMovable() ) {
1609                         return 'immobile_namespace';
1610                 }
1611
1612                 $oldid = $this->getArticleID();
1613                 $newid = $nt->getArticleID();
1614
1615                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1616                         return 'articleexists';
1617                 }
1618                 if ( ( '' == $this->getDBkey() ) ||
1619                          ( !$oldid ) ||
1620                      ( '' == $nt->getDBkey() ) ) {
1621                         return 'badarticleerror';
1622                 }
1623
1624                 if ( $auth && (
1625                                 !$this->userCanEdit() || !$nt->userCanEdit() ||
1626                                 !$this->userCanMove() || !$nt->userCanMove() ) ) {
1627                         return 'protectedpage';
1628                 }
1629
1630                 # The move is allowed only if (1) the target doesn't exist, or
1631                 # (2) the target is a redirect to the source, and has no history
1632                 # (so we can undo bad moves right after they're done).
1633
1634                 if ( 0 != $newid ) { # Target exists; check for validity
1635                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1636                                 return 'articleexists';
1637                         }
1638                 }
1639                 return true;
1640         }
1641
1642         /**
1643          * Move a title to a new location
1644          * @param Title &$nt the new title
1645          * @param bool $auth indicates whether $wgUser's permissions
1646          *      should be checked
1647          * @return mixed true on success, message name on failure
1648          * @access public
1649          */
1650         function moveTo( &$nt, $auth = true, $reason = '' ) {
1651                 $err = $this->isValidMoveOperation( $nt, $auth );
1652                 if( is_string( $err ) ) {
1653                         return $err;
1654                 }
1655
1656                 $pageid = $this->getArticleID();
1657                 if( $nt->exists() ) {
1658                         $this->moveOverExistingRedirect( $nt, $reason );
1659                         $pageCountChange = 0;
1660                 } else { # Target didn't exist, do normal move.
1661                         $this->moveToNewTitle( $nt, $reason );
1662                         $pageCountChange = 1;
1663                 }
1664                 $redirid = $this->getArticleID();
1665
1666                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
1667                 $dbw =& wfGetDB( DB_MASTER );
1668                 $categorylinks = $dbw->tableName( 'categorylinks' );
1669                 $sql = "UPDATE $categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
1670                         " WHERE cl_from=" . $dbw->addQuotes( $pageid ) .
1671                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
1672                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
1673
1674                 # Update watchlists
1675
1676                 $oldnamespace = $this->getNamespace() & ~1;
1677                 $newnamespace = $nt->getNamespace() & ~1;
1678                 $oldtitle = $this->getDBkey();
1679                 $newtitle = $nt->getDBkey();
1680
1681                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
1682                         WatchedItem::duplicateEntries( $this, $nt );
1683                 }
1684
1685                 # Update search engine
1686                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
1687                 $u->doUpdate();
1688                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
1689                 $u->doUpdate();
1690
1691                 # Update site_stats
1692                 if ( $this->getNamespace() == NS_MAIN and $nt->getNamespace() != NS_MAIN ) {
1693                         # Moved out of main namespace
1694                         # not viewed, edited, removing
1695                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange);
1696                 } elseif ( $this->getNamespace() != NS_MAIN and $nt->getNamespace() == NS_MAIN ) {
1697                         # Moved into main namespace
1698                         # not viewed, edited, adding
1699                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
1700                 } elseif ( $pageCountChange ) {
1701                         # Added redirect
1702                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
1703                 } else{
1704                         $u = false;
1705                 }
1706                 if ( $u ) {
1707                         $u->doUpdate();
1708                 }
1709
1710                 global $wgUser;
1711                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
1712                 return true;
1713         }
1714
1715         /**
1716          * Move page to a title which is at present a redirect to the
1717          * source page
1718          *
1719          * @param Title &$nt the page to move to, which should currently
1720          *      be a redirect
1721          * @access private
1722          */
1723         function moveOverExistingRedirect( &$nt, $reason = '' ) {
1724                 global $wgUser, $wgUseSquid, $wgMwRedir;
1725                 $fname = 'Title::moveOverExistingRedirect';
1726                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1727
1728                 if ( $reason ) {
1729                         $comment .= ": $reason";
1730                 }
1731
1732                 $now = wfTimestampNow();
1733                 $rand = wfRandom();
1734                 $newid = $nt->getArticleID();
1735                 $oldid = $this->getArticleID();
1736                 $dbw =& wfGetDB( DB_MASTER );
1737                 $linkCache =& LinkCache::singleton();
1738
1739                 # Delete the old redirect. We don't save it to history since
1740                 # by definition if we've got here it's rather uninteresting.
