includes/Title.php

   1 <?php
   2 /**
   3  * See title.doc
   4  *
   5  * @package MediaWiki
   6  */
   7
   8 /** */
   9 require_once( 'normal/UtfNormal.php' );
  10
  11 $wgTitleInterwikiCache = array();
  12 define ( 'GAID_FOR_UPDATE', 1 );
  13
  14 # Title::newFromTitle maintains a cache to avoid
  15 # expensive re-normalization of commonly used titles.
  16 # On a batch operation this can become a memory leak
  17 # if not bounded. After hitting this many titles,
  18 # reset the cache.
  19 define( 'MW_TITLECACHE_MAX', 1000 );
  20
  21 /**
  22  * Title class
  23  * - Represents a title, which may contain an interwiki designation or namespace
  24  * - Can fetch various kinds of data from the database, albeit inefficiently.
  25  *
  26  * @package MediaWiki
  27  */
  28 class Title {
  29         /**
  30          * All member variables should be considered private
  31          * Please use the accessor functions
  32          */
  33
  34          /**#@+
  35          * @access private
  36          */
  37
  38         var $mTextform;           # Text form (spaces not underscores) of the main part
  39         var $mUrlform;            # URL-encoded form of the main part
  40         var $mDbkeyform;          # Main part with underscores
  41         var $mNamespace;          # Namespace index, i.e. one of the NS_xxxx constants
  42         var $mInterwiki;          # Interwiki prefix (or null string)
  43         var $mFragment;           # Title fragment (i.e. the bit after the #)
  44         var $mArticleID;          # Article ID, fetched from the link cache on demand
  45         var $mRestrictions;       # Array of groups allowed to edit this article
  46                               # Only null or "sysop" are supported
  47         var $mRestrictionsLoaded; # Boolean for initialisation on demand
  48         var $mPrefixedText;       # Text form including namespace/interwiki, initialised on demand
  49         var $mDefaultNamespace;   # Namespace index when there is no namespace
  50                               # Zero except in {{transclusion}} tags
  51         /**#@-*/
  52
  53
  54         /**
  55          * Constructor
  56          * @access private
  57          */
  58         /* private */ function Title() {
  59                 $this->mInterwiki = $this->mUrlform =
  60                 $this->mTextform = $this->mDbkeyform = '';
  61                 $this->mArticleID = -1;
  62                 $this->mNamespace = NS_MAIN;
  63                 $this->mRestrictionsLoaded = false;
  64                 $this->mRestrictions = array();
  65                 # Dont change the following, NS_MAIN is hardcoded in several place
  66                 # See bug #696
  67                 $this->mDefaultNamespace = NS_MAIN;
  68         }
  69
  70         /**
  71          * Create a new Title from a prefixed DB key
  72          * @param string $key The database key, which has underscores
  73          *      instead of spaces, possibly including namespace and
  74          *      interwiki prefixes
  75          * @return Title the new object, or NULL on an error
  76          * @static
  77          * @access public
  78          */
  79         /* static */ function newFromDBkey( $key ) {
  80                 $t = new Title();
  81                 $t->mDbkeyform = $key;
  82                 if( $t->secureAndSplit() )
  83                         return $t;
  84                 else
  85                         return NULL;
  86         }
  87
  88         /**
  89          * Create a new Title from text, such as what one would
  90          * find in a link. Decodes any HTML entities in the text.
  91          *
  92          * @param string $text the link text; spaces, prefixes,
  93          *      and an initial ':' indicating the main namespace
  94          *      are accepted
  95          * @param int $defaultNamespace the namespace to use if
  96          *      none is specified by a prefix
  97          * @return Title the new object, or NULL on an error
  98          * @static
  99          * @access public
 100          */
 101         function &newFromText( $text, $defaultNamespace = NS_MAIN ) {
 102                 $fname = 'Title::newFromText';
 103                 wfProfileIn( $fname );
 104
 105                 /**
 106                  * Wiki pages often contain multiple links to the same page.
 107                  * Title normalization and parsing can become expensive on
 108                  * pages with many links, so we can save a little time by
 109                  * caching them.
 110                  *
 111                  * In theory these are value objects and won't get changed...
 112                  */
 113                 static $titleCache = array();
 114                 if( $defaultNamespace == NS_MAIN && isset( $titleCache[$text] ) ) {
 115                         wfProfileOut( $fname );
 116                         return $titleCache[$text];
 117                 }
 118
 119                 /**
 120                  * Convert things like &eacute; into real text...
 121                  */
 122                 global $wgInputEncoding;
 123                 $filteredText = do_html_entity_decode( $text, ENT_COMPAT, $wgInputEncoding );
 124
 125                 /**
 126                  * Convert things like &#257; or &#x3017; into real text...
 127                  * WARNING: Not friendly to internal links on a latin-1 wiki.
 128                  */
 129                 $filteredText = wfMungeToUtf8( $filteredText );
 130
 131                 # What was this for? TS 2004-03-03
 132                 # $text = urldecode( $text );
 133
 134                 $t =& new Title();
 135                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 136                 $t->mDefaultNamespace = $defaultNamespace;
 137
 138                 if( $t->secureAndSplit() ) {
 139                         if( $defaultNamespace == NS_MAIN ) {
 140                                 if( count( $titleCache ) >= MW_TITLECACHE_MAX ) {
 141                                         # Avoid memory leaks on mass operations...
 142                                         $titleCache = array();
 143                                 }
 144                                 $titleCache[$text] =& $t;
 145                         }
 146                         wfProfileOut( $fname );
 147                         return $t;
 148                 } else {
 149                         wfProfileOut( $fname );
 150                         return NULL;
 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         /* static */ function newFromURL( $url ) {
 163                 global $wgLang, $wgServer;
 164                 $t = new Title();
 165
 166                 # For compatibility with old buggy URLs. "+" is 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                 $s = str_replace( '+', ' ', $url );
 170
 171                 $t->mDbkeyform = str_replace( ' ', '_', $s );
 172                 if( $t->secureAndSplit() ) {
 173                         return $t;
 174                 } else {
 175                         return NULL;
 176                 }
 177         }
 178
 179         /**
 180          * Create a new Title from an article ID
 181          * @todo This is inefficiently implemented, the page row is requested
 182          * but not used for anything else
 183          * @param int $id the page_id corresponding to the Title to create
 184          * @return Title the new object, or NULL on an error
 185          * @access public
 186          */
 187         /* static */ function newFromID( $id ) {
 188                 $fname = 'Title::newFromID';
 189                 $dbr =& wfGetDB( DB_SLAVE );
 190                 $row = $dbr->selectRow( 'page', array( 'page_namespace', 'page_title' ),
 191                         array( 'page_id' => $id ), $fname );
 192                 if ( $row !== false ) {
 193                         $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 194                 } else {
 195                         $title = NULL;
 196                 }
 197                 return $title;
 198         }
 199
 200         /**
 201          * Create a new Title from a namespace index and a DB key.
 202          * It's assumed that $ns and $title are *valid*, for instance when
 203          * they came directly from the database or a special page name.
 204          * For convenience, spaces are converted to underscores so that
 205          * eg user_text fields can be used directly.
 206          *
 207          * @param int $ns the namespace of the article
 208          * @param string $title the unprefixed database key form
 209          * @return Title the new object
 210          * @static
 211          * @access public
 212          */
 213         /* static */ function &makeTitle( $ns, $title ) {
 214                 $t =& new Title();
 215                 $t->mInterwiki = '';
 216                 $t->mFragment = '';
 217                 $t->mNamespace = IntVal( $ns );
 218                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 219                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 220                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 221                 $t->mTextform = str_replace( '_', ' ', $title );
 222                 return $t;
 223         }
 224
 225         /**
 226          * Create a new Title frrom a namespace index and a DB key.
 227          * The parameters will be checked for validity, which is a bit slower
 228          * than makeTitle() but safer for user-provided data.
