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 ) ? -1 : 0;
 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                                 # Disallow redirects to Special:Userlogout
 189                                 if ( $rt->getNamespace() == NS_SPECIAL && preg_match( '/^Userlogout/i', $rt->getText() ) ) {
 190                                         $rt = NULL;
 191                                 }
 192                         }
 193                 }
 194                 return $rt;
 195         }
 196
 197 #----------------------------------------------------------------------------
 198 #       Static functions
 199 #----------------------------------------------------------------------------
 200
 201         # Get the prefixed DB key associated with an ID
 202         /* static */ function nameOf( $id ) {
 203                 $fname = 'Title::nameOf';
 204                 $dbr =& wfGetDB( DB_SLAVE );
 205
 206                 $s = $dbr->getArray( 'cur', array( 'cur_namespace','cur_title' ),  array( 'cur_id' => $id ), $fname );
 207                 if ( $s === false ) { return NULL; }
 208
 209                 $n = Title::makeName( $s->cur_namespace, $s->cur_title );
 210                 return $n;
 211         }
 212
 213         # Get a regex character class describing the legal characters in a link
 214         /* static */ function legalChars() {
 215                 # Missing characters:
 216                 #  * []|# Needed for link syntax
 217                 #  * % and + are corrupted by Apache when they appear in the path
 218                 #
 219                 # % seems to work though
 220                 #
 221                 # The problem with % is that URLs are double-unescaped: once by Apache's
 222                 # path conversion code, and again by PHP. So %253F, for example, becomes "?".
 223                 # Our code does not double-escape to compensate for this, indeed double escaping
 224                 # would break if the double-escaped title was passed in the query string
 225                 # rather than the path. This is a minor security issue because articles can be
 226                 # created such that they are hard to view or edit. -- TS
 227                 #
 228                 # Theoretically 0x80-0x9F of ISO 8859-1 should be disallowed, but
 229                 # this breaks interlanguage links
 230
 231                 $set = " %!\"$&'()*,\\-.\\/0-9:;=?@A-Z\\\\^_`a-z{}~\\x80-\\xFF";
 232                 return $set;
 233         }
 234
 235         # Returns a stripped-down a title string ready for the search index
 236         # Takes a namespace index and a text-form main part
 237         /* static */ function indexTitle( $ns, $title ) {
 238                 global $wgDBminWordLen, $wgLang;
 239                 require_once( 'SearchEngine.php' );
 240
 241                 $lc = SearchEngine::legalSearchChars() . '&#;';
 242                 $t = $wgLang->stripForSearch( $title );
 243                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 244                 $t = strtolower( $t );
 245
 246                 # Handle 's, s'
 247                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 248                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 249
 250                 $t = preg_replace( "/\\s+/", ' ', $t );
 251
 252                 if ( $ns == Namespace::getImage() ) {
 253                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 254                 }
 255                 return trim( $t );
 256         }
 257
 258         # Make a prefixed DB key from a DB key and a namespace index
 259         /* static */ function makeName( $ns, $title ) {
 260                 global $wgLang;
 261
 262                 $n = $wgLang->getNsText( $ns );
 263                 if ( '' == $n ) { return $title; }
 264                 else { return $n.':'.$title; }
 265         }
 266
 267         # Arguably static
 268         # Returns the URL associated with an interwiki prefix
 269         # The URL contains $1, which is replaced by the title
 270         function getInterwikiLink( $key ) {
 271                 global $wgMemc, $wgDBname, $wgInterwikiExpiry, $wgTitleInterwikiCache;
 272                 $fname = 'Title::getInterwikiLink';
 273                 $k = $wgDBname.':interwiki:'.$key;
 274
 275                 if( array_key_exists( $k, $wgTitleInterwikiCache ) )
 276                         return $wgTitleInterwikiCache[$k]->iw_url;
 277
 278                 $s = $wgMemc->get( $k );