1741                 # We have to remove it so that the next step doesn't trigger
1742                 # a conflict on the unique namespace+title index...
1743                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
1744
1745                 # Save a null revision in the page's history notifying of the move
1746                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
1747                 $nullRevId = $nullRevision->insertOn( $dbw );
1748
1749                 # Change the name of the target page:
1750                 $dbw->update( 'page',
1751                         /* SET */ array(
1752                                 'page_touched'   => $dbw->timestamp($now),
1753                                 'page_namespace' => $nt->getNamespace(),
1754                                 'page_title'     => $nt->getDBkey(),
1755                                 'page_latest'    => $nullRevId,
1756                         ),
1757                         /* WHERE */ array( 'page_id' => $oldid ),
1758                         $fname
1759                 );
1760                 $linkCache->clearLink( $nt->getPrefixedDBkey() );
1761
1762                 # Recreate the redirect, this time in the other direction.
1763                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1764                 $redirectArticle = new Article( $this );
1765                 $newid = $redirectArticle->insertOn( $dbw );
1766                 $redirectRevision = new Revision( array(
1767                         'page'    => $newid,
1768                         'comment' => $comment,
1769                         'text'    => $redirectText ) );
1770                 $revid = $redirectRevision->insertOn( $dbw );
1771                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1772                 $linkCache->clearLink( $this->getPrefixedDBkey() );
1773
1774                 # Log the move
1775                 $log = new LogPage( 'move' );
1776                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
1777
1778                 # Now, we record the link from the redirect to the new title.
1779                 # It should have no other outgoing links...
1780                 $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
1781                 $dbw->insert( 'pagelinks',
1782                         array(
1783                                 'pl_from'      => $newid,
1784                                 'pl_namespace' => $nt->getNamespace(),
1785                                 'pl_title'     => $nt->getDbKey() ),
1786                         $fname );
1787
1788                 # Purge squid
1789                 if ( $wgUseSquid ) {
1790                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1791                         $u = new SquidUpdate( $urls );
1792                         $u->doUpdate();
1793                 }
1794         }
1795
1796         /**
1797          * Move page to non-existing title.