 229          * @param int $ns the namespace of the article
 230          * @param string $title the database key form
 231          * @return Title the new object, or NULL on an error
 232          * @static
 233          * @access public
 234          */
 235         /* static */ function makeTitleSafe( $ns, $title ) {
 236                 $t = new Title();
 237                 $t->mDbkeyform = Title::makeName( $ns, $title );
 238                 if( $t->secureAndSplit() ) {
 239                         return $t;
 240                 } else {
 241                         return NULL;
 242                 }
 243         }
 244
 245         /**
 246          * Create a new Title for the Main Page
 247          * @static
 248          * @return Title the new object
 249          * @access public
 250          */
 251         /* static */ function newMainPage() {
 252                 return Title::newFromText( wfMsgForContent( 'mainpage' ) );
 253         }
 254
 255         /**
 256          * Create a new Title for a redirect
 257          * @param string $text the redirect title text
 258          * @return Title the new object, or NULL if the text is not a
 259          *      valid redirect
 260          * @static
 261          * @access public
 262          */
 263         /* static */ function newFromRedirect( $text ) {
 264                 global $wgMwRedir;
 265                 $rt = NULL;
 266                 if ( $wgMwRedir->matchStart( $text ) ) {
 267                         if ( preg_match( '/\\[\\[([^\\]\\|]+)[\\]\\|]/', $text, $m ) ) {
 268                                 # categories are escaped using : for example one can enter:
 269                                 # #REDIRECT [[:Category:Music]]. Need to remove it.
 270                                 if ( substr($m[1],0,1) == ':') {
 271                                         # We don't want to keep the ':'
 272                                         $m[1] = substr( $m[1], 1 );
 273                                 }
 274
 275                                 $rt = Title::newFromText( $m[1] );
 276                                 # Disallow redirects to Special:Userlogout
 277                                 if ( !is_null($rt) && $rt->getNamespace() == NS_SPECIAL && preg_match( '/^Userlogout/i', $rt->getText() ) ) {
 278                                         $rt = NULL;
 279                                 }
 280                         }
 281                 }
 282                 return $rt;
 283         }
 284
 285 #----------------------------------------------------------------------------
 286 #       Static functions
 287 #----------------------------------------------------------------------------
 288
 289         /**
 290          * Get the prefixed DB key associated with an ID
 291          * @param int $id the page_id of the article
 292          * @return Title an object representing the article, or NULL
 293          *      if no such article was found
 294          * @static
 295          * @access public
 296          */
 297         /* static */ function nameOf( $id ) {
 298                 $fname = 'Title::nameOf';
 299                 $dbr =& wfGetDB( DB_SLAVE );
 300
 301                 $s = $dbr->selectRow( 'page', array( 'page_namespace','page_title' ),  array( 'page_id' => $id ), $fname );
 302                 if ( $s === false ) { return NULL; }
 303
 304                 $n = Title::makeName( $s->page_namespace, $s->page_title );
 305                 return $n;
 306         }
 307
 308         /**
 309          * Get a regex character class describing the legal characters in a link
 310          * @return string the list of characters, not delimited
 311          * @static
 312          * @access public
 313          */
 314         /* static */ function legalChars() {
 315                 # Missing characters:
 316                 #  * []|# Needed for link syntax
 317                 #  * % and + are corrupted by Apache when they appear in the path
 318                 #
 319                 # % seems to work though
 320                 #
 321                 # The problem with % is that URLs are double-unescaped: once by Apache's
 322                 # path conversion code, and again by PHP. So %253F, for example, becomes "?".
 323                 # Our code does not double-escape to compensate for this, indeed double escaping
 324                 # would break if the double-escaped title was passed in the query string
 325                 # rather than the path. This is a minor security issue because articles can be
 326                 # created such that they are hard to view or edit. -- TS
 327                 #
 328                 # Theoretically 0x80-0x9F of ISO 8859-1 should be disallowed, but
 329                 # this breaks interlanguage links
 330
 331                 $set = " %!\"$&'()*,\\-.\\/0-9:;=?@A-Z\\\\^_`a-z~\\x80-\\xFF";
 332                 return $set;
 333         }
 334
 335         /**
 336          * Get a string representation of a title suitable for
 337          * including in a search index
 338          *
 339          * @param int $ns a namespace index
 340          * @param string $title text-form main part
 341          * @return string a stripped-down title string ready for the
 342          *      search index
 343          */
 344         /* static */ function indexTitle( $ns, $title ) {
 345                 global $wgDBminWordLen, $wgContLang;
 346                 require_once( 'SearchEngine.php' );
 347
 348                 $lc = SearchEngine::legalSearchChars() . '&#;';
 349                 $t = $wgContLang->stripForSearch( $title );
 350                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 351                 $t = strtolower( $t );
 352
 353                 # Handle 's, s'
 354                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 355                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 356
 357                 $t = preg_replace( "/\\s+/", ' ', $t );
 358
 359                 if ( $ns == NS_IMAGE ) {
 360                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 361                 }
 362                 return trim( $t );
 363         }
 364
 365         /*
 366          * Make a prefixed DB key from a DB key and a namespace index
 367          * @param int $ns numerical representation of the namespace
 368          * @param string $title the DB key form the title
 369          * @return string the prefixed form of the title
 370          */
 371         /* static */ function makeName( $ns, $title ) {
 372                 global $wgContLang;
 373
 374                 $n = $wgContLang->getNsText( $ns );
 375                 if ( '' == $n ) { return $title; }
 376                 else { return $n.':'.$title; }
 377         }
 378
 379         /**
 380          * Returns the URL associated with an interwiki prefix
 381          * @param string $key the interwiki prefix (e.g. "MeatBall")
 382          * @return the associated URL, containing "$1", which should be
 383          *      replaced by an article title
 384          * @static (arguably)
 385          * @access public
 386          */
 387         function getInterwikiLink( $key ) {
 388                 global $wgMemc, $wgDBname, $wgInterwikiExpiry, $wgTitleInterwikiCache;
 389                 $fname = 'Title::getInterwikiLink';
 390
 391                 wfProfileIn( $fname );
 392
 393                 $k = $wgDBname.':interwiki:'.$key;
 394                 if( array_key_exists( $k, $wgTitleInterwikiCache ) ) {
 395                         wfProfileOut( $fname );
 396                         return $wgTitleInterwikiCache[$k]->iw_url;
 397                 }
 398
 399                 $s = $wgMemc->get( $k );
 400                 # Ignore old keys with no iw_local
 401                 if( $s && isset( $s->iw_local ) ) {
 402                         $wgTitleInterwikiCache[$k] = $s;
 403                         wfProfileOut( $fname );
 404                         return $s->iw_url;
 405                 }
 406
 407                 $dbr =& wfGetDB( DB_SLAVE );
 408                 $res = $dbr->select( 'interwiki',
 409                         array( 'iw_url', 'iw_local' ),
 410                         array( 'iw_prefix' => $key ), $fname );
 411                 if( !$res ) {
 412                         wfProfileOut( $fname );
 413                         return '';
 414                 }
 415
 416                 $s = $dbr->fetchObject( $res );
 417                 if( !$s ) {
 418                         # Cache non-existence: create a blank object and save it to memcached
 419                         $s = (object)false;
 420                         $s->iw_url = '';
 421                         $s->iw_local = 0;
 422                 }
 423                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 424                 $wgTitleInterwikiCache[$k] = $s;
 425
 426                 wfProfileOut( $fname );
 427                 return $s->iw_url;
 428         }
 429
 430         /**
 431          * Determine whether the object refers to a page within
 432          * this project.