 279                 # Ignore old keys with no iw_local
 280                 if( $s && isset( $s->iw_local ) ) {
 281                         $wgTitleInterwikiCache[$k] = $s;
 282                         return $s->iw_url;
 283                 }
 284                 $dbr =& wfGetDB( DB_SLAVE );
 285                 $res = $dbr->select( 'interwiki', array( 'iw_url', 'iw_local' ), array( 'iw_prefix' => $key ), $fname );
 286                 if(!$res) return '';
 287
 288                 $s = $dbr->fetchObject( $res );
 289                 if(!$s) {
 290                         # Cache non-existence: create a blank object and save it to memcached
 291                         $s = (object)false;
 292                         $s->iw_url = '';
 293                         $s->iw_local = 0;
 294                 }
 295                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 296                 $wgTitleInterwikiCache[$k] = $s;
 297                 return $s->iw_url;
 298         }
 299
 300         function isLocal() {
 301                 global $wgTitleInterwikiCache, $wgDBname;
 302
 303                 if ( $this->mInterwiki != '' ) {
 304                         # Make sure key is loaded into cache
 305                         $this->getInterwikiLink( $this->mInterwiki );
 306                         $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 307                         return (bool)($wgTitleInterwikiCache[$k]->iw_local);
 308                 } else {
 309                         return true;
 310                 }
 311         }
 312
 313         # Update the cur_touched field for an array of title objects
 314         # Inefficient unless the IDs are already loaded into the link cache
 315         /* static */ function touchArray( $titles, $timestamp = '' ) {
 316                 if ( count( $titles ) == 0 ) {
 317                         return;
 318                 }
 319                 $dbw =& wfGetDB( DB_MASTER );
 320                 if ( $timestamp == '' ) {
 321                         $timestamp = $dbw->timestamp();
 322                 }
 323                 $cur = $dbw->tableName( 'cur' );
 324                 $sql = "UPDATE $cur SET cur_touched='{$timestamp}' WHERE cur_id IN (";
 325                 $first = true;
 326
 327                 foreach ( $titles as $title ) {
 328                         if ( ! $first ) {
 329                                 $sql .= ',';
 330                         }
 331                         $first = false;
 332                         $sql .= $title->getArticleID();
 333                 }
 334                 $sql .= ')';
 335                 if ( ! $first ) {
 336                         $dbw->query( $sql, 'Title::touchArray' );
 337                 }
 338         }
 339
 340 #----------------------------------------------------------------------------
 341 #       Other stuff
 342 #----------------------------------------------------------------------------
 343
 344         # Simple accessors
 345         # See the definitions at the top of this file
 346
 347         function getText() { return $this->mTextform; }
 348         function getPartialURL() { return $this->mUrlform; }
 349         function getDBkey() { return $this->mDbkeyform; }
 350         function getNamespace() { return $this->mNamespace; }
 351         function setNamespace( $n ) { $this->mNamespace = $n; }
 352         function getInterwiki() { return $this->mInterwiki; }
 353         function getFragment() { return $this->mFragment; }
 354         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 355
 356         # Get title for search index
 357         function getIndexTitle() {
 358                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 359         }
 360
 361         # Get prefixed title with underscores
 362         function getPrefixedDBkey() {
 363                 $s = $this->prefix( $this->mDbkeyform );
 364                 $s = str_replace( ' ', '_', $s );
 365                 return $s;
 366         }
 367
 368         # Get prefixed title with spaces
 369         # This is the form usually used for display
 370         function getPrefixedText() {
 371                 if ( empty( $this->mPrefixedText ) ) {
 372                         $s = $this->prefix( $this->mTextform );
 373                         $s = str_replace( '_', ' ', $s );
 374                         $this->mPrefixedText = $s;
 375                 }
 376                 return $this->mPrefixedText;
 377         }
 378
 379         # As getPrefixedText(), plus fragment.
