includes/Title.php

   1 <?php
   2 /**
   3  * $Id$
   4  * See title.doc
   5  *
   6  * @package MediaWiki
   7  */
   8
   9 /** */
  10 require_once( 'normal/UtfNormal.php' );
  11
  12 /**
  13  *
  14  */
  15 $wgTitleInterwikiCache = array();
  16 define ( 'GAID_FOR_UPDATE', 1 );
  17
  18 /**
  19  * Title class
  20  * - Represents a title, which may contain an interwiki designation or namespace
  21  * - Can fetch various kinds of data from the database, albeit inefficiently.
  22  *
  23  * @todo migrate comments to phpdoc format
  24  * @package MediaWiki
  25  */
  26 class Title {
  27         # All member variables should be considered private
  28         # Please use the accessor functions
  29
  30         var $mTextform;           # Text form (spaces not underscores) of the main part
  31         var $mUrlform;            # URL-encoded form of the main part
  32         var $mDbkeyform;          # Main part with underscores
  33         var $mNamespace;          # Namespace index, i.e. one of the NS_xxxx constants
  34         var $mInterwiki;          # Interwiki prefix (or null string)
  35         var $mFragment;           # Title fragment (i.e. the bit after the #)
  36         var $mArticleID;          # Article ID, fetched from the link cache on demand
  37         var $mRestrictions;       # Array of groups allowed to edit this article
  38                               # Only null or "sysop" are supported
  39         var $mRestrictionsLoaded; # Boolean for initialisation on demand
  40         var $mPrefixedText;       # Text form including namespace/interwiki, initialised on demand
  41         var $mDefaultNamespace;   # Namespace index when there is no namespace
  42                               # Zero except in {{transclusion}} tags
  43
  44 #----------------------------------------------------------------------------
  45 #   Construction
  46 #----------------------------------------------------------------------------
  47
  48         /* private */ function Title() {
  49                 $this->mInterwiki = $this->mUrlform =
  50                 $this->mTextform = $this->mDbkeyform = '';
  51                 $this->mArticleID = -1;
  52                 $this->mNamespace = 0;
  53                 $this->mRestrictionsLoaded = false;
  54                 $this->mRestrictions = array();
  55         $this->mDefaultNamespace = 0;
  56         }
  57
  58         # From a prefixed DB key
  59         /* static */ function newFromDBkey( $key ) {
  60                 $t = new Title();
  61                 $t->mDbkeyform = $key;
  62                 if( $t->secureAndSplit() )
  63                         return $t;
  64                 else
  65                         return NULL;
  66         }
  67
  68         # From text, such as what you would find in a link
  69         /* static */ function newFromText( $text, $defaultNamespace = 0 ) {
  70                 $fname = 'Title::newFromText';
  71                 wfProfileIn( $fname );
  72
  73                 if( is_object( $text ) ) {
  74                         wfDebugDieBacktrace( 'Called with object instead of string.' );
  75                 }
  76                 global $wgInputEncoding;
  77                 $text = do_html_entity_decode( $text, ENT_COMPAT, $wgInputEncoding );
  78
  79                 $text = wfMungeToUtf8( $text );
  80
  81
  82                 # What was this for? TS 2004-03-03
  83                 # $text = urldecode( $text );
  84
  85                 $t = new Title();
  86                 $t->mDbkeyform = str_replace( ' ', '_', $text );
  87                 $t->mDefaultNamespace = $defaultNamespace;
  88
  89                 wfProfileOut( $fname );
  90                 if ( !is_object( $t ) ) {
  91                         var_dump( debug_backtrace() );
  92                 }
  93                 if( $t->secureAndSplit() ) {
  94                         return $t;
  95                 } else {
  96                         return NULL;
  97                 }
  98         }
  99
 100         # From a URL-encoded title
 101         /* static */ function newFromURL( $url ) {
 102                 global $wgLang, $wgServer;
 103                 $t = new Title();
 104
 105                 # For compatibility with old buggy URLs. "+" is not valid in titles,
 106                 # but some URLs used it as a space replacement and they still come
 107                 # from some external search tools.
 108                 $s = str_replace( '+', ' ', $url );
 109
 110                 $t->mDbkeyform = str_replace( ' ', '_', $s );
 111                 if( $t->secureAndSplit() ) {
 112                         # check that length of title is < cur_title size
 113                         $dbr =& wfGetDB( DB_SLAVE );
 114                         $maxSize = $dbr->textFieldSize( 'cur', 'cur_title' );
 115                         if ( $maxSize != -1 && strlen( $t->mDbkeyform ) > $maxSize ) {
 116                                 return NULL;
 117                         }
 118
 119                         return $t;
 120                 } else {
 121                         return NULL;
 122                 }
 123         }
 124
 125         # From a cur_id
 126         # This is inefficiently implemented, the cur row is requested but not
 127         # used for anything else
 128         /* static */ function newFromID( $id ) {
 129                 $fname = 'Title::newFromID';
 130                 $dbr =& wfGetDB( DB_SLAVE );
 131                 $row = $dbr->getArray( 'cur', array( 'cur_namespace', 'cur_title' ),
 132                         array( 'cur_id' => $id ), $fname );
 133                 if ( $row !== false ) {
 134                         $title = Title::makeTitle( $row->cur_namespace, $row->cur_title );
 135                 } else {
 136                         $title = NULL;
 137                 }
 138                 return $title;
 139         }
 140
 141         # From a namespace index and a DB key.
 142         # It's assumed that $ns and $title are *valid*, for instance when
 143         # they came directly from the database or a special page name.
 144         /* static */ function &makeTitle( $ns, $title ) {
 145                 $t =& new Title();
 146                 $t->mInterwiki = '';
 147                 $t->mFragment = '';
 148                 $t->mNamespace = $ns;
 149                 $t->mDbkeyform = $title;
 150                 $t->mArticleID = ( $ns >= 0 ) ? 0 : -1;
 151                 $t->mUrlform = wfUrlencode( $title );
 152                 $t->mTextform = str_replace( '_', ' ', $title );
 153                 return $t;
 154         }
 155
 156         # From a namespace index and a DB key.
 157         # These will be checked for validity, which is a bit slower
 158         # than makeTitle() but safer for user-provided data.