 433          *
 434          * @return bool TRUE if this is an in-project interwiki link
 435          *      or a wikilink, FALSE otherwise
 436          * @access public
 437          */
 438         function isLocal() {
 439                 global $wgTitleInterwikiCache, $wgDBname;
 440
 441                 if ( $this->mInterwiki != '' ) {
 442                         # Make sure key is loaded into cache
 443                         $this->getInterwikiLink( $this->mInterwiki );
 444                         $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 445                         return (bool)($wgTitleInterwikiCache[$k]->iw_local);
 446                 } else {
 447                         return true;
 448                 }
 449         }
 450
 451         /**
 452          * Update the page_touched field for an array of title objects
 453          * @todo Inefficient unless the IDs are already loaded into the
 454          *      link cache
 455          * @param array $titles an array of Title objects to be touched
 456          * @param string $timestamp the timestamp to use instead of the
 457          *      default current time
 458          * @static
 459          * @access public
 460          */
 461         /* static */ function touchArray( $titles, $timestamp = '' ) {
 462                 if ( count( $titles ) == 0 ) {
 463                         return;
 464                 }
 465                 $dbw =& wfGetDB( DB_MASTER );
 466                 if ( $timestamp == '' ) {
 467                         $timestamp = $dbw->timestamp();
 468                 }
 469                 $page = $dbw->tableName( 'page' );
 470                 $sql = "UPDATE $page SET page_touched='{$timestamp}' WHERE page_id IN (";
 471                 $first = true;
 472
 473                 foreach ( $titles as $title ) {
 474                         if ( ! $first ) {
 475                                 $sql .= ',';
 476                         }
 477                         $first = false;
 478                         $sql .= $title->getArticleID();
 479                 }
 480                 $sql .= ')';
 481                 if ( ! $first ) {
 482                         $dbw->query( $sql, 'Title::touchArray' );
 483                 }
 484         }
 485
 486 #----------------------------------------------------------------------------
 487 #       Other stuff
 488 #----------------------------------------------------------------------------
 489
 490         /** Simple accessors */
 491         /**
 492          * Get the text form (spaces not underscores) of the main part
 493          * @return string
 494          * @access public
 495          */
 496         function getText() { return $this->mTextform; }
 497         /**
 498          * Get the URL-encoded form of the main part
 499          * @return string
 500          * @access public
 501          */
 502         function getPartialURL() { return $this->mUrlform; }
 503         /**
 504          * Get the main part with underscores
 505          * @return string
 506          * @access public
 507          */
 508         function getDBkey() { return $this->mDbkeyform; }
 509         /**
 510          * Get the namespace index, i.e. one of the NS_xxxx constants
 511          * @return int
 512          * @access public
 513          */
 514         function getNamespace() { return $this->mNamespace; }
 515         /**
 516          * Get the interwiki prefix (or null string)
 517          * @return string
 518          * @access public
 519          */
 520         function getInterwiki() { return $this->mInterwiki; }
 521         /**
 522          * Get the Title fragment (i.e. the bit after the #)
 523          * @return string
 524          * @access public
 525          */
 526         function getFragment() { return $this->mFragment; }
 527         /**
 528          * Get the default namespace index, for when there is no namespace
 529          * @return int
 530          * @access public
 531          */
 532         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 533
 534         /**
 535          * Get title for search index
 536          * @return string a stripped-down title string ready for the
 537          *      search index
 538          */
 539         function getIndexTitle() {
 540                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 541         }
 542
 543         /**
 544          * Get the prefixed database key form
 545          * @return string the prefixed title, with underscores and
 546          *      any interwiki and namespace prefixes
 547          * @access public
 548          */
 549         function getPrefixedDBkey() {
 550                 $s = $this->prefix( $this->mDbkeyform );
 551                 $s = str_replace( ' ', '_', $s );
 552                 return $s;
 553         }
 554
 555         /**
 556          * Get the prefixed title with spaces.
 557          * This is the form usually used for display
 558          * @return string the prefixed title, with spaces
 559          * @access public
 560          */
 561         function getPrefixedText() {
 562                 global $wgContLang;
 563                 if ( empty( $this->mPrefixedText ) ) {
 564                         $s = $this->prefix( $this->mTextform );
 565                         $s = str_replace( '_', ' ', $s );
 566                         $this->mPrefixedText = $s;
 567                 }
 568                 return $this->mPrefixedText;
 569         }
 570
 571         /**
 572          * Get the prefixed title with spaces, plus any fragment
 573          * (part beginning with '#')
 574          * @return string the prefixed title, with spaces and
 575          *      the fragment, including '#'
 576          * @access public
 577          */
 578         function getFullText() {
 579                 global $wgContLang;
 580                 $text = $this->getPrefixedText();
 581                 if( '' != $this->mFragment ) {
 582                         $text .= '#' . $this->mFragment;
 583                 }
 584                 return $text;
 585         }
 586
 587         /**
 588          * Get a URL-encoded title (not an actual URL) including interwiki
 589          * @return string the URL-encoded form
 590          * @access public
 591          */
 592         function getPrefixedURL() {
 593                 $s = $this->prefix( $this->mDbkeyform );
 594                 $s = str_replace( ' ', '_', $s );
 595
 596                 $s = wfUrlencode ( $s ) ;
 597
 598                 # Cleaning up URL to make it look nice -- is this safe?
 599                 $s = str_replace( '%28', '(', $s );
 600                 $s = str_replace( '%29', ')', $s );
 601
 602                 return $s;
 603         }
 604
 605         /**
 606          * Get a real URL referring to this title, with interwiki link and
 607          * fragment
 608          *
 609          * @param string $query an optional query string, not used
 610          *      for interwiki links
 611          * @return string the URL
 612          * @access public
 613          */
 614         function getFullURL( $query = '' ) {
 615                 global $wgContLang, $wgArticlePath, $wgServer, $wgScript;
 616
 617                 if ( '' == $this->mInterwiki ) {
 618                         $p = $wgArticlePath;
 619                         return $wgServer . $this->getLocalUrl( $query );
 620                 } else {
 621                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 622                         $namespace = $wgContLang->getNsText( $this->mNamespace );
 623                         if ( '' != $namespace ) {
 624                                 # Can this actually happen? Interwikis shouldn't be parsed.
 625                                 $namepace .= ':';
 626                         }
 627                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 628                         if ( '' != $this->mFragment ) {
 629                                 $url .= '#' . $this->mFragment;
 630                         }
 631                         return $url;
 632                 }
 633         }
 634
 635         /**
 636          * Get a URL with no fragment or server name
 637          * @param string $query an optional query string; if not specified,
 638          *      $wgArticlePath will be used.
 639          * @return string the URL
 640          * @access public
 641          */
 642         function getLocalURL( $query = '' ) {
 643                 global $wgLang, $wgArticlePath, $wgScript;
 644
 645                 if ( $this->isExternal() ) {
 646                         return $this->getFullURL();
 647                 }
 648
 649                 $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 650                 if ( $query == '' ) {
 651                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 652                 } else {
 653                         if ( $query == '-' ) {
 654                                 $query = '';
 655                         }
 656                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 657                 }
 658                 return $url;
 659         }
 660
 661         /**
 662          * Get an HTML-escaped version of the URL form, suitable for
 663          * using in a link, without a server name or fragment
 664          * @param string $query an optional query string
 665          * @return string the URL
 666          * @access public
 667          */
 668         function escapeLocalURL( $query = '' ) {
 669                 return htmlspecialchars( $this->getLocalURL( $query ) );
 670         }
 671
 672         /**
 673          * Get an HTML-escaped version of the URL form, suitable for
 674          * using in a link, including the server name and fragment
 675          *
 676          * @return string the URL
 677          * @param string $query an optional query string
 678          * @access public
 679          */
 680         function escapeFullURL( $query = '' ) {
 681                 return htmlspecialchars( $this->getFullURL( $query ) );
 682         }
 683
 684         /**
 685          * Get the URL form for an internal link.
 686          * - Used in various Squid-related code, in case we have a different
 687          * internal hostname for the server from the exposed one.
 688          *
 689          * @param string $query an optional query string
 690          * @return string the URL
 691          * @access public
 692          */
 693         function getInternalURL( $query = '' ) {
 694                 global $wgInternalServer;
 695                 return $wgInternalServer . $this->getLocalURL( $query );
 696         }
 697
 698         /**
 699          * Get the edit URL for this Title
 700          * @return string the URL, or a null string if this is an
 701          *      interwiki link
 702          * @access public
 703          */
 704         function getEditURL() {
 705                 global $wgServer, $wgScript;
 706
 707                 if ( '' != $this->mInterwiki ) { return ''; }
 708                 $s = $this->getLocalURL( 'action=edit' );
 709
 710                 return $s;
 711         }
 712
 713         /**
 714          * Get the HTML-escaped displayable text form.
 715          * Used for the title field in <a> tags.