 380         function getFullText() {
 381                 $text = $this->getPrefixedText();
 382                 if( '' != $this->mFragment ) {
 383                         $text .= '#' . $this->mFragment;
 384                 }
 385                 return $text;
 386         }
 387
 388         # Get a URL-encoded title (not an actual URL) including interwiki
 389         function getPrefixedURL() {
 390                 $s = $this->prefix( $this->mDbkeyform );
 391                 $s = str_replace( ' ', '_', $s );
 392
 393                 $s = wfUrlencode ( $s ) ;
 394
 395                 # Cleaning up URL to make it look nice -- is this safe?
 396                 $s = preg_replace( '/%3[Aa]/', ':', $s );
 397                 $s = preg_replace( '/%2[Ff]/', '/', $s );
 398                 $s = str_replace( '%28', '(', $s );
 399                 $s = str_replace( '%29', ')', $s );
 400
 401                 return $s;
 402         }
 403
 404         # Get a real URL referring to this title, with interwiki link and fragment
 405         function getFullURL( $query = '' ) {
 406                 global $wgLang, $wgArticlePath, $wgServer, $wgScript;
 407
 408                 if ( '' == $this->mInterwiki ) {
 409                         $p = $wgArticlePath;
 410                         return $wgServer . $this->getLocalUrl( $query );
 411                 } else {
 412                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 413                         $namespace = $wgLang->getNsText( $this->mNamespace );
 414                         if ( '' != $namespace ) {
 415                                 # Can this actually happen? Interwikis shouldn't be parsed.
 416                                 $namepace .= ':';
 417                         }
 418                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 419                         if ( '' != $this->mFragment ) {
 420                                 $url .= '#' . $this->mFragment;
 421                         }
 422                         return $url;
 423                 }
 424         }
 425
 426         # Get a URL with an optional query string, no fragment
 427         # * If $query=="", it will use $wgArticlePath
 428         # * Returns a full for an interwiki link, loses any query string
 429         # * Optionally adds the server and escapes for HTML
 430         # * Setting $query to "-" makes an old-style URL with nothing in the
 431         #   query except a title
 432
 433         function getURL() {
 434                 die( 'Call to obsolete obsolete function Title::getURL()' );
 435         }
 436
 437         function getLocalURL( $query = '' ) {
 438                 global $wgLang, $wgArticlePath, $wgScript;
 439
 440                 if ( $this->isExternal() ) {
 441                         return $this->getFullURL();
 442                 }
 443
 444                 $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 445                 if ( $query == '' ) {
 446                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 447                 } else {
 448                         if ( $query == '-' ) {
 449                                 $query = '';
 450                         }
 451                         if ( $wgScript != '' ) {
 452                                 $url = "{$wgScript}?title={$dbkey}&{$query}";
 453                         } else {
 454                                 # Top level wiki
 455                                 $url = "/{$dbkey}?{$query}";
 456                         }
 457                 }
 458                 return $url;
 459         }
 460
 461         function escapeLocalURL( $query = '' ) {
 462                 return htmlspecialchars( $this->getLocalURL( $query ) );
 463         }
 464
 465         function escapeFullURL( $query = '' ) {
 466                 return htmlspecialchars( $this->getFullURL( $query ) );
 467         }
 468
 469         function getInternalURL( $query = '' ) {
 470                 # Used in various Squid-related code, in case we have a different
 471                 # internal hostname for the server than the exposed one.
 472                 global $wgInternalServer;
 473                 return $wgInternalServer . $this->getLocalURL( $query );
 474         }
 475
 476         # Get the edit URL, or a null string if it is an interwiki link
 477         function getEditURL() {
 478                 global $wgServer, $wgScript;
 479
 480                 if ( '' != $this->mInterwiki ) { return ''; }
 481                 $s = $this->getLocalURL( 'action=edit' );
 482
 483                 return $s;
 484         }
 485
 486         # Get HTML-escaped displayable text
 487         # For the title field in <a> tags
 488         function getEscapedText() {
 489                 return htmlspecialchars( $this->getPrefixedText() );
 490         }
 491
 492         # Is the title interwiki?