 159         /* static */ function makeTitleSafe( $ns, $title ) {
 160                 $t = new Title();
 161                 $t->mDbkeyform = Title::makeName( $ns, $title );
 162                 if( $t->secureAndSplit() ) {
 163                         return $t;
 164                 } else {
 165                         return NULL;
 166                 }
 167         }
 168
 169         /* static */ function newMainPage() {
 170                 return Title::newFromText( wfMsg( 'mainpage' ) );
 171         }
 172
 173         # Get the title object for a redirect
 174         # Returns NULL if the text is not a valid redirect
 175         /* static */ function newFromRedirect( $text ) {
 176                 global $wgMwRedir;
 177                 $rt = NULL;
 178                 if ( $wgMwRedir->matchStart( $text ) ) {
 179                         if ( preg_match( '/\\[\\[([^\\]\\|]+)[\\]\\|]/', $text, $m ) ) {
 180                                 # categories are escaped using : for example one can enter:
 181                                 # #REDIRECT [[:Category:Music]]. Need to remove it.
 182                                 if ( substr($m[1],0,1) == ':') {
 183                                         # We don't want to keep the ':'
 184                                         $m[1] = substr( $m[1], 1 );
 185                                 }
 186
 187                                 $rt = Title::newFromText( $m[1] );
 188                         }
 189                 }
 190                 return $rt;
 191         }
 192
 193 #----------------------------------------------------------------------------
 194 #       Static functions
 195 #----------------------------------------------------------------------------
 196
 197         # Get the prefixed DB key associated with an ID
 198         /* static */ function nameOf( $id ) {
 199                 $fname = 'Title::nameOf';
 200                 $dbr =& wfGetDB( DB_SLAVE );
 201
 202                 $s = $dbr->getArray( 'cur', array( 'cur_namespace','cur_title' ),  array( 'cur_id' => $id ), $fname );
 203                 if ( $s === false ) { return NULL; }
 204
 205                 $n = Title::makeName( $s->cur_namespace, $s->cur_title );
 206                 return $n;
 207         }
 208
 209         # Get a regex character class describing the legal characters in a link
 210         /* static */ function legalChars() {
 211                 # Missing characters:
 212                 #  * []|# Needed for link syntax
 213                 #  * % and + are corrupted by Apache when they appear in the path
 214                 #
 215                 # % seems to work though
 216                 #
 217                 # The problem with % is that URLs are double-unescaped: once by Apache's
 218                 # path conversion code, and again by PHP. So %253F, for example, becomes "?".
 219                 # Our code does not double-escape to compensate for this, indeed double escaping
 220                 # would break if the double-escaped title was passed in the query string
 221                 # rather than the path. This is a minor security issue because articles can be
 222                 # created such that they are hard to view or edit. -- TS
 223                 #
 224                 # Theoretically 0x80-0x9F of ISO 8859-1 should be disallowed, but
 225                 # this breaks interlanguage links
 226
 227                 $set = " %!\"$&'()*,\\-.\\/0-9:;=?@A-Z\\\\^_`a-z{}~\\x80-\\xFF";
 228                 return $set;
 229         }
 230
 231         # Returns a stripped-down a title string ready for the search index
 232         # Takes a namespace index and a text-form main part
 233         /* static */ function indexTitle( $ns, $title ) {
 234                 global $wgDBminWordLen, $wgLang;
 235                 require_once( 'SearchEngine.php' );
 236
 237                 $lc = SearchEngine::legalSearchChars() . '&#;';
 238                 $t = $wgLang->stripForSearch( $title );
 239                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 240                 $t = strtolower( $t );
 241
 242                 # Handle 's, s'
 243                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 244                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 245
 246                 $t = preg_replace( "/\\s+/", ' ', $t );
 247
 248                 if ( $ns == Namespace::getImage() ) {
 249                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 250                 }
 251                 return trim( $t );
 252         }
 253
 254         # Make a prefixed DB key from a DB key and a namespace index
 255         /* static */ function makeName( $ns, $title ) {
 256                 global $wgLang;
 257
 258                 $n = $wgLang->getNsText( $ns );
 259                 if ( '' == $n ) { return $title; }
 260                 else { return $n.':'.$title; }
 261         }
 262
 263         # Arguably static
 264         # Returns the URL associated with an interwiki prefix
 265         # The URL contains $1, which is replaced by the title
 266         function getInterwikiLink( $key ) {
 267                 global $wgMemc, $wgDBname, $wgInterwikiExpiry, $wgTitleInterwikiCache;
 268                 $fname = 'Title::getInterwikiLink';
 269                 $k = $wgDBname.':interwiki:'.$key;
 270
 271                 if( array_key_exists( $k, $wgTitleInterwikiCache ) )
 272                         return $wgTitleInterwikiCache[$k]->iw_url;
 273
 274                 $s = $wgMemc->get( $k );
 275                 # Ignore old keys with no iw_local
 276                 if( $s && isset( $s->iw_local ) ) {
 277                         $wgTitleInterwikiCache[$k] = $s;
 278                         return $s->iw_url;
 279                 }
 280                 $dbr =& wfGetDB( DB_SLAVE );
 281                 $res = $dbr->select( 'interwiki', array( 'iw_url', 'iw_local' ), array( 'iw_prefix' => $key ), $fname );
 282                 if(!$res) return '';
 283
 284                 $s = $dbr->fetchObject( $res );
 285                 if(!$s) {
 286                         # Cache non-existence: create a blank object and save it to memcached
 287                         $s = (object)false;
 288                         $s->iw_url = '';
 289                         $s->iw_local = 0;
 290                 }
 291                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 292                 $wgTitleInterwikiCache[$k] = $s;
 293                 return $s->iw_url;
 294         }
 295
 296         function isLocal() {
 297                 global $wgTitleInterwikiCache, $wgDBname;
 298
 299                 if ( $this->mInterwiki != '' ) {
 300                         # Make sure key is loaded into cache
 301                         $this->getInterwikiLink( $this->mInterwiki );
 302                         $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 303                         return (bool)($wgTitleInterwikiCache[$k]->iw_local);
 304                 } else {
 305                         return true;
 306                 }
 307         }
 308
 309         # Update the cur_touched field for an array of title objects
 310         # Inefficient unless the IDs are already loaded into the link cache
 311         /* static */ function touchArray( $titles, $timestamp = '' ) {
 312                 if ( count( $titles ) == 0 ) {
 313                         return;
 314                 }
 315                 $dbw =& wfGetDB( DB_MASTER );
 316                 if ( $timestamp == '' ) {
 317                         $timestamp = $dbw->timestamp();
 318                 }
 319                 $cur = $dbw->tableName( 'cur' );
 320                 $sql = "UPDATE $cur SET cur_touched='{$timestamp}' WHERE cur_id IN (";
 321                 $first = true;
 322
 323                 foreach ( $titles as $title ) {
 324                         if ( ! $first ) {
 325                                 $sql .= ',';
 326                         }
 327                         $first = false;
 328                         $sql .= $title->getArticleID();
 329                 }
 330                 $sql .= ')';
 331                 if ( ! $first ) {
 332                         $dbw->query( $sql, 'Title::touchArray' );
 333                 }
 334         }
 335
 336 #----------------------------------------------------------------------------
 337 #       Other stuff
 338 #----------------------------------------------------------------------------
 339
 340         # Simple accessors
 341         # See the definitions at the top of this file
 342
 343         function getText() { return $this->mTextform; }
 344         function getPartialURL() { return $this->mUrlform; }
 345         function getDBkey() { return $this->mDbkeyform; }
 346         function getNamespace() { return $this->mNamespace; }
 347         function setNamespace( $n ) { $this->mNamespace = $n; }
 348         function getInterwiki() { return $this->mInterwiki; }
 349         function getFragment() { return $this->mFragment; }
 350         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 351
 352         # Get title for search index
 353         function getIndexTitle() {
 354                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 355         }
 356
 357         # Get prefixed title with underscores
 358         function getPrefixedDBkey() {
 359                 $s = $this->prefix( $this->mDbkeyform );
 360                 $s = str_replace( ' ', '_', $s );
 361                 return $s;
 362         }
 363
 364         # Get prefixed title with spaces
 365         # This is the form usually used for display
 366         function getPrefixedText() {
 367                 if ( empty( $this->mPrefixedText ) ) {
 368                         $s = $this->prefix( $this->mTextform );
 369                         $s = str_replace( '_', ' ', $s );
 370                         $this->mPrefixedText = $s;
 371                 }
 372                 return $this->mPrefixedText;
 373         }
 374
 375         # As getPrefixedText(), plus fragment.