 716          * @return string the text, including any prefixes
 717          * @access public
 718          */
 719         function getEscapedText() {
 720                 return htmlspecialchars( $this->getPrefixedText() );
 721         }
 722
 723         /**
 724          * Is this Title interwiki?
 725          * @return boolean
 726          * @access public
 727          */
 728         function isExternal() { return ( '' != $this->mInterwiki ); }
 729
 730         /**
 731          * Does the title correspond to a protected article?
 732          * @param string $what the action the page is protected from,
 733          *      by default checks move and edit
 734          * @return boolean
 735          * @access public
 736          */
 737         function isProtected($action = '') {
 738                 if ( -1 == $this->mNamespace ) { return true; }
 739                 if($action == 'edit' || $action == '') {
 740                         $a = $this->getRestrictions("edit");
 741                         if ( in_array( 'sysop', $a ) ) { return true; }
 742                 }
 743                 if($action == 'move' || $action == '') {
 744                         $a = $this->getRestrictions("move");
 745                         if ( in_array( 'sysop', $a ) ) { return true; }
 746                 }
 747                 return false;
 748         }
 749
 750         /**
 751          * Is $wgUser is watching this page?
 752          * @return boolean
 753          * @access public
 754          */
 755         function userIsWatching() {
 756                 global $wgUser;
 757
 758                 if ( -1 == $this->mNamespace ) { return false; }
 759                 if ( 0 == $wgUser->getID() ) { return false; }
 760
 761                 return $wgUser->isWatched( $this );
 762         }
 763
 764         /**
 765          * Is $wgUser perform $action this page?
 766          * @param string $action action that permission needs to be checked for
 767          * @return boolean
 768          * @access private
 769          */
 770         function userCan($action) {
 771                 $fname = 'Title::userCanEdit';
 772                 wfProfileIn( $fname );
 773
 774                 global $wgUser;
 775                 if( NS_SPECIAL == $this->mNamespace ) {
 776                         wfProfileOut( $fname );
 777                         return false;
 778                 }
 779                 if( NS_MEDIAWIKI == $this->mNamespace &&
 780                     !$wgUser->isAllowed('editinterface') ) {
 781                         wfProfileOut( $fname );
 782                         return false;
 783                 }
 784                 if( $this->mDbkeyform == '_' ) {
 785                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
 786                         wfProfileOut( $fname );
 787                         return false;
 788                 }
 789
 790                 # protect global styles and js
 791                 if ( NS_MEDIAWIKI == $this->mNamespace
 792                  && preg_match("/\\.(css|js)$/", $this->mTextform )
 793                      && !$wgUser->isAllowed('editinterface') ) {
 794                         wfProfileOut( $fname );
 795                         return false;
 796                 }
 797
 798                 # protect css/js subpages of user pages
 799                 # XXX: this might be better using restrictions
 800                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
 801                 if( NS_USER == $this->mNamespace
 802                         && preg_match("/\\.(css|js)$/", $this->mTextform )
 803                         && !$wgUser->isAllowed('editinterface')
 804                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
 805                         wfProfileOut( $fname );
 806                         return false;
 807                 }
 808
 809                 foreach( $this->getRestrictions($action) as $right ) {
 810                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
 811                                 wfProfileOut( $fname );
 812                                 return false;
 813                         }
 814                 }
 815                 wfProfileOut( $fname );
 816                 return true;
 817         }
 818
 819         /**
 820          * Can $wgUser edit this page?
 821          * @return boolean
 822          * @access public
 823          */
 824         function userCanEdit() {
 825                 return $this->userCan('edit');
 826         }
 827
 828         /**
 829          * Can $wgUser move this page?
 830          * @return boolean
 831          * @access public
 832          */
 833         function userCanMove() {
 834                 return $this->userCan('move');
 835         }
 836
 837         /**
 838          * Can $wgUser read this page?
 839          * @return boolean
 840          * @access public
 841          */
 842         function userCanRead() {
 843                 global $wgUser;
 844
 845                 if( $wgUser->isAllowed('read') ) {
 846                         return true;
 847                 } else {
 848                         global $wgWhitelistRead;
 849
 850                         /** If anon users can create an account,
 851                             they need to reach the login page first! */
 852                         if( $wgUser->isAllowed( 'createaccount' )
 853                             && $this->mId == NS_SPECIAL
 854                             && $this->getText() == 'Userlogin' ) {
 855                                 return true;
 856                         }
 857
 858                         /** some pages are explicitly allowed */
 859                         $name = $this->getPrefixedText();
 860                         if( in_array( $name, $wgWhitelistRead ) ) {
 861                                 return true;
 862                         }
 863
 864                         # Compatibility with old settings
 865                         if( $this->getNamespace() == NS_MAIN ) {
 866                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
 867                                         return true;
 868                                 }
 869                         }
 870                 }
 871                 return false;
 872         }
 873
 874         /**
 875          * Is this a .css or .js subpage of a user page?
 876          * @return bool
 877          * @access public
 878          */
 879         function isCssJsSubpage() {
 880                 return ( NS_USER == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
 881         }
 882         /**
 883          * Is this a .css subpage of a user page?
 884          * @return bool
 885          * @access public
 886          */
 887         function isCssSubpage() {
 888                 return ( NS_USER == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
 889         }
 890         /**
 891          * Is this a .js subpage of a user page?
 892          * @return bool
 893          * @access public
 894          */
 895         function isJsSubpage() {
 896                 return ( NS_USER == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
 897         }
 898         /**
 899          * Protect css/js subpages of user pages: can $wgUser edit
 900          * this page?
 901          *
 902          * @return boolean
 903          * @todo XXX: this might be better using restrictions
 904          * @access public
 905          */
 906         function userCanEditCssJsSubpage() {
 907                 global $wgUser;
 908                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
 909         }
 910
 911         /**
 912          * Loads a string into mRestrictions array
 913          * @param string $res restrictions in string format
 914          * @access public
 915          */
 916         function loadRestrictions( $res ) {
 917                 foreach( explode( ':', trim( $res ) ) as $restrict ) {
 918                         $temp = explode( '=', trim( $restrict ) );
 919                         if(count($temp) == 1) {
 920                                 // old format should be treated as edit/move restriction
 921                                 $this->mRestrictions["edit"] = explode( ',', trim( $temp[0] ) );
 922                                 $this->mRestrictions["move"] = explode( ',', trim( $temp[0] ) );
 923                         } else {
 924                                 $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
 925                         }
 926                 }
 927                 $this->mRestrictionsLoaded = true;
 928         }
 929
 930         /**
 931          * Accessor/initialisation for mRestrictions
 932          * @param string $action action that permission needs to be checked for
 933          * @return array the array of groups allowed to edit this article
 934          * @access public
 935          */
 936         function getRestrictions($action) {
 937                 $id = $this->getArticleID();
 938                 if ( 0 == $id ) { return array(); }
 939
 940                 if ( ! $this->mRestrictionsLoaded ) {
 941                         $dbr =& wfGetDB( DB_SLAVE );
 942                         $res = $dbr->selectField( 'page', 'page_restrictions', 'page_id='.$id );
 943                         $this->loadRestrictions( $res );
 944                 }
 945                 if( isset( $this->mRestrictions[$action] ) ) {
 946                         return $this->mRestrictions[$action];
 947                 }
 948                 return array();
 949         }
 950
 951         /**
 952          * Is there a version of this page in the deletion archive?
 953          * @return int the number of archived revisions
 954          * @access public
 955          */
 956         function isDeleted() {
 957                 $fname = 'Title::isDeleted';
 958                 $dbr =& wfGetDB( DB_SLAVE );
 959                 $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
 960                         'ar_title' => $this->getDBkey() ), $fname );
 961                 return (int)$n;
 962         }
 963
 964         /**
 965          * Get the article ID for this Title from the link cache,
 966          * adding it if necessary
 967          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
 968          *      for update
 969          * @return int the ID
 970          * @access public
 971          */
 972         function getArticleID( $flags = 0 ) {
 973                 global $wgLinkCache;
 974
 975                 if ( $flags & GAID_FOR_UPDATE ) {
 976                         $oldUpdate = $wgLinkCache->forUpdate( true );
 977                         $this->mArticleID = $wgLinkCache->addLinkObj( $this );
 978                         $wgLinkCache->forUpdate( $oldUpdate );
 979                 } else {
 980                         if ( -1 == $this->mArticleID ) {
 981                                 $this->mArticleID = $wgLinkCache->addLinkObj( $this );
 982                         }
 983                 }
 984                 return $this->mArticleID;
 985         }
 986
 987         /**
 988          * This clears some fields in this object, and clears any associated
 989          * keys in the "bad links" section of $wgLinkCache.