 493         function isExternal() { return ( '' != $this->mInterwiki ); }
 494
 495         # Does the title correspond to a protected article?
 496         function isProtected() {
 497                 if ( -1 == $this->mNamespace ) { return true; }
 498                 $a = $this->getRestrictions();
 499                 if ( in_array( 'sysop', $a ) ) { return true; }
 500                 return false;
 501         }
 502
 503         # Is the page a log page, i.e. one where the history is messed up by
 504         # LogPage.php? This used to be used for suppressing diff links in recent
 505         # changes, but now that's done by setting a flag in the recentchanges
 506         # table. Hence, this probably is no longer used.
 507         function isLog() {
 508                 if ( $this->mNamespace != Namespace::getWikipedia() ) {
 509                         return false;
 510                 }
 511                 if ( ( 0 == strcmp( wfMsg( 'uploadlogpage' ), $this->mDbkeyform ) ) ||
 512                   ( 0 == strcmp( wfMsg( 'dellogpage' ), $this->mDbkeyform ) ) ) {
 513                         return true;
 514                 }
 515                 return false;
 516         }
 517
 518         # Is $wgUser is watching this page?
 519         function userIsWatching() {
 520                 global $wgUser;
 521
 522                 if ( -1 == $this->mNamespace ) { return false; }
 523                 if ( 0 == $wgUser->getID() ) { return false; }
 524
 525                 return $wgUser->isWatched( $this );
 526         }
 527
 528         # Can $wgUser edit this page?
 529         function userCanEdit() {
 530                 global $wgUser;
 531                 if ( -1 == $this->mNamespace ) { return false; }
 532                 if ( NS_MEDIAWIKI == $this->mNamespace && !$wgUser->isSysop() ) { return false; }
 533                 # if ( 0 == $this->getArticleID() ) { return false; }
 534                 if ( $this->mDbkeyform == '_' ) { return false; }
 535                 # protect global styles and js
 536                 if ( NS_MEDIAWIKI == $this->mNamespace
 537                      && preg_match("/\\.(css|js)$/", $this->mTextform )
 538                      && !$wgUser->isSysop() )
 539                 { return false; }
 540                 //if ( $this->isCssJsSubpage() and !$this->userCanEditCssJsSubpage() ) { return false; }
 541                 # protect css/js subpages of user pages
 542                 # XXX: this might be better using restrictions
 543                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
 544                 if( Namespace::getUser() == $this->mNamespace
 545                         and preg_match("/\\.(css|js)$/", $this->mTextform )
 546                         and !$wgUser->isSysop()
 547                         and !preg_match('/^'.preg_quote($wgUser->getName(), '/').'/', $this->mTextform) )
 548                 { return false; }
 549                 $ur = $wgUser->getRights();
 550                 foreach ( $this->getRestrictions() as $r ) {
 551                         if ( '' != $r && ( ! in_array( $r, $ur ) ) ) {
 552                                 return false;
 553                         }
 554                 }
 555                 return true;
 556         }
 557
 558         function userCanRead() {
 559                 global $wgUser;
 560                 global $wgWhitelistRead;
 561
 562                 if( 0 != $wgUser->getID() ) return true;
 563                 if( !is_array( $wgWhitelistRead ) ) return true;
 564
 565                 $name = $this->getPrefixedText();
 566                 if( in_array( $name, $wgWhitelistRead ) ) return true;
 567
 568                 # Compatibility with old settings
 569                 if( $this->getNamespace() == NS_MAIN ) {
 570                         if( in_array( ':' . $name, $wgWhitelistRead ) ) return true;
 571                 }
 572                 return false;
 573         }
 574
 575         function isCssJsSubpage() {
 576                 return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
 577         }
 578         function isCssSubpage() {
 579                 return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
 580         }
 581         function isJsSubpage() {
 582                 return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
 583         }
 584         function userCanEditCssJsSubpage() {
 585                 # protect css/js subpages of user pages
 586                 # XXX: this might be better using restrictions
 587                 global $wgUser;
 588                 return ( $wgUser->isSysop() or preg_match('/^'.preg_quote($wgUser->getName()).'/', $this->mTextform) );
 589         }
 590
 591         # Accessor/initialisation for mRestrictions
 592         function getRestrictions() {
 593                 $id = $this->getArticleID();
 594                 if ( 0 == $id ) { return array(); }
 595
 596                 if ( ! $this->mRestrictionsLoaded ) {
 597                         $dbr =& wfGetDB( DB_SLAVE );
 598                         $res = $dbr->getField( 'cur', 'cur_restrictions', 'cur_id='.$id );
 599                         $this->mRestrictions = explode( ',', trim( $res ) );
 600                         $this->mRestrictionsLoaded = true;
 601                 }
 602                 return $this->mRestrictions;
 603         }
 604
 605         # Is there a version of this page in the deletion archive?