1798          * @param Title &$nt the new Title
1799          * @access private
1800          */
1801         function moveToNewTitle( &$nt, $reason = '' ) {
1802                 global $wgUser, $wgUseSquid;
1803                 global $wgMwRedir;
1804                 $fname = 'MovePageForm::moveToNewTitle';
1805                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1806                 if ( $reason ) {
1807                         $comment .= ": $reason";
1808                 }
1809
1810                 $newid = $nt->getArticleID();
1811                 $oldid = $this->getArticleID();
1812                 $dbw =& wfGetDB( DB_MASTER );
1813                 $now = $dbw->timestamp();
1814                 $rand = wfRandom();
1815                 $linkCache =& LinkCache::singleton();
1816
1817                 # Save a null revision in the page's history notifying of the move
1818                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
1819                 $nullRevId = $nullRevision->insertOn( $dbw );
1820
1821                 # Rename cur entry
1822                 $dbw->update( 'page',
1823                         /* SET */ array(
1824                                 'page_touched'   => $now,
1825                                 'page_namespace' => $nt->getNamespace(),
1826                                 'page_title'     => $nt->getDBkey(),
1827                                 'page_latest'    => $nullRevId,
1828                         ),
1829                         /* WHERE */ array( 'page_id' => $oldid ),
1830                         $fname
1831                 );
1832
1833                 $linkCache->clearLink( $nt->getPrefixedDBkey() );
1834
1835                 # Insert redirect
1836                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1837                 $redirectArticle = new Article( $this );
1838                 $newid = $redirectArticle->insertOn( $dbw );
1839                 $redirectRevision = new Revision( array(
1840                         'page'    => $newid,
1841                         'comment' => $comment,
1842                         'text'    => $redirectText ) );
1843                 $revid = $redirectRevision->insertOn( $dbw );
1844                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1845                 $linkCache->clearLink( $this->getPrefixedDBkey() );
1846
1847                 # Log the move
1848                 $log = new LogPage( 'move' );
1849                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
1850
1851                 # Purge caches as per article creation
1852                 Article::onArticleCreate( $nt );
1853
1854                 # Record the just-created redirect's linking to the page
1855                 $dbw->insert( 'pagelinks',
1856                         array(
1857                                 'pl_from'      => $newid,
1858                                 'pl_namespace' => $nt->getNamespace(),
1859                                 'pl_title'     => $nt->getDBkey() ),
1860                         $fname );
1861
1862                 # Non-existent target may have had broken links to it; these must
1863                 # now be touched to update link coloring.
1864                 $nt->touchLinks();
1865
1866                 # Purge old title from squid
1867                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1868                 $titles = $nt->getLinksTo();
1869                 if ( $wgUseSquid ) {
1870                         $urls = $this->getSquidURLs();
1871                         foreach ( $titles as $linkTitle ) {
1872                                 $urls[] = $linkTitle->getInternalURL();
1873                         }
1874                         $u = new SquidUpdate( $urls );
1875                         $u->doUpdate();
1876                 }
1877         }
1878
1879         /**
1880          * Checks if $this can be moved to a given Title
1881          * - Selects for update, so don't call it unless you mean business
1882          *
1883          * @param Title &$nt the new title to check
1884          * @access public
1885          */
1886         function isValidMoveTarget( $nt ) {
1887
1888                 $fname = 'Title::isValidMoveTarget';
1889                 $dbw =& wfGetDB( DB_MASTER );
1890
1891                 # Is it a redirect?
1892                 $id  = $nt->getArticleID();
1893                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
1894                         array( 'page_is_redirect','old_text','old_flags' ),
1895                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
1896                         $fname, 'FOR UPDATE' );
1897
1898                 if ( !$obj || 0 == $obj->page_is_redirect ) {
1899                         # Not a redirect
1900                         return false;
1901                 }
1902                 $text = Revision::getRevisionText( $obj );
1903
1904                 # Does the redirect point to the source?
1905                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
1906                         $redirTitle = Title::newFromText( $m[1] );
1907                         if( !is_object( $redirTitle ) ||
1908                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1909                                 return false;
1910                         }
1911                 } else {
1912                         # Fail safe
1913                         return false;
1914                 }
1915
1916                 # Does the article have a history?