 990          *
 991          * - This is called from Article::insertNewArticle() to allow
 992          * loading of the new page_id. It's also called from
 993          * Article::doDeleteArticle()
 994          *
 995          * @param int $newid the new Article ID
 996          * @access public
 997          */
 998         function resetArticleID( $newid ) {
 999                 global $wgLinkCache;
1000                 $wgLinkCache->clearBadLink( $this->getPrefixedDBkey() );
1001
1002                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1003                 else { $this->mArticleID = $newid; }
1004                 $this->mRestrictionsLoaded = false;
1005                 $this->mRestrictions = array();
1006         }
1007
1008         /**
1009          * Updates page_touched for this page; called from LinksUpdate.php
1010          * @return bool true if the update succeded
1011          * @access public
1012          */
1013         function invalidateCache() {
1014                 $now = wfTimestampNow();
1015                 $dbw =& wfGetDB( DB_MASTER );
1016                 $success = $dbw->update( 'page',
1017                         array( /* SET */
1018                                 'page_touched' => $dbw->timestamp()
1019                         ), array( /* WHERE */
1020                                 'page_namespace' => $this->getNamespace() ,
1021                                 'page_title' => $this->getDBkey()
1022                         ), 'Title::invalidateCache'
1023                 );
1024                 return $success;
1025         }
1026
1027         /**
1028          * Prefix some arbitrary text with the namespace or interwiki prefix
1029          * of this object
1030          *
1031          * @param string $name the text
1032          * @return string the prefixed text
1033          * @access private
1034          */
1035         /* private */ function prefix( $name ) {
1036                 global $wgContLang;
1037
1038                 $p = '';
1039                 if ( '' != $this->mInterwiki ) {
1040                         $p = $this->mInterwiki . ':';
1041                 }
1042                 if ( 0 != $this->mNamespace ) {
1043                         $p .= $wgContLang->getNsText( $this->mNamespace ) . ':';
1044                 }
1045                 return $p . $name;
1046         }
1047
1048         /**
1049          * Secure and split - main initialisation function for this object
1050          *
1051          * Assumes that mDbkeyform has been set, and is urldecoded
1052          * and uses underscores, but not otherwise munged.  This function
1053          * removes illegal characters, splits off the interwiki and
1054          * namespace prefixes, sets the other forms, and canonicalizes
1055          * everything.
1056          * @return bool true on success
1057          * @access private
1058          */
1059         /* private */ function secureAndSplit() {
1060                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1061                 $fname = 'Title::secureAndSplit';
1062                 wfProfileIn( $fname );
1063
1064                 # Initialisation
1065                 static $rxTc = false;
1066                 if( !$rxTc ) {
1067                         # % is needed as well
1068                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/S';
1069                 }
1070
1071                 $this->mInterwiki = $this->mFragment = '';
1072                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1073
1074                 # Clean up whitespace
1075                 #
1076                 $t = preg_replace( '/[ _]+/', '_', $this->mDbkeyform );
1077                 $t = trim( $t, '_' );
1078
1079                 if ( '' == $t ) {
1080                         wfProfileOut( $fname );
1081                         return false;
1082                 }
1083
1084                 global $wgUseLatin1;
1085                 if( !$wgUseLatin1 && false !== strpos( $t, UTF8_REPLACEMENT ) ) {
1086                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1087                         wfProfileOut( $fname );
1088                         return false;
1089                 }
1090
1091                 $this->mDbkeyform = $t;
1092
1093                 # Initial colon indicating main namespace
1094                 if ( ':' == $t{0} ) {
1095                         $r = substr( $t, 1 );
1096                         $this->mNamespace = NS_MAIN;
1097                 } else {
1098                         # Namespace or interwiki prefix
1099                         $firstPass = true;
1100                         do {
1101                                 if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $t, $m ) ) {
1102                                         $p = $m[1];
1103                                         $lowerNs = strtolower( $p );
1104                                         if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1105                                                 # Canonical namespace
1106                                                 $t = $m[2];
1107                                                 $this->mNamespace = $ns;
1108                                         } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1109                                                 # Ordinary namespace
1110                                                 $t = $m[2];
1111                                                 $this->mNamespace = $ns;
1112                                         } elseif( $this->getInterwikiLink( $p ) ) {
1113                                                 if( !$firstPass ) {
1114                                                         # Can't make a local interwiki link to an interwiki link.
1115                                                         # That's just crazy!
1116                                                         wfProfileOut( $fname );
1117                                                         return false;
1118                                                 }
1119
1120                                                 # Interwiki link
1121                                                 $t = $m[2];
1122                                                 $this->mInterwiki = $p;
1123
1124                                                 # Redundant interwiki prefix to the local wiki
1125                                                 if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1126                                                         if( $t == '' ) {
1127                                                                 # Can't have an empty self-link
1128                                                                 wfProfileOut( $fname );
1129                                                                 return false;
1130                                                         }
1131                                                         $this->mInterwiki = '';
1132                                                         $firstPass = false;
1133                                                         # Do another namespace split...
1134                                                         continue;
1135                                                 }
1136                                         }
1137                                         # If there's no recognized interwiki or namespace,
1138                                         # then let the colon expression be part of the title.
1139                                 }
1140                                 break;
1141                         } while( true );
1142                         $r = $t;
1143                 }
1144
1145                 # We already know that some pages won't be in the database!
1146                 #
1147                 if ( '' != $this->mInterwiki || -1 == $this->mNamespace ) {
1148                         $this->mArticleID = 0;
1149                 }
1150                 $f = strstr( $r, '#' );
1151                 if ( false !== $f ) {
1152                         $this->mFragment = substr( $f, 1 );
1153                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
1154                         # remove whitespace again: prevents "Foo_bar_#"
1155                         # becoming "Foo_bar_"
1156                         $r = preg_replace( '/_*$/', '', $r );
1157                 }
1158
1159                 # Reject illegal characters.
1160                 #
1161                 if( preg_match( $rxTc, $r ) ) {
1162                         wfProfileOut( $fname );
1163                         return false;
1164                 }
1165
1166                 /**
1167                  * Pages with "/./" or "/../" appearing in the URLs will
1168                  * often be unreachable due to the way web browsers deal
1169                  * with 'relative' URLs. Forbid them explicitly.
1170                  */
1171                 if ( strpos( $r, '.' ) !== false &&
1172                      ( $r === '.' || $r === '..' ||
1173                        strpos( $r, './' ) === 0  ||
1174                        strpos( $r, '../' ) === 0 ||
1175                        strpos( $r, '/./' ) !== false ||
1176                        strpos( $r, '/../' ) !== false ) )
1177                 {
1178                         wfProfileOut( $fname );
1179                         return false;
1180                 }
1181
1182                 # We shouldn't need to query the DB for the size.
1183                 #$maxSize = $dbr->textFieldSize( 'page', 'page_title' );
1184                 if ( strlen( $r ) > 255 ) {
1185                         wfProfileOut( $fname );
1186                         return false;
1187                 }
1188
1189                 /**
1190                  * Normally, all wiki links are forced to have
1191                  * an initial capital letter so [[foo]] and [[Foo]]
1192                  * point to the same place.
1193                  *
1194                  * Don't force it for interwikis, since the other
1195                  * site might be case-sensitive.
1196                  */
1197                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1198                         $t = $wgContLang->ucfirst( $r );
1199                 } else {
1200                         $t = $r;
1201                 }
1202
1203                 /**
1204                  * Can't make a link to a namespace alone...
1205                  * "empty" local links can only be self-links
1206                  * with a fragment identifier.