 606         # Returns the number of archived revisions
 607         function isDeleted() {
 608                 $fname = 'Title::isDeleted';
 609                 $dbr =& wfGetDB( DB_SLAVE );
 610                 $n = $dbr->getField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
 611                         'ar_title' => $this->getDBkey() ), $fname );
 612                 return (int)$n;
 613         }
 614
 615         # Get the article ID from the link cache
 616         # $flags is a bit field, may be GAID_FOR_UPDATE to select for update
 617         function getArticleID( $flags = 0 ) {
 618                 global $wgLinkCache;
 619
 620                 if ( $flags & GAID_FOR_UPDATE ) {
 621                         $oldUpdate = $wgLinkCache->forUpdate( true );
 622                         $this->mArticleID = $wgLinkCache->addLinkObj( $this );
 623                         $wgLinkCache->forUpdate( $oldUpdate );
 624                 } else {
 625                         if ( -1 == $this->mArticleID ) {
 626                                 $this->mArticleID = $wgLinkCache->addLinkObj( $this );
 627                         }
 628                 }
 629                 return $this->mArticleID;
 630         }
 631
 632         # This clears some fields in this object, and clears any associated keys in the
 633         # "bad links" section of $wgLinkCache. This is called from Article::insertNewArticle()
 634         # to allow loading of the new cur_id. It's also called from Article::doDeleteArticle()
 635         function resetArticleID( $newid ) {
 636                 global $wgLinkCache;
 637                 $wgLinkCache->clearBadLink( $this->getPrefixedDBkey() );
 638
 639                 if ( 0 == $newid ) { $this->mArticleID = -1; }
 640                 else { $this->mArticleID = $newid; }
 641                 $this->mRestrictionsLoaded = false;
 642                 $this->mRestrictions = array();
 643         }
 644
 645         # Updates cur_touched
 646         # Called from LinksUpdate.php
 647         function invalidateCache() {
 648                 $now = wfTimestampNow();
 649                 $dbw =& wfGetDB( DB_MASTER );
 650                 $success = $dbw->updateArray( 'cur',
 651                         array( /* SET */
 652                                 'cur_touched' => $dbw->timestamp()
 653                         ), array( /* WHERE */
 654                                 'cur_namespace' => $this->getNamespace() ,
 655                                 'cur_title' => $this->getDBkey()
 656                         ), 'Title::invalidateCache'
 657                 );
 658                 return $success;
 659         }
 660
 661         # Prefixes some arbitrary text with the namespace or interwiki prefix of this object
 662         /* private */ function prefix( $name ) {
 663                 global $wgLang;
 664
 665                 $p = '';
 666                 if ( '' != $this->mInterwiki ) {
 667                         $p = $this->mInterwiki . ':';
 668                 }
 669                 if ( 0 != $this->mNamespace ) {
 670                         $p .= $wgLang->getNsText( $this->mNamespace ) . ':';
 671                 }
 672                 return $p . $name;
 673         }
 674
 675         # Secure and split - main initialisation function for this object
 676         #
 677         # Assumes that mDbkeyform has been set, and is urldecoded
 678     # and uses underscores, but not otherwise munged.  This function
 679     # removes illegal characters, splits off the interwiki and
 680     # namespace prefixes, sets the other forms, and canonicalizes
 681     # everything.