 376         function getFullText() {
 377                 $text = $this->getPrefixedText();
 378                 if( '' != $this->mFragment ) {
 379                         $text .= '#' . $this->mFragment;
 380                 }
 381                 return $text;
 382         }
 383
 384         # Get a URL-encoded title (not an actual URL) including interwiki
 385         function getPrefixedURL() {
 386                 $s = $this->prefix( $this->mDbkeyform );
 387                 $s = str_replace( ' ', '_', $s );
 388
 389                 $s = wfUrlencode ( $s ) ;
 390
 391                 # Cleaning up URL to make it look nice -- is this safe?
 392                 $s = preg_replace( '/%3[Aa]/', ':', $s );
 393                 $s = preg_replace( '/%2[Ff]/', '/', $s );
 394                 $s = str_replace( '%28', '(', $s );
 395                 $s = str_replace( '%29', ')', $s );
 396
 397                 return $s;
 398         }
 399
 400         # Get a real URL referring to this title, with interwiki link and fragment
 401         function getFullURL( $query = '' ) {
 402                 global $wgLang, $wgArticlePath, $wgServer, $wgScript;
 403
 404                 if ( '' == $this->mInterwiki ) {
 405                         $p = $wgArticlePath;
 406                         return $wgServer . $this->getLocalUrl( $query );
 407                 } else {
 408                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 409                         $namespace = $wgLang->getNsText( $this->mNamespace );
 410                         if ( '' != $namespace ) {
 411                                 # Can this actually happen? Interwikis shouldn't be parsed.
 412                                 $namepace .= ':';
 413                         }
 414                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 415                         if ( '' != $this->mFragment ) {
 416                                 $url .= '#' . $this->mFragment;
 417                         }
 418                         return $url;
 419                 }
 420         }
 421
 422         # Get a URL with an optional query string, no fragment
 423         # * If $query=="", it will use $wgArticlePath
 424         # * Returns a full for an interwiki link, loses any query string
 425         # * Optionally adds the server and escapes for HTML
 426         # * Setting $query to "-" makes an old-style URL with nothing in the
 427         #   query except a title
 428
 429         function getURL() {
 430                 die( 'Call to obsolete obsolete function Title::getURL()' );
 431         }
 432
 433         function getLocalURL( $query = '' ) {
 434                 global $wgLang, $wgArticlePath, $wgScript;
 435
 436                 if ( $this->isExternal() ) {
 437                         return $this->getFullURL();
 438                 }
 439
 440                 $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 441                 if ( $query == '' ) {
 442                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 443                 } else {
 444                         if ( $query == '-' ) {
 445                                 $query = '';
 446                         }
 447                         if ( $wgScript != '' ) {
 448                                 $url = "{$wgScript}?title={$dbkey}&{$query}";
 449                         } else {
 450                                 # Top level wiki
 451                                 $url = "/{$dbkey}?{$query}";
 452                         }
 453                 }
 454                 return $url;
 455         }
 456
 457         function escapeLocalURL( $query = '' ) {
 458                 return htmlspecialchars( $this->getLocalURL( $query ) );
 459         }
 460
 461         function escapeFullURL( $query = '' ) {
 462                 return htmlspecialchars( $this->getFullURL( $query ) );
 463         }
 464
 465         function getInternalURL( $query = '' ) {
 466                 # Used in various Squid-related code, in case we have a different
 467                 # internal hostname for the server than the exposed one.
 468                 global $wgInternalServer;
 469                 return $wgInternalServer . $this->getLocalURL( $query );
 470         }
 471
 472         # Get the edit URL, or a null string if it is an interwiki link
 473         function getEditURL() {
 474                 global $wgServer, $wgScript;
 475
 476                 if ( '' != $this->mInterwiki ) { return ''; }
 477                 $s = $this->getLocalURL( 'action=edit' );
 478
 479                 return $s;
 480         }
 481
 482         # Get HTML-escaped displayable text
 483         # For the title field in <a> tags
 484         function getEscapedText() {
 485                 return htmlspecialchars( $this->getPrefixedText() );
 486         }
 487
 488         # Is the title interwiki?
 489         function isExternal() { return ( '' != $this->mInterwiki ); }
 490
 491         # Does the title correspond to a protected article?
 492         function isProtected() {
 493                 if ( -1 == $this->mNamespace ) { return true; }
 494                 $a = $this->getRestrictions();
 495                 if ( in_array( 'sysop', $a ) ) { return true; }
 496                 return false;
 497         }
 498
 499         # Is the page a log page, i.e. one where the history is messed up by
 500         # LogPage.php? This used to be used for suppressing diff links in recent
 501         # changes, but now that's done by setting a flag in the recentchanges
 502         # table. Hence, this probably is no longer used.