1917                 $row = $dbw->selectRow( array( 'page', 'revision'),
1918                         array( 'rev_id' ),
1919                         array( 'page_namespace' => $nt->getNamespace(),
1920                                 'page_title' => $nt->getDBkey(),
1921                                 'page_id=rev_page AND page_latest != rev_id'
1922                         ), $fname, 'FOR UPDATE'
1923                 );
1924
1925                 # Return true if there was no history
1926                 return $row === false;
1927         }
1928
1929         /**
1930          * Create a redirect; fails if the title already exists; does
1931          * not notify RC
1932          *
1933          * @param Title $dest the destination of the redirect
1934          * @param string $comment the comment string describing the move
1935          * @return bool true on success
1936          * @access public
1937          */
1938         function createRedirect( $dest, $comment ) {
1939                 global $wgUser;
1940                 if ( $this->getArticleID() ) {
1941                         return false;
1942                 }
1943
1944                 $fname = 'Title::createRedirect';
1945                 $dbw =& wfGetDB( DB_MASTER );
1946
1947                 $article = new Article( $this );
1948                 $newid = $article->insertOn( $dbw );
1949                 $revision = new Revision( array(
1950                         'page'      => $newid,
1951                         'comment'   => $comment,
1952                         'text'      => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n",
1953                         ) );
1954                 $revisionId = $revision->insertOn( $dbw );
1955                 $article->updateRevisionOn( $dbw, $revision, 0 );
1956
1957                 # Link table
1958                 $dbw->insert( 'pagelinks',
1959                         array(
1960                                 'pl_from'      => $newid,
1961                                 'pl_namespace' => $dest->getNamespace(),
1962                                 'pl_title'     => $dest->getDbKey()
1963                         ), $fname
1964                 );
1965
1966                 Article::onArticleCreate( $this );
1967                 return true;
1968         }
1969
1970         /**
1971          * Get categories to which this Title belongs and return an array of
1972          * categories' names.
1973          *
1974          * @return array an array of parents in the form:
1975          *      $parent => $currentarticle
1976          * @access public
1977          */
1978         function getParentCategories() {
1979                 global $wgContLang,$wgUser;
1980
1981                 $titlekey = $this->getArticleId();
1982                 $dbr =& wfGetDB( DB_SLAVE );
1983                 $categorylinks = $dbr->tableName( 'categorylinks' );
1984
1985                 # NEW SQL
1986                 $sql = "SELECT * FROM $categorylinks"
1987                      ." WHERE cl_from='$titlekey'"
1988                          ." AND cl_from <> '0'"
1989                          ." ORDER BY cl_sortkey";
1990
1991                 $res = $dbr->query ( $sql ) ;
1992
1993                 if($dbr->numRows($res) > 0) {
1994                         while ( $x = $dbr->fetchObject ( $res ) )
1995                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
1996                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
1997                         $dbr->freeResult ( $res ) ;
1998                 } else {
1999                         $data = '';
2000                 }
2001                 return $data;
2002         }
2003
2004         /**
2005          * Get a tree of parent categories
2006          * @param array $children an array with the children in the keys, to check for circular refs
2007          * @return array
2008          * @access public
2009          */
2010         function getParentCategoryTree( $children = array() ) {
2011                 $parents = $this->getParentCategories();
2012
2013                 if($parents != '') {
2014                         foreach($parents as $parent => $current) {
2015                                 if ( array_key_exists( $parent, $children ) ) {
2016                                         # Circular reference
2017                                         $stack[$parent] = array();
2018                                 } else {
2019                                         $nt = Title::newFromText($parent);
2020                                         $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
2021                                 }
2022                         }
2023                         return $stack;
2024                 } else {
2025                         return array();
2026                 }
2027         }
2028
2029
2030         /**
2031          * Get an associative array for selecting this title from
2032          * the "page" table
2033          *
2034          * @return array
2035          * @access public
2036          */
2037         function pageCond() {
2038                 return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
2039         }
2040
2041         /**
2042          * Get the revision ID of the previous revision
2043          *
2044          * @param integer $revision  Revision ID. Get the revision that was before this one.
2045          * @return interger $oldrevision|false
2046          */
2047         function getPreviousRevisionID( $revision ) {
2048                 $dbr =& wfGetDB( DB_SLAVE );
2049                 return $dbr->selectField( 'revision', 'rev_id',
2050                         'rev_page=' . intval( $this->getArticleId() ) .
2051                         ' AND rev_id<' . intval( $revision ) . ' ORDER BY rev_id DESC' );
2052         }
2053
2054         /**
2055          * Get the revision ID of the next revision
2056          *
2057          * @param integer $revision  Revision ID. Get the revision that was after this one.