 682         #
 683         /* private */ function secureAndSplit()
 684         {
 685                 global $wgLang, $wgLocalInterwiki, $wgCapitalLinks;
 686                 $fname = 'Title::secureAndSplit';
 687                 wfProfileIn( $fname );
 688
 689                 static $imgpre = false;
 690                 static $rxTc = false;
 691
 692                 # Initialisation
 693                 if ( $imgpre === false ) {
 694                         $imgpre = ':' . $wgLang->getNsText( Namespace::getImage() ) . ':';
 695                         # % is needed as well
 696                         $rxTc = '/[^' . Title::legalChars() . ']/';
 697                 }
 698
 699                 $this->mInterwiki = $this->mFragment = '';
 700                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
 701
 702                 # Clean up whitespace
 703                 #
 704                 $t = preg_replace( "/[\\s_]+/", '_', $this->mDbkeyform );
 705                 $t = preg_replace( '/^_*(.*?)_*$/', '$1', $t );
 706
 707                 if ( '' == $t ) {
 708                         wfProfileOut( $fname );
 709                         return false;
 710                 }
 711
 712                 global $wgUseLatin1;
 713                 if( !$wgUseLatin1 &&  false !== strpos( $t, UTF8_REPLACEMENT ) ) {
 714                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
 715                         wfProfileOut( $fname );
 716                         return false;
 717                 }
 718
 719                 $this->mDbkeyform = $t;
 720                 $done = false;
 721
 722                 # :Image: namespace
 723                 if ( 0 == strncasecmp( $imgpre, $t, strlen( $imgpre ) ) ) {
 724                         $t = substr( $t, 1 );
 725                 }
 726
 727                 # Initial colon indicating main namespace
 728                 if ( ':' == $t{0} ) {
 729                         $r = substr( $t, 1 );
 730                         $this->mNamespace = NS_MAIN;
 731                 } else {
 732                         # Namespace or interwiki prefix
 733                         if ( preg_match( "/^(.+?)_*:_*(.*)$/", $t, $m ) ) {
 734                                 #$p = strtolower( $m[1] );
 735                                 $p = $m[1];
 736                                 $lowerNs = strtolower( $p );
 737                                 if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
 738                                         # Canonical namespace
 739                                         $t = $m[2];
 740                                         $this->mNamespace = $ns;
 741                                 } elseif ( $ns = $wgLang->getNsIndex( $lowerNs )) {
 742                                         # Ordinary namespace
 743                                         $t = $m[2];
 744                                         $this->mNamespace = $ns;
 745                                 } elseif ( $this->getInterwikiLink( $p ) ) {
 746                                         # Interwiki link
 747                                         $t = $m[2];
 748                                         $this->mInterwiki = $p;
 749
 750                                         if ( !preg_match( "/^([A-Za-z0-9_\\x80-\\xff]+):(.*)$/", $t, $m ) ) {
 751                                                 $done = true;
 752                                         } elseif($this->mInterwiki != $wgLocalInterwiki) {
 753                                                 $done = true;
 754                                         }
 755                                 }
 756                         }
 757                         $r = $t;
 758                 }
 759
 760                 # Redundant interwiki prefix to the local wiki
 761                 if ( 0 == strcmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
 762                         $this->mInterwiki = '';
 763                 }
 764                 # We already know that some pages won't be in the database!