 503         function isLog() {
 504                 if ( $this->mNamespace != Namespace::getWikipedia() ) {
 505                         return false;
 506                 }
 507                 if ( ( 0 == strcmp( wfMsg( 'uploadlogpage' ), $this->mDbkeyform ) ) ||
 508                   ( 0 == strcmp( wfMsg( 'dellogpage' ), $this->mDbkeyform ) ) ) {
 509                         return true;
 510                 }
 511                 return false;
 512         }
 513
 514         # Is $wgUser is watching this page?
 515         function userIsWatching() {
 516                 global $wgUser;
 517
 518                 if ( -1 == $this->mNamespace ) { return false; }
 519                 if ( 0 == $wgUser->getID() ) { return false; }
 520
 521                 return $wgUser->isWatched( $this );
 522         }
 523
 524         # Can $wgUser edit this page?
 525         function userCanEdit() {
 526                 global $wgUser;
 527                 if ( -1 == $this->mNamespace ) { return false; }
 528                 if ( NS_MEDIAWIKI == $this->mNamespace && !$wgUser->isSysop() ) { return false; }
 529                 # if ( 0 == $this->getArticleID() ) { return false; }
 530                 if ( $this->mDbkeyform == '_' ) { return false; }
 531                 # protect global styles and js
 532                 if ( NS_MEDIAWIKI == $this->mNamespace
 533                      && preg_match("/\\.(css|js)$/", $this->mTextform )
 534                      && !$wgUser->isSysop() )
 535                 { return false; }
 536                 //if ( $this->isCssJsSubpage() and !$this->userCanEditCssJsSubpage() ) { return false; }
 537                 # protect css/js subpages of user pages
 538                 # XXX: this might be better using restrictions
 539                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
 540                 if( Namespace::getUser() == $this->mNamespace
 541                         and preg_match("/\\.(css|js)$/", $this->mTextform )
 542                         and !$wgUser->isSysop()
 543                         and !preg_match('/^'.preg_quote($wgUser->getName(), '/').'/', $this->mTextform) )
 544                 { return false; }
 545                 $ur = $wgUser->getRights();
 546                 foreach ( $this->getRestrictions() as $r ) {
 547                         if ( '' != $r && ( ! in_array( $r, $ur ) ) ) {
 548                                 return false;
 549                         }
 550                 }
 551                 return true;
 552         }
 553
 554         function userCanRead() {
 555                 global $wgUser;
 556                 global $wgWhitelistRead;
 557
 558                 if( 0 != $wgUser->getID() ) return true;
 559                 if( !is_array( $wgWhitelistRead ) ) return true;
 560
 561                 $name = $this->getPrefixedText();
 562                 if( in_array( $name, $wgWhitelistRead ) ) return true;
 563
 564                 # Compatibility with old settings
 565                 if( $this->getNamespace() == NS_MAIN ) {
 566                         if( in_array( ':' . $name, $wgWhitelistRead ) ) return true;
 567                 }
 568                 return false;
 569         }
 570
 571         function isCssJsSubpage() {
 572                 return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
 573         }
 574         function isCssSubpage() {
 575                 return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
 576         }
 577         function isJsSubpage() {
 578                 return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
 579         }
 580         function userCanEditCssJsSubpage() {
 581                 # protect css/js subpages of user pages
 582                 # XXX: this might be better using restrictions
 583                 global $wgUser;
 584                 return ( $wgUser->isSysop() or preg_match('/^'.preg_quote($wgUser->getName()).'/', $this->mTextform) );
 585         }
 586
 587         # Accessor/initialisation for mRestrictions
 588         function getRestrictions() {
 589                 $id = $this->getArticleID();
 590                 if ( 0 == $id ) { return array(); }
 591
 592                 if ( ! $this->mRestrictionsLoaded ) {
 593                         $dbr =& wfGetDB( DB_SLAVE );
 594                         $res = $dbr->getField( 'cur', 'cur_restrictions', 'cur_id='.$id );
 595                         $this->mRestrictions = explode( ',', trim( $res ) );
 596                         $this->mRestrictionsLoaded = true;
 597                 }
 598                 return $this->mRestrictions;
 599         }
 600
 601         # Is there a version of this page in the deletion archive?
 602         # Returns the number of archived revisions
 603         function isDeleted() {
 604                 $fname = 'Title::isDeleted';
 605                 $dbr =& wfGetDB( DB_SLAVE );
 606                 $n = $dbr->getField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
 607                         'ar_title' => $this->getDBkey() ), $fname );
 608                 return (int)$n;
 609         }
 610
 611         # Get the article ID from the link cache
 612         # $flags is a bit field, may be GAID_FOR_UPDATE to select for update
 613         function getArticleID( $flags = 0 ) {
 614                 global $wgLinkCache;
 615
 616                 if ( $flags & GAID_FOR_UPDATE ) {
 617                         $oldUpdate = $wgLinkCache->forUpdate( true );
 618                         $this->mArticleID = $wgLinkCache->addLinkObj( $this );
 619                         $wgLinkCache->forUpdate( $oldUpdate );
 620                 } else {
 621                         if ( -1 == $this->mArticleID ) {
 622                                 $this->mArticleID = $wgLinkCache->addLinkObj( $this );
 623                         }
 624                 }
 625                 return $this->mArticleID;
 626         }
 627
 628         # This clears some fields in this object, and clears any associated keys in the
 629         # "bad links" section of $wgLinkCache. This is called from Article::insertNewArticle()
 630         # to allow loading of the new cur_id. It's also called from Article::doDeleteArticle()
 631         function resetArticleID( $newid ) {
 632                 global $wgLinkCache;
 633                 $wgLinkCache->clearBadLink( $this->getPrefixedDBkey() );
 634
 635                 if ( 0 == $newid ) { $this->mArticleID = -1; }
 636                 else { $this->mArticleID = $newid; }
 637                 $this->mRestrictionsLoaded = false;
 638                 $this->mRestrictions = array();
 639         }
 640
 641         # Updates cur_touched
 642         # Called from LinksUpdate.php
 643         function invalidateCache() {
 644                 $now = wfTimestampNow();
 645                 $dbw =& wfGetDB( DB_MASTER );
 646                 $success = $dbw->updateArray( 'cur',
 647                         array( /* SET */
 648                                 'cur_touched' => $dbw->timestamp()
 649                         ), array( /* WHERE */
 650                                 'cur_namespace' => $this->getNamespace() ,
 651                                 'cur_title' => $this->getDBkey()
 652                         ), 'Title::invalidateCache'
 653                 );
 654                 return $success;
 655         }
 656
 657         # Prefixes some arbitrary text with the namespace or interwiki prefix of this object
 658         /* private */ function prefix( $name ) {
 659                 global $wgLang;
 660
 661                 $p = '';
 662                 if ( '' != $this->mInterwiki ) {
 663                         $p = $this->mInterwiki . ':';
 664                 }
 665                 if ( 0 != $this->mNamespace ) {
 666                         $p .= $wgLang->getNsText( $this->mNamespace ) . ':';
 667                 }
 668                 return $p . $name;
 669         }
 670
 671         # Secure and split - main initialisation function for this object
 672         #
 673         # Assumes that mDbkeyform has been set, and is urldecoded
 674     # and uses underscores, but not otherwise munged.  This function
 675     # removes illegal characters, splits off the interwiki and
 676     # namespace prefixes, sets the other forms, and canonicalizes
 677     # everything.