1207                  */
1208                 if( $t == '' &&
1209                         $this->mInterwiki == '' &&
1210                         $this->mNamespace != NS_MAIN ) {
1211                         wfProfileOut( $fname );
1212                         return false;
1213                 }
1214
1215                 # Fill fields
1216                 $this->mDbkeyform = $t;
1217                 $this->mUrlform = wfUrlencode( $t );
1218
1219                 $this->mTextform = str_replace( '_', ' ', $t );
1220
1221                 wfProfileOut( $fname );
1222                 return true;
1223         }
1224
1225         /**
1226          * Get a Title object associated with the talk page of this article
1227          * @return Title the object for the talk page
1228          * @access public
1229          */
1230         function getTalkPage() {
1231                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1232         }
1233
1234         /**
1235          * Get a title object associated with the subject page of this
1236          * talk page
1237          *
1238          * @return Title the object for the subject page
1239          * @access public
1240          */
1241         function getSubjectPage() {
1242                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1243         }
1244
1245         /**
1246          * Get an array of Title objects linking to this Title
1247          * - Also stores the IDs in the link cache.
1248          *
1249          * @param string $options may be FOR UPDATE
1250          * @return array the Title objects linking here
1251          * @access public
1252          */
1253         function getLinksTo( $options = '' ) {
1254                 global $wgLinkCache;
1255                 $id = $this->getArticleID();
1256
1257                 if ( $options ) {
1258                         $db =& wfGetDB( DB_MASTER );
1259                 } else {
1260                         $db =& wfGetDB( DB_SLAVE );
1261                 }
1262                 $page = $db->tableName( 'page' );
1263                 $links = $db->tableName( 'links' );
1264
1265                 $sql = "SELECT page_namespace,page_title,page_id FROM $page,$links WHERE l_from=page_id AND l_to={$id} $options";
1266                 $res = $db->query( $sql, 'Title::getLinksTo' );
1267                 $retVal = array();
1268                 if ( $db->numRows( $res ) ) {
1269                         while ( $row = $db->fetchObject( $res ) ) {
1270                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1271                                         $wgLinkCache->addGoodLink( $row->page_id, $titleObj->getPrefixedDBkey() );
1272                                         $retVal[] = $titleObj;
1273                                 }
1274                         }
1275                 }
1276                 $db->freeResult( $res );
1277                 return $retVal;
1278         }
1279
1280         /**
1281          * Get an array of Title objects linking to this non-existent title.
1282          * - Also stores the IDs in the link cache.
1283          *
1284          * @param string $options may be FOR UPDATE
1285          * @return array the Title objects linking here
1286          * @access public
1287          */
1288         function getBrokenLinksTo( $options = '' ) {
1289                 global $wgLinkCache;
1290
1291                 if ( $options ) {
1292                         $db =& wfGetDB( DB_MASTER );
1293                 } else {
1294                         $db =& wfGetDB( DB_SLAVE );
1295                 }
1296                 $page = $db->tableName( 'page' );
1297                 $brokenlinks = $db->tableName( 'brokenlinks' );
1298                 $encTitle = $db->strencode( $this->getPrefixedDBkey() );
1299
1300                 $sql = "SELECT page_namespace,page_title,page_id FROM $brokenlinks,$page " .
1301                   "WHERE bl_from=page_id AND bl_to='$encTitle' $options";
1302                 $res = $db->query( $sql, "Title::getBrokenLinksTo" );
1303                 $retVal = array();
1304                 if ( $db->numRows( $res ) ) {
1305                         while ( $row = $db->fetchObject( $res ) ) {
1306                                 $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title );
1307                                 $wgLinkCache->addGoodLink( $row->page_id, $titleObj->getPrefixedDBkey() );
1308                                 $retVal[] = $titleObj;
1309                         }
1310                 }
1311                 $db->freeResult( $res );
1312                 return $retVal;
1313         }
1314
1315         /**
1316          * Get a list of URLs to purge from the Squid cache when this
1317          * page changes
1318          *
1319          * @return array the URLs
1320          * @access public
1321          */
1322         function getSquidURLs() {
1323                 return array(
1324                         $this->getInternalURL(),
1325                         $this->getInternalURL( 'action=history' )
1326                 );
1327         }
1328
1329         /**
1330          * Move this page without authentication
1331          * @param Title &$nt the new page Title
1332          * @access public
1333          */
1334         function moveNoAuth( &$nt ) {
1335                 return $this->moveTo( $nt, false );
1336         }
1337
1338         /**
1339          * Move a title to a new location
1340          * @param Title &$nt the new title
1341          * @param bool $auth indicates whether $wgUser's permissions
1342          *      should be checked
1343          * @return mixed true on success, message name on failure
1344          * @access public
1345          */
1346         function moveTo( &$nt, $auth = true ) {
1347                 if( !$this or !$nt ) {
1348                         return 'badtitletext';
1349                 }
1350
1351                 $fname = 'Title::move';
1352                 $oldid = $this->getArticleID();
1353                 $newid = $nt->getArticleID();
1354
1355                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1356                         return 'articleexists';
1357                 }
1358                 if ( ( ! Namespace::isMovable( $this->getNamespace() ) ) ||
1359                          ( '' == $this->getDBkey() ) ||
1360                          ( '' != $this->getInterwiki() ) ||
1361                          ( !$oldid ) ||
1362                      ( ! Namespace::isMovable( $nt->getNamespace() ) ) ||
1363                          ( '' == $nt->getDBkey() ) ||
1364                          ( '' != $nt->getInterwiki() ) ) {
1365                         return 'badarticleerror';
1366                 }
1367
1368                 if ( $auth && (
1369                                 !$this->userCanEdit() || !$nt->userCanEdit() ||
1370                                 !$this->userCanMove() || !$nt->userCanMove() ) ) {
1371                         return 'protectedpage';
1372                 }
1373
1374                 # The move is allowed only if (1) the target doesn't exist, or
1375                 # (2) the target is a redirect to the source, and has no history
1376                 # (so we can undo bad moves right after they're done).
1377
1378                 if ( 0 != $newid ) { # Target exists; check for validity
1379                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1380                                 return 'articleexists';
1381                         }
1382                         $this->moveOverExistingRedirect( $nt );
1383                 } else { # Target didn't exist, do normal move.
1384                         $this->moveToNewTitle( $nt, $newid );
1385                 }
1386
1387                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
1388
1389                 $dbw =& wfGetDB( DB_MASTER );
1390                 $categorylinks = $dbw->tableName( 'categorylinks' );
1391                 $sql = "UPDATE $categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
1392                         " WHERE cl_from=" . $dbw->addQuotes( $this->getArticleID() ) .
1393                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
1394                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
1395
1396                 # Update watchlists
1397
1398                 $oldnamespace = $this->getNamespace() & ~1;
1399                 $newnamespace = $nt->getNamespace() & ~1;
1400                 $oldtitle = $this->getDBkey();
1401                 $newtitle = $nt->getDBkey();
1402
1403                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
1404                         WatchedItem::duplicateEntries( $this, $nt );
1405                 }
1406
1407                 # Update search engine
1408                 $u = new SearchUpdate( $oldid, $nt->getPrefixedDBkey() );
1409                 $u->doUpdate();
1410                 $u = new SearchUpdate( $newid, $this->getPrefixedDBkey(), '' );
1411                 $u->doUpdate();
1412
1413                 wfRunHooks( 'TitleMoveComplete', $this, $nt, $wgUser, $oldid, $newid );
1414                 return true;
1415         }
1416
1417         /**
1418          * Move page to a title which is at present a redirect to the
1419          * source page
1420          *
1421          * @param Title &$nt the page to move to, which should currently
1422          *      be a redirect
1423          * @access private
1424          */
1425         /* private */ function moveOverExistingRedirect( &$nt ) {
1426                 global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
1427                 $fname = 'Title::moveOverExistingRedirect';
1428                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1429
1430                 $now = wfTimestampNow();
1431                 $won = wfInvertTimestamp( $now );
1432                 $rand = wfRandom();
1433                 $newid = $nt->getArticleID();
1434                 $oldid = $this->getArticleID();
1435                 $dbw =& wfGetDB( DB_MASTER );
1436                 $links = $dbw->tableName( 'links' );
1437
1438                 # Delete the old redirect. We don't save it to history since
1439                 # by definition if we've got here it's rather uninteresting.