2058          * @return interger $oldrevision|false
2059          */
2060         function getNextRevisionID( $revision ) {
2061                 $dbr =& wfGetDB( DB_SLAVE );
2062                 return $dbr->selectField( 'revision', 'rev_id',
2063                         'rev_page=' . intval( $this->getArticleId() ) .
2064                         ' AND rev_id>' . intval( $revision ) . ' ORDER BY rev_id' );
2065         }
2066
2067         /**
2068          * Compare with another title.
2069          *
2070          * @param Title $title
2071          * @return bool
2072          */
2073         function equals( $title ) {
2074                 return $this->getInterwiki() == $title->getInterwiki()
2075                         && $this->getNamespace() == $title->getNamespace()
2076                         && $this->getDbkey() == $title->getDbkey();
2077         }
2078
2079         /**
2080          * Check if page exists
2081          * @return bool
2082          */
2083         function exists() {
2084                 return $this->getArticleId() != 0;
2085         }
2086
2087         /**
2088          * Should a link should be displayed as a known link, just based on its title?
2089          *
2090          * Currently, a self-link with a fragment and special pages are in
2091          * this category. Special pages never exist in the database.
2092          */
2093         function isAlwaysKnown() {
2094                 return  $this->isExternal() || ( 0 == $this->mNamespace && "" == $this->mDbkeyform )
2095                   || NS_SPECIAL == $this->mNamespace;
2096         }
2097
2098         /**
2099          * Update page_touched timestamps on pages linking to this title.
2100          * In principal, this could be backgrounded and could also do squid
2101          * purging.
2102          */
2103         function touchLinks() {
2104                 $fname = 'Title::touchLinks';
2105
2106                 $dbw =& wfGetDB( DB_MASTER );
2107
2108                 $res = $dbw->select( 'pagelinks',
2109                         array( 'pl_from' ),
2110                         array(
2111                                 'pl_namespace' => $this->getNamespace(),
2112                                 'pl_title'     => $this->getDbKey() ),
2113                         $fname );
2114
2115                 $toucharr = array();
2116                 while( $row = $dbw->fetchObject( $res ) ) {
2117                         $toucharr[] = $row->pl_from;
2118                 }
2119                 $dbw->freeResult( $res );
2120
2121                 if( $this->getNamespace() == NS_CATEGORY ) {
2122                         // Categories show up in a separate set of links as well
2123                         $res = $dbw->select( 'categorylinks',
2124                                 array( 'cl_from' ),
2125                                 array( 'cl_to' => $this->getDbKey() ),
2126                                 $fname );
2127                         while( $row = $dbw->fetchObject( $res ) ) {
2128                                 $toucharr[] = $row->cl_from;
2129                         }
2130                         $dbw->freeResult( $res );
2131                 }
2132
2133                 if (!count($toucharr))
2134                         return;
2135                 $dbw->update( 'page', /* SET */ array( 'page_touched' => $dbw->timestamp() ),
2136                                                         /* WHERE */ array( 'page_id' => $toucharr ),$fname);
2137         }
2138
2139         function trackbackURL() {
2140                 global $wgTitle, $wgScriptPath, $wgServer;
2141
2142                 return "$wgServer$wgScriptPath/trackback.php?article="
2143                         . htmlspecialchars(urlencode($wgTitle->getPrefixedDBkey()));
2144         }
2145
2146         function trackbackRDF() {
2147                 $url = htmlspecialchars($this->getFullURL());
2148                 $title = htmlspecialchars($this->getText());
2149                 $tburl = $this->trackbackURL();
2150
2151                 return "
2152 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
2153          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
2154          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
2155 <rdf:Description
2156    rdf:about=\"$url\"
2157    dc:identifier=\"$url\"
2158    dc:title=\"$title\"
2159    trackback:ping=\"$tburl\" />
2160 </rdf:RDF>";
2161         }
2162 }
2163 ?>