 678         #
 679         /* private */ function secureAndSplit()
 680         {
 681                 global $wgLang, $wgLocalInterwiki, $wgCapitalLinks;
 682                 $fname = 'Title::secureAndSplit';
 683                 wfProfileIn( $fname );
 684
 685                 static $imgpre = false;
 686                 static $rxTc = false;
 687
 688                 # Initialisation
 689                 if ( $imgpre === false ) {
 690                         $imgpre = ':' . $wgLang->getNsText( Namespace::getImage() ) . ':';
 691                         # % is needed as well
 692                         $rxTc = '/[^' . Title::legalChars() . ']/';
 693                 }
 694
 695                 $this->mInterwiki = $this->mFragment = '';
 696                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
 697
 698                 # Clean up whitespace
 699                 #
 700                 $t = preg_replace( "/[\\s_]+/", '_', $this->mDbkeyform );
 701                 $t = preg_replace( '/^_*(.*?)_*$/', '$1', $t );
 702
 703                 if ( '' == $t ) {
 704                         wfProfileOut( $fname );
 705                         return false;
 706                 }
 707
 708                 global $wgUseLatin1;
 709                 if( !$wgUseLatin1 &&  false !== strpos( $t, UTF8_REPLACEMENT ) ) {
 710                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
 711                         wfProfileOut( $fname );
 712                         return false;
 713                 }
 714
 715                 $this->mDbkeyform = $t;
 716                 $done = false;
 717
 718                 # :Image: namespace
 719                 if ( 0 == strncasecmp( $imgpre, $t, strlen( $imgpre ) ) ) {
 720                         $t = substr( $t, 1 );
 721                 }
 722
 723                 # Initial colon indicating main namespace
 724                 if ( ':' == $t{0} ) {
 725                         $r = substr( $t, 1 );
 726                         $this->mNamespace = NS_MAIN;
 727                 } else {
 728                         # Namespace or interwiki prefix
 729                         if ( preg_match( "/^(.+?)_*:_*(.*)$/", $t, $m ) ) {
 730                                 #$p = strtolower( $m[1] );
 731                                 $p = $m[1];
 732                                 $lowerNs = strtolower( $p );
 733                                 if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
 734                                         # Canonical namespace
 735                                         $t = $m[2];
 736                                         $this->mNamespace = $ns;
 737                                 } elseif ( $ns = $wgLang->getNsIndex( $lowerNs )) {
 738                                         # Ordinary namespace
 739                                         $t = $m[2];
 740                                         $this->mNamespace = $ns;
 741                                 } elseif ( $this->getInterwikiLink( $p ) ) {
 742                                         # Interwiki link
 743                                         $t = $m[2];
 744                                         $this->mInterwiki = $p;
 745
 746                                         if ( !preg_match( "/^([A-Za-z0-9_\\x80-\\xff]+):(.*)$/", $t, $m ) ) {
 747                                                 $done = true;
 748                                         } elseif($this->mInterwiki != $wgLocalInterwiki) {
 749                                                 $done = true;
 750                                         }
 751                                 }
 752                         }
 753                         $r = $t;
 754                 }
 755
 756                 # Redundant interwiki prefix to the local wiki
 757                 if ( 0 == strcmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
 758                         $this->mInterwiki = '';
 759                 }
 760                 # We already know that some pages won't be in the database!
 761                 #
 762                 if ( '' != $this->mInterwiki || -1 == $this->mNamespace ) {
 763                         $this->mArticleID = 0;
 764                 }
 765                 $f = strstr( $r, '#' );
 766                 if ( false !== $f ) {
 767                         $this->mFragment = substr( $f, 1 );
 768                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
 769                 }
 770
 771                 # Reject illegal characters.
 772                 #
 773                 if( preg_match( $rxTc, $r ) ) {
 774                         wfProfileOut( $fname );
 775                         return false;
 776                 }
 777
 778                 # "." and ".." conflict with the directories of those namesa
 779                 if ( strpos( $r, '.' ) !== false &&
 780                      ( $r === '.' || $r === '..' ||
 781                        strpos( $r, './' ) === 0  ||
 782                        strpos( $r, '../' ) === 0 ||
 783                        strpos( $r, '/./' ) !== false ||
 784                        strpos( $r, '/../' ) !== false ) )
 785                 {
 786                         wfProfileOut( $fname );
 787                         return false;
 788                 }
 789
 790                 # Initial capital letter
 791                 if( $wgCapitalLinks && $this->mInterwiki == '') {
 792                         $t = $wgLang->ucfirst( $r );
 793                 } else {
 794                         $t = $r;
 795                 }
 796
 797                 # Fill fields
 798                 $this->mDbkeyform = $t;
 799                 $this->mUrlform = wfUrlencode( $t );
 800
 801                 $this->mTextform = str_replace( '_', ' ', $t );
 802
 803                 wfProfileOut( $fname );
 804                 return true;
 805         }
 806
 807         # Get a title object associated with the talk page of this article
 808         function getTalkPage() {
 809                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
 810         }
 811
 812         # Get a title object associated with the subject page of this talk page
 813         function getSubjectPage() {
 814                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
 815         }
 816
 817         # Get an array of Title objects linking to this title
 818         # Also stores the IDs in the link cache
 819         # $options may be FOR UPDATE
 820         function getLinksTo( $options = '' ) {
 821                 global $wgLinkCache;
 822                 $id = $this->getArticleID();
 823
 824                 if ( $options ) {
 825                         $db =& wfGetDB( DB_MASTER );
 826                 } else {
 827                         $db =& wfGetDB( DB_SLAVE );
 828                 }
 829                 $cur = $db->tableName( 'cur' );
 830                 $links = $db->tableName( 'links' );
 831
 832                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM $cur,$links WHERE l_from=cur_id AND l_to={$id} $options";
 833                 $res = $db->query( $sql, 'Title::getLinksTo' );
 834                 $retVal = array();
 835                 if ( $db->numRows( $res ) ) {
 836                         while ( $row = $db->fetchObject( $res ) ) {
 837                                 if ( $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title ) ) {
 838                                         $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
 839                                         $retVal[] = $titleObj;
 840                                 }
 841                         }
 842                 }
 843                 $db->freeResult( $res );
 844                 return $retVal;
 845         }
 846
 847         # Get an array of Title objects linking to this non-existent title
 848         # Also stores the IDs in the link cache
 849         function getBrokenLinksTo( $options = '' ) {
 850                 global $wgLinkCache;
 851
 852                 if ( $options ) {
 853                         $db =& wfGetDB( DB_MASTER );
 854                 } else {
 855                         $db =& wfGetDB( DB_SLAVE );
 856                 }
 857                 $cur = $db->tableName( 'cur' );
 858                 $brokenlinks = $db->tableName( 'brokenlinks' );
 859                 $encTitle = $db->strencode( $this->getPrefixedDBkey() );
 860
 861                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM $brokenlinks,$cur " .