1440                 # We have to remove it so that the next step doesn't trigger
1441                 # a conflict on the unique namespace+title index...
1442                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
1443
1444                 # Change the name of the target page:
1445                 $dbw->update( 'page',
1446                         /* SET */ array(
1447                                 'page_touched' => $dbw->timestamp($now),
1448                                 'page_namespace' => $nt->getNamespace(),
1449                                 'page_title' => $nt->getDBkey()
1450                         ),
1451                         /* WHERE */ array( 'page_id' => $oldid ),
1452                         $fname
1453                 );
1454                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1455
1456                 # Recreate the redirect, this time in the other direction.
1457                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1458                 $dbw->insert( 'revision', array(
1459                         'rev_id' => $dbw->nextSequenceValue('rev_rev_id_seq'),
1460                         'rev_comment' => $comment,
1461                         'rev_user' => $wgUser->getID(),
1462                         'rev_user_text' => $wgUser->getName(),
1463                         'rev_timestamp' => $now,
1464                         'inverse_timestamp' => $won ), $fname
1465                 );
1466                 $revid = $dbw->insertId();
1467                 $dbw->insert( 'text', array(
1468                         'old_id' => $revid,
1469                         'old_flags' => '',
1470                         'old_text' => $redirectText,
1471                         ), $fname
1472                 );
1473                 $dbw->insert( 'page', array(
1474                         'page_id' => $dbw->nextSequenceValue('page_page_id_seq'),
1475                         'page_namespace' => $this->getNamespace(),
1476                         'page_title' => $this->getDBkey(),
1477                         'page_touched' => $now,
1478                         'page_is_redirect' => 1,
1479                         'page_random' => $rand,
1480                         'page_is_new' => 1,
1481                         'page_latest' => $revid), $fname
1482                 );
1483                 $newid = $dbw->insertId();
1484                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1485
1486                 RecentChange::notifyMoveOverRedirect( $now, $this, $nt, $wgUser, $comment );
1487
1488                 # Swap links
1489
1490                 # Load titles and IDs
1491                 $linksToOld = $this->getLinksTo( 'FOR UPDATE' );
1492                 $linksToNew = $nt->getLinksTo( 'FOR UPDATE' );
1493
1494                 # Delete them all
1495                 $sql = "DELETE FROM $links WHERE l_to=$oldid OR l_to=$newid";
1496                 $dbw->query( $sql, $fname );
1497
1498                 # Reinsert
1499                 if ( count( $linksToOld ) || count( $linksToNew )) {
1500                         $sql = "INSERT INTO $links (l_from,l_to) VALUES ";
1501                         $first = true;
1502
1503                         # Insert links to old title
1504                         foreach ( $linksToOld as $linkTitle ) {
1505                                 if ( $first ) {
1506                                         $first = false;
1507                                 } else {
1508                                         $sql .= ',';
1509                                 }
1510                                 $id = $linkTitle->getArticleID();
1511                                 $sql .= "($id,$newid)";
1512                         }
1513
1514                         # Insert links to new title
1515                         foreach ( $linksToNew as $linkTitle ) {
1516                                 if ( $first ) {
1517                                         $first = false;
1518                                 } else {
1519                                         $sql .= ',';
1520                                 }
1521                                 $id = $linkTitle->getArticleID();
1522                                 $sql .= "($id, $oldid)";
1523                         }
1524
1525                         $dbw->query( $sql, DB_MASTER, $fname );
1526                 }
1527
1528                 # Now, we record the link from the redirect to the new title.
1529                 # It should have no other outgoing links...
1530                 $dbw->delete( 'links', array( 'l_from' => $newid ) );
1531                 $dbw->insert( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ) );
1532
1533                 # Clear linkscc
1534                 LinkCache::linksccClearLinksTo( $oldid );
1535                 LinkCache::linksccClearLinksTo( $newid );
1536
1537                 # Purge squid
1538                 if ( $wgUseSquid ) {
1539                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1540                         $u = new SquidUpdate( $urls );
1541                         $u->doUpdate();
1542                 }
1543         }
1544
1545         /**
1546          * Move page to non-existing title.
1547          * @param Title &$nt the new Title
1548          * @param int &$newid set to be the new article ID
1549          * @access private
1550          */
1551         /* private */ function moveToNewTitle( &$nt, &$newid ) {
1552                 global $wgUser, $wgLinkCache, $wgUseSquid;
1553                 global $wgMwRedir;
1554                 $fname = 'MovePageForm::moveToNewTitle';
1555                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1556
1557                 $newid = $nt->getArticleID();
1558                 $oldid = $this->getArticleID();
1559                 $dbw =& wfGetDB( DB_MASTER );
1560                 $now = $dbw->timestamp();
1561                 $won = wfInvertTimestamp( wfTimestamp(TS_MW,$now) );
1562                 wfSeedRandom();
1563                 $rand = wfRandom();
1564
1565                 # Rename cur entry
1566                 $dbw->update( 'page',
1567                         /* SET */ array(
1568                                 'page_touched' => $now,
1569                                 'page_namespace' => $nt->getNamespace(),
1570                                 'page_title' => $nt->getDBkey()
1571                         ),
1572                         /* WHERE */ array( 'page_id' => $oldid ),
1573                         $fname
1574                 );
1575
1576                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1577
1578                 # Insert redirect
1579                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1580                 $dbw->insert( 'revision', array(
1581                         'rev_id' => $dbw->nextSequenceValue('rev_rev_id_seq'),
1582                         'rev_comment' => $comment,
1583                         'rev_user' => $wgUser->getID(),
1584                         'rev_user_text' => $wgUser->getName(),
1585                         'rev_timestamp' => $now,
1586                         'inverse_timestamp' => $won ), $fname
1587                 );
1588                 $revid = $dbw->insertId();
1589                 $dbw->insert( 'text', array(
1590                         'old_id' => $revid,
1591                         'old_flags' => '',
1592                         'old_text' => $redirectText
1593                         ), $fname
1594                 );
1595                 $dbw->insert( 'page', array(
1596                         'page_id' => $dbw->nextSequenceValue('page_page_id_seq'),
1597                         'page_namespace' => $this->getNamespace(),
1598                         'page_title' => $this->getDBkey(),
1599                         'page_touched' => $now,
1600                         'page_is_redirect' => 1,
1601                         'page_random' => $rand,
1602                         'page_is_new' => 1,
1603                         'page_latest' => $revid), $fname
1604                 );
1605                 $newid = $dbw->insertId();
1606                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1607
1608                 # Record in RC
1609                 RecentChange::notifyMoveToNew( $now, $this, $nt, $wgUser, $comment );
1610
1611                 # Purge squid and linkscc as per article creation
1612                 Article::onArticleCreate( $nt );
1613
1614                 # Any text links to the old title must be reassigned to the redirect
1615                 $dbw->update( 'links', array( 'l_to' => $newid ), array( 'l_to' => $oldid ), $fname );
1616                 LinkCache::linksccClearLinksTo( $oldid );
1617
1618                 # Record the just-created redirect's linking to the page
1619                 $dbw->insert( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ), $fname );
1620
1621                 # Non-existent target may have had broken links to it; these must
1622                 # now be removed and made into good links.
1623                 $update = new LinksUpdate( $oldid, $nt->getPrefixedDBkey() );
1624                 $update->fixBrokenLinks();
1625
1626                 # Purge old title from squid
1627                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1628                 $titles = $nt->getLinksTo();
1629                 if ( $wgUseSquid ) {
1630                         $urls = $this->getSquidURLs();
1631                         foreach ( $titles as $linkTitle ) {
1632                                 $urls[] = $linkTitle->getInternalURL();
1633                         }
1634                         $u = new SquidUpdate( $urls );
1635                         $u->doUpdate();
1636                 }
1637         }
1638
1639         /**
1640          * Checks if $this can be moved to a given Title
1641          * - Selects for update, so don't call it unless you mean business
1642          *
1643          * @param Title &$nt the new title to check
1644          * @access public
1645          */
1646         function isValidMoveTarget( $nt ) {
1647
1648                 $fname = 'Title::isValidMoveTarget';
1649                 $dbw =& wfGetDB( DB_MASTER );
1650
1651                 # Is it a redirect?