 862                   "WHERE bl_from=cur_id AND bl_to='$encTitle' $options";
 863                 $res = $db->query( $sql, "Title::getBrokenLinksTo" );
 864                 $retVal = array();
 865                 if ( $db->numRows( $res ) ) {
 866                         while ( $row = $db->fetchObject( $res ) ) {
 867                                 $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title );
 868                                 $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
 869                                 $retVal[] = $titleObj;
 870                         }
 871                 }
 872                 $db->freeResult( $res );
 873                 return $retVal;
 874         }
 875
 876         function getSquidURLs() {
 877                 return array(
 878                         $this->getInternalURL(),
 879                         $this->getInternalURL( 'action=history' )
 880                 );
 881         }
 882
 883         function moveNoAuth( &$nt ) {
 884                 return $this->moveTo( $nt, false );
 885         }
 886
 887         # Move a title to a new location
 888         # Returns true on success, message name on failure
 889         # auth indicates whether wgUser's permissions should be checked
 890         function moveTo( &$nt, $auth = true ) {
 891                 if( !$this or !$nt ) {
 892                         return 'badtitletext';
 893                 }
 894
 895                 $fname = 'Title::move';
 896                 $oldid = $this->getArticleID();
 897                 $newid = $nt->getArticleID();
 898
 899                 if ( strlen( $nt->getDBkey() ) < 1 ) {
 900                         return 'articleexists';
 901                 }
 902                 if ( ( ! Namespace::isMovable( $this->getNamespace() ) ) ||
 903                          ( '' == $this->getDBkey() ) ||
 904                          ( '' != $this->getInterwiki() ) ||
 905                          ( !$oldid ) ||
 906                      ( ! Namespace::isMovable( $nt->getNamespace() ) ) ||
 907                          ( '' == $nt->getDBkey() ) ||
 908                          ( '' != $nt->getInterwiki() ) ) {
 909                         return 'badarticleerror';
 910                 }
 911
 912                 if ( $auth && ( !$this->userCanEdit() || !$nt->userCanEdit() ) ) {
 913                         return 'protectedpage';
 914                 }
 915
 916                 # The move is allowed only if (1) the target doesn't exist, or
 917                 # (2) the target is a redirect to the source, and has no history
 918                 # (so we can undo bad moves right after they're done).
 919
 920                 if ( 0 != $newid ) { # Target exists; check for validity
 921                         if ( ! $this->isValidMoveTarget( $nt ) ) {
 922                                 return 'articleexists';
 923                         }
 924                         $this->moveOverExistingRedirect( $nt );
 925                 } else { # Target didn't exist, do normal move.
 926                         $this->moveToNewTitle( $nt, $newid );
 927                 }
 928
 929                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
 930
 931                 $dbw =& wfGetDB( DB_MASTER );
 932                 $sql = "UPDATE categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
 933                         " WHERE cl_from=" . $dbw->addQuotes( $this->getArticleID() ) .
 934                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
 935                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
 936
 937                 # Update watchlists
 938
 939                 $oldnamespace = $this->getNamespace() & ~1;
 940                 $newnamespace = $nt->getNamespace() & ~1;
 941                 $oldtitle = $this->getDBkey();
 942                 $newtitle = $nt->getDBkey();
 943
 944                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
 945                         WatchedItem::duplicateEntries( $this, $nt );
 946                 }
 947
 948                 # Update search engine
 949                 $u = new SearchUpdate( $oldid, $nt->getPrefixedDBkey() );
 950                 $u->doUpdate();
 951                 $u = new SearchUpdate( $newid, $this->getPrefixedDBkey(), '' );
 952                 $u->doUpdate();
 953
 954                 return true;
 955         }
 956
 957         # Move page to title which is presently a redirect to the source page
 958
 959         /* private */ function moveOverExistingRedirect( &$nt ) {
 960                 global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
 961                 $fname = 'Title::moveOverExistingRedirect';
 962                 $comment = wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
 963
 964         $now = wfTimestampNow();
 965         $won = wfInvertTimestamp( $now );
 966                 $newid = $nt->getArticleID();
 967                 $oldid = $this->getArticleID();
 968                 $dbw =& wfGetDB( DB_MASTER );
 969                 $links = $dbw->tableName( 'links' );
 970
 971                 # Change the name of the target page:
 972                 $dbw->updateArray( 'cur',
 973                         /* SET */ array(
 974                                 'cur_touched' => $dbw->timestamp($now),
 975                                 'cur_namespace' => $nt->getNamespace(),
 976                                 'cur_title' => $nt->getDBkey()
 977                         ),
 978                         /* WHERE */ array( 'cur_id' => $oldid ),
 979                         $fname
 980                 );
 981                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
 982
 983                 # Repurpose the old redirect. We don't save it to history since
 984                 # by definition if we've got here it's rather uninteresting.
 985
 986                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
 987                 $dbw->updateArray( 'cur',
 988                         /* SET */ array(
 989                                 'cur_touched' => $dbw->timestamp($now),
 990                                 'cur_timestamp' => $dbw->timestamp($now),
 991                                 'inverse_timestamp' => $won,
 992                                 'cur_namespace' => $this->getNamespace(),
 993                                 'cur_title' => $this->getDBkey(),
 994                                 'cur_text' => $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n",
 995                                 'cur_comment' => $comment,
 996                                 'cur_user' => $wgUser->getID(),
 997                                 'cur_minor_edit' => 0,
 998                                 'cur_counter' => 0,
 999                                 'cur_restrictions' => '',
1000                                 'cur_user_text' => $wgUser->getName(),
1001                                 'cur_is_redirect' => 1,
1002                                 'cur_is_new' => 1
1003                         ),
1004                         /* WHERE */ array( 'cur_id' => $newid ),
1005                         $fname
1006                 );
1007
1008                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1009
1010                 # Fix the redundant names for the past revisions of the target page.
1011                 # The redirect should have no old revisions.
1012                 $dbw->updateArray(
1013                         /* table */ 'old',
1014                         /* SET */ array(
1015                                 'old_namespace' => $nt->getNamespace(),
1016                                 'old_title' => $nt->getDBkey(),
1017                         ),
1018                         /* WHERE */ array(
1019                                 'old_namespace' => $this->getNamespace(),
1020                                 'old_title' => $this->getDBkey(),
1021                         ),
1022                         $fname
1023                 );
1024
1025                 RecentChange::notifyMoveOverRedirect( $now, $this, $nt, $wgUser, $comment );
1026
1027                 # Swap links
1028
1029                 # Load titles and IDs
1030                 $linksToOld = $this->getLinksTo( 'FOR UPDATE' );
1031                 $linksToNew = $nt->getLinksTo( 'FOR UPDATE' );
1032
1033                 # Delete them all
1034                 $sql = "DELETE FROM $links WHERE l_to=$oldid OR l_to=$newid";
1035                 $dbw->query( $sql, $fname );
1036
1037                 # Reinsert
1038                 if ( count( $linksToOld ) || count( $linksToNew )) {
1039                         $sql = "INSERT INTO $links (l_from,l_to) VALUES ";
1040                         $first = true;
1041
1042                         # Insert links to old title
1043                         foreach ( $linksToOld as $linkTitle ) {
1044                                 if ( $first ) {
1045                                         $first = false;
1046                                 } else {
1047                                         $sql .= ',';
1048                                 }
1049                                 $id = $linkTitle->getArticleID();
1050                                 $sql .= "($id,$newid)";
1051                         }
1052
1053                         # Insert links to new title
1054                         foreach ( $linksToNew as $linkTitle ) {
1055                                 if ( $first ) {
1056                                         $first = false;
1057                                 } else {
1058                                         $sql .= ',';
1059                                 }
1060                                 $id = $linkTitle->getArticleID();
1061                                 $sql .= "($id, $oldid)";
1062                         }
1063
1064                         $dbw->query( $sql, DB_MASTER, $fname );
1065                 }
1066
1067                 # Now, we record the link from the redirect to the new title.
1068                 # It should have no other outgoing links...
1069                 $dbw->delete( 'links', array( 'l_from' => $newid ) );
1070                 $dbw->insertArray( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ) );
1071
1072                 # Clear linkscc
1073                 LinkCache::linksccClearLinksTo( $oldid );
1074                 LinkCache::linksccClearLinksTo( $newid );
1075
1076                 # Purge squid
1077                 if ( $wgUseSquid ) {
1078                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1079                         $u = new SquidUpdate( $urls );
1080                         $u->doUpdate();
1081                 }
1082         }
1083
1084         # Move page to non-existing title.
1085         # Sets $newid to be the new article ID
1086
1087         /* private */ function moveToNewTitle( &$nt, &$newid ) {
1088                 global $wgUser, $wgLinkCache, $wgUseSquid;
1089                 $fname = 'MovePageForm::moveToNewTitle';
1090                 $comment = wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1091
1092                 $newid = $nt->getArticleID();
1093                 $oldid = $this->getArticleID();
1094                 $dbw =& wfGetDB( DB_MASTER );
1095                 $now = $dbw->timestamp();
1096                 $won = wfInvertTimestamp( wfTimestamp(TS_MW,$now) );
1097
1098                 # Rename cur entry
1099                 $dbw->updateArray( 'cur',
1100                         /* SET */ array(
1101                                 'cur_touched' => $now,
1102                                 'cur_namespace' => $nt->getNamespace(),
1103                                 'cur_title' => $nt->getDBkey()
1104                         ),
1105                         /* WHERE */ array( 'cur_id' => $oldid ),
1106                         $fname
1107                 );
1108
1109                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1110
1111                 # Insert redirect
1112                 $dbw->insertArray( 'cur', array(
1113                         'cur_id' => $dbw->nextSequenceValue('cur_cur_id_seq'),
1114                         'cur_namespace' => $this->getNamespace(),
1115                         'cur_title' => $this->getDBkey(),
1116                         'cur_comment' => $comment,
1117                         'cur_user' => $wgUser->getID(),
1118                         'cur_user_text' => $wgUser->getName(),
1119                         'cur_timestamp' => $now,
1120                         'inverse_timestamp' => $won,
1121                         'cur_touched' => $now,
1122                         'cur_is_redirect' => 1,
1123                         'cur_is_new' => 1,
1124                         'cur_text' => "#REDIRECT [[" . $nt->getPrefixedText() . "]]\n" ), $fname
1125                 );
1126                 $newid = $dbw->insertId();
1127                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1128
1129                 # Rename old entries
1130                 $dbw->updateArray(
1131                         /* table */ 'old',
1132                         /* SET */ array(
1133                                 'old_namespace' => $nt->getNamespace(),
1134                                 'old_title' => $nt->getDBkey()
1135                         ),
1136                         /* WHERE */ array(
1137                                 'old_namespace' => $this->getNamespace(),
1138                                 'old_title' => $this->getDBkey()
1139                         ), $fname
1140                 );
1141
1142                 # Record in RC
1143                 RecentChange::notifyMoveToNew( $now, $this, $nt, $wgUser, $comment );
1144
1145                 # Purge squid and linkscc as per article creation
1146                 Article::onArticleCreate( $nt );
1147
1148                 # Any text links to the old title must be reassigned to the redirect
1149                 $dbw->updateArray( 'links', array( 'l_to' => $newid ), array( 'l_to' => $oldid ), $fname );
1150                 LinkCache::linksccClearLinksTo( $oldid );
1151
1152                 # Record the just-created redirect's linking to the page
1153                 $dbw->insertArray( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ), $fname );
1154
1155                 # Non-existent target may have had broken links to it; these must
1156                 # now be removed and made into good links.