1652                 $id  = $nt->getArticleID();
1653                 $obj = $dbw->selectRow( array( 'page', 'text') ,
1654                         array( 'page_is_redirect','old_text' ),
1655                         array( 'page_id' => $id, 'page_latest=old_id' ),
1656                         $fname, 'FOR UPDATE' );
1657
1658                 if ( !$obj || 0 == $obj->page_is_redirect ) {
1659                         # Not a redirect
1660                         return false;
1661                 }
1662
1663                 # Does the redirect point to the source?
1664                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $obj->old_text, $m ) ) {
1665                         $redirTitle = Title::newFromText( $m[1] );
1666                         if( !is_object( $redirTitle ) ||
1667                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1668                                 return false;
1669                         }
1670                 }
1671
1672                 # Does the article have a history?
1673                 $row = $dbw->selectRow( array( 'page', 'revision'),
1674                         array( 'rev_id' ),
1675                         array( 'page_namespace' => $nt->getNamespace(),
1676                                 'page_title' => $nt->getDBkey(),
1677                                 'page_id=rev_page AND page_latest != rev_id'
1678                         ), $fname, 'FOR UPDATE'
1679                 );
1680
1681                 # Return true if there was no history
1682                 return $row === false;
1683         }
1684
1685         /**
1686          * Create a redirect; fails if the title already exists; does
1687          * not notify RC
1688          *
1689          * @param Title $dest the destination of the redirect
1690          * @param string $comment the comment string describing the move
1691          * @return bool true on success
1692          * @access public
1693          */
1694         function createRedirect( $dest, $comment ) {
1695                 global $wgUser;
1696                 if ( $this->getArticleID() ) {
1697                         return false;
1698                 }
1699
1700                 $fname = 'Title::createRedirect';
1701                 $dbw =& wfGetDB( DB_MASTER );
1702                 $now = wfTimestampNow();
1703                 $won = wfInvertTimestamp( $now );
1704
1705                 $seqVal = $dbw->nextSequenceValue( 'page_page_id_seq' );
1706                 $dbw->insert( 'page', array(
1707                         'page_id' => $seqVal,
1708                         'page_namespace' => $this->getNamespace(),
1709                         'page_title' => $this->getDBkey(),
1710                         'page_touched' => $now,
1711                         'page_is_redirect' => 1,
1712                         'page_is_new' => 1,
1713                         'page_latest' => NULL,
1714                 ), $fname );
1715                 $newid = $dbw->insertId();
1716
1717                 $seqVal = $dbw->nextSequenceValue( 'text_old_id_seq' );
1718                 $dbw->insert( 'text', array(
1719                         'old_id' => $seqVal,
1720                         'old_flags' => '',
1721                         'old_text' => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n"
1722                 ), $fname );
1723                 $revisionId = $dbw->insertId();
1724
1725                 $dbw->insert( 'revision', array(
1726                         'rev_id' => $seqVal,
1727                         'rev_page' => $newid,
1728                         'rev_comment' => $comment,
1729                         'rev_user' => $wgUser->getID(),
1730                         'rev_user_text' => $wgUser->getName(),
1731                         'rev_timestamp' => $now,
1732                         'inverse_timestamp' => $won,
1733                 ), $fname );
1734
1735                 $dbw->update( 'page',
1736                         /* SET */   array( 'page_latest' => $revisionId ),
1737                         /* WHERE */ array( 'page_id' => $newid ),
1738                         $fname );
1739                 $this->resetArticleID( $newid );
1740
1741                 # Link table
1742                 if ( $dest->getArticleID() ) {
1743                         $dbw->insert( 'links',
1744                                 array(
1745                                         'l_to' => $dest->getArticleID(),
1746                                         'l_from' => $newid
1747                                 ), $fname
1748                         );
1749                 } else {
1750                         $dbw->insert( 'brokenlinks',
1751                                 array(
1752                                         'bl_to' => $dest->getPrefixedDBkey(),
1753                                         'bl_from' => $newid
1754                                 ), $fname
1755                         );
1756                 }
1757
1758                 Article::onArticleCreate( $this );
1759                 return true;
1760         }
1761
1762         /**
1763          * Get categories to which this Title belongs and return an array of
1764          * categories' names.
1765          *
1766          * @return array an array of parents in the form:
1767          *      $parent => $currentarticle
1768          * @access public
1769          */
1770         function getParentCategories() {
1771                 global $wgContLang,$wgUser;
1772
1773                 $titlekey = $this->getArticleId();
1774                 $sk =& $wgUser->getSkin();
1775                 $parents = array();
1776                 $dbr =& wfGetDB( DB_SLAVE );
1777                 $categorylinks = $dbr->tableName( 'categorylinks' );
1778
1779                 # NEW SQL
1780                 $sql = "SELECT * FROM $categorylinks"
1781                      ." WHERE cl_from='$titlekey'"
1782                          ." AND cl_from <> '0'"
1783                          ." ORDER BY cl_sortkey";
1784
1785                 $res = $dbr->query ( $sql ) ;
1786
1787                 if($dbr->numRows($res) > 0) {
1788                         while ( $x = $dbr->fetchObject ( $res ) )
1789                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
1790                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
1791                         $dbr->freeResult ( $res ) ;
1792                 } else {
1793                         $data = '';
1794                 }
1795                 return $data;
1796         }
1797
1798         /**
1799          * Get a tree of parent categories
1800          * @param array $children an array with the children in the keys, to check for circular refs
1801          * @return array
1802          * @access public
1803          */
1804         function getParentCategoryTree( $children = array() ) {
1805                 $parents = $this->getParentCategories();
1806
1807                 if($parents != '') {
1808                         foreach($parents as $parent => $current)
1809                         {
1810                                 if ( array_key_exists( $parent, $children ) ) {
1811                                         # Circular reference
1812                                         $stack[$parent] = array();
1813                                 } else {
1814                                         $nt = Title::newFromText($parent);
1815                                         $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
1816                                 }
1817                         }
1818                         return $stack;
1819                 } else {
1820                         return array();
1821                 }
1822         }
1823
1824
1825         /**
1826          * Get an associative array for selecting this title from
1827          * the "cur" table
1828          *
1829          * @return array
1830          * @access public
1831          */
1832         function curCond() {
1833                 wfDebugDieBacktrace( 'curCond called' );
1834                 return array( 'cur_namespace' => $this->mNamespace, 'cur_title' => $this->mDbkeyform );
1835         }
1836
1837         /**
1838          * Get an associative array for selecting this title from the
1839          * "old" table
1840          *
1841          * @return array
1842          * @access public
1843          */
1844         function oldCond() {
1845                 wfDebugDieBacktrace( 'oldCond called' );
1846                 return array( 'old_namespace' => $this->mNamespace, 'old_title' => $this->mDbkeyform );
1847         }
1848
1849         /**
1850          * Get the revision ID of the previous revision
1851          *
1852          * @param integer $revision  Revision ID. Get the revision that was before this one.
1853          * @return interger $oldrevision|false
1854          */
1855         function getPreviousRevisionID( $revision ) {
1856                 $dbr =& wfGetDB( DB_SLAVE );
1857                 return $dbr->selectField( 'revision', 'rev_id',
1858                         'rev_page=' . IntVal( $this->getArticleId() ) .
1859                         ' AND rev_id<' . IntVal( $revision ) . ' ORDER BY rev_id DESC' );
1860         }
1861
1862         /**
1863          * Get the revision ID of the next revision
1864          *
1865          * @param integer $revision  Revision ID. Get the revision that was after this one.
1866          * @return interger $oldrevision|false
1867          */
1868         function getNextRevisionID( $revision ) {
1869                 $dbr =& wfGetDB( DB_SLAVE );
1870                 return $dbr->selectField( 'revision', 'rev_id',
1871                         'rev_page=' . IntVal( $this->getArticleId() ) .
1872                         ' AND rev_id>' . IntVal( $revision ) . ' ORDER BY rev_id' );
1873         }
1874
1875 }
1876 ?>