1157                 $update = new LinksUpdate( $oldid, $nt->getPrefixedDBkey() );
1158                 $update->fixBrokenLinks();
1159
1160                 # Purge old title from squid
1161                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1162                 $titles = $nt->getLinksTo();
1163                 if ( $wgUseSquid ) {
1164                         $urls = $this->getSquidURLs();
1165                         foreach ( $titles as $linkTitle ) {
1166                                 $urls[] = $linkTitle->getInternalURL();
1167                         }
1168                         $u = new SquidUpdate( $urls );
1169                         $u->doUpdate();
1170                 }
1171         }
1172
1173         # Checks if $this can be moved to $nt
1174         # Selects for update, so don't call it unless you mean business
1175         function isValidMoveTarget( $nt ) {
1176                 $fname = 'Title::isValidMoveTarget';
1177                 $dbw =& wfGetDB( DB_MASTER );
1178
1179                 # Is it a redirect?
1180                 $id  = $nt->getArticleID();
1181                 $obj = $dbw->getArray( 'cur', array( 'cur_is_redirect','cur_text' ),
1182                         array( 'cur_id' => $id ), $fname, 'FOR UPDATE' );
1183
1184                 if ( !$obj || 0 == $obj->cur_is_redirect ) {
1185                         # Not a redirect
1186                         return false;
1187                 }
1188
1189                 # Does the redirect point to the source?
1190                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $obj->cur_text, $m ) ) {
1191                         $redirTitle = Title::newFromText( $m[1] );
1192                         if( !is_object( $redirTitle ) ||
1193                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1194                                 return false;
1195                         }
1196                 }
1197
1198                 # Does the article have a history?
1199                 $row = $dbw->getArray( 'old', array( 'old_id' ),
1200                         array(
1201                                 'old_namespace' => $nt->getNamespace(),
1202                                 'old_title' => $nt->getDBkey()
1203                         ), $fname, 'FOR UPDATE'
1204                 );
1205
1206                 # Return true if there was no history
1207                 return $row === false;
1208         }
1209
1210         # Create a redirect, fails if the title already exists, does not notify RC
1211         # Returns success
1212         function createRedirect( $dest, $comment ) {
1213                 global $wgUser;
1214                 if ( $this->getArticleID() ) {
1215                         return false;
1216                 }
1217
1218                 $fname = 'Title::createRedirect';
1219                 $dbw =& wfGetDB( DB_MASTER );
1220                 $now = wfTimestampNow();
1221                 $won = wfInvertTimestamp( $now );
1222                 $seqVal = $dbw->nextSequenceValue( 'cur_cur_id_seq' );
1223
1224                 $dbw->insertArray( 'cur', array(
1225                         'cur_id' => $seqVal,
1226                         'cur_namespace' => $this->getNamespace(),
1227                         'cur_title' => $this->getDBkey(),
1228                         'cur_comment' => $comment,
1229                         'cur_user' => $wgUser->getID(),
1230                         'cur_user_text' => $wgUser->getName(),
1231                         'cur_timestamp' => $now,
1232                         'inverse_timestamp' => $won,
1233                         'cur_touched' => $now,
1234                         'cur_is_redirect' => 1,
1235                         'cur_is_new' => 1,
1236                         'cur_text' => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n"
1237                 ), $fname );
1238                 $newid = $dbw->insertId();
1239                 $this->resetArticleID( $newid );
1240
1241                 # Link table
1242                 if ( $dest->getArticleID() ) {
1243                         $dbw->insertArray( 'links',
1244                                 array(
1245                                         'l_to' => $dest->getArticleID(),
1246                                         'l_from' => $newid
1247                                 ), $fname
1248                         );
1249                 } else {
1250                         $dbw->insertArray( 'brokenlinks',
1251                                 array(
1252                                         'bl_to' => $dest->getPrefixedDBkey(),
1253                                         'bl_from' => $newid
1254                                 ), $fname
1255                         );
1256                 }
1257
1258                 Article::onArticleCreate( $this );
1259                 return true;
1260         }
1261
1262         # Get categories to wich belong this title and return an array of
1263         # categories names.
1264         # Return an array of parents in the form:
1265         #  $parent => $currentarticle
1266         function getParentCategories() {
1267                 global $wgLang,$wgUser;
1268
1269                 $titlekey = $this->getArticleId();
1270                 $sk =& $wgUser->getSkin();
1271                 $parents = array();
1272                 $dbr =& wfGetDB( DB_SLAVE );
1273                 $cur = $dbr->tableName( 'cur' );
1274                 $categorylinks = $dbr->tableName( 'categorylinks' );
1275
1276                 # NEW SQL
1277                 $sql = "SELECT * FROM categorylinks"
1278                      ." WHERE cl_from='$titlekey'"
1279                          ." AND cl_from <> '0'"
1280                          ." ORDER BY cl_sortkey";
1281
1282                 $res = $dbr->query ( $sql ) ;
1283
1284                 if($dbr->numRows($res) > 0) {
1285                         while ( $x = $dbr->fetchObject ( $res ) )
1286                                 //$data[] = Title::newFromText($wgLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
1287                                 $data[$wgLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
1288                         $dbr->freeResult ( $res ) ;
1289                 } else {
1290                         $data = '';
1291                 }
1292                 return $data;
1293         }
1294
1295         # Go through all parents
1296         function getCategorieBrowser() {
1297                 $parents = $this->getParentCategories();
1298
1299                 if($parents != '') {
1300                         foreach($parents as $parent => $current)
1301                         {
1302                                 $nt = Title::newFromText($parent);
1303                                 $stack[$parent] = $nt->getCategorieBrowser();
1304                         }
1305                         return $stack;
1306                 } else {
1307                         return array();
1308                 }
1309         }
1310
1311
1312         # Returns an associative array for selecting this title from cur
1313         function curCond() {
1314                 return array( 'cur_namespace' => $this->mNamespace, 'cur_title' => $this->mDbkeyform );
1315         }
1316
1317         function oldCond() {
1318                 return array( 'old_namespace' => $this->mNamespace, 'old_title' => $this->mDbkeyform );
1319         }
1320 }
1321 ?>