 765                 #
 766                 if ( '' != $this->mInterwiki || -1 == $this->mNamespace ) {
 767                         $this->mArticleID = 0;
 768                 }
 769                 $f = strstr( $r, '#' );
 770                 if ( false !== $f ) {
 771                         $this->mFragment = substr( $f, 1 );
 772                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
 773                 }
 774
 775                 # Reject illegal characters.
 776                 #
 777                 if( preg_match( $rxTc, $r ) ) {
 778                         wfProfileOut( $fname );
 779                         return false;
 780                 }
 781
 782                 # "." and ".." conflict with the directories of those namesa
 783                 if ( strpos( $r, '.' ) !== false &&
 784                      ( $r === '.' || $r === '..' ||
 785                        strpos( $r, './' ) === 0  ||
 786                        strpos( $r, '../' ) === 0 ||
 787                        strpos( $r, '/./' ) !== false ||
 788                        strpos( $r, '/../' ) !== false ) )
 789                 {
 790                         wfProfileOut( $fname );
 791                         return false;
 792                 }
 793
 794                 # Initial capital letter
 795                 if( $wgCapitalLinks && $this->mInterwiki == '') {
 796                         $t = $wgLang->ucfirst( $r );
 797                 } else {
 798                         $t = $r;
 799                 }
 800
 801                 # Fill fields
 802                 $this->mDbkeyform = $t;
 803                 $this->mUrlform = wfUrlencode( $t );
 804
 805                 $this->mTextform = str_replace( '_', ' ', $t );
 806
 807                 wfProfileOut( $fname );
 808                 return true;
 809         }
 810
 811         # Get a title object associated with the talk page of this article
 812         function getTalkPage() {
 813                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
 814         }
 815
 816         # Get a title object associated with the subject page of this talk page
 817         function getSubjectPage() {
 818                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
 819         }
 820
 821         # Get an array of Title objects linking to this title
 822         # Also stores the IDs in the link cache
 823         # $options may be FOR UPDATE
 824         function getLinksTo( $options = '' ) {
 825                 global $wgLinkCache;
 826                 $id = $this->getArticleID();
 827
 828                 if ( $options ) {
 829                         $db =& wfGetDB( DB_MASTER );
 830                 } else {
 831                         $db =& wfGetDB( DB_SLAVE );
 832                 }
 833                 $cur = $db->tableName( 'cur' );
 834                 $links = $db->tableName( 'links' );
 835
 836                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM $cur,$links WHERE l_from=cur_id AND l_to={$id} $options";
 837                 $res = $db->query( $sql, 'Title::getLinksTo' );
 838                 $retVal = array();
 839                 if ( $db->numRows( $res ) ) {
 840                         while ( $row = $db->fetchObject( $res ) ) {
 841                                 if ( $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title ) ) {
 842                                         $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
 843                                         $retVal[] = $titleObj;
 844                                 }
 845                         }
 846                 }
 847                 $db->freeResult( $res );
 848                 return $retVal;
 849         }
 850
 851         # Get an array of Title objects linking to this non-existent title
 852         # Also stores the IDs in the link cache
 853         function getBrokenLinksTo( $options = '' ) {
 854                 global $wgLinkCache;
 855
 856                 if ( $options ) {
 857                         $db =& wfGetDB( DB_MASTER );
 858                 } else {
 859                         $db =& wfGetDB( DB_SLAVE );
 860                 }
 861                 $cur = $db->tableName( 'cur' );
 862                 $brokenlinks = $db->tableName( 'brokenlinks' );
 863                 $encTitle = $db->strencode( $this->getPrefixedDBkey() );
 864
 865                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM $brokenlinks,$cur " .
 866                   "WHERE bl_from=cur_id AND bl_to='$encTitle' $options";
 867                 $res = $db->query( $sql, "Title::getBrokenLinksTo" );
 868                 $retVal = array();
 869                 if ( $db->numRows( $res ) ) {
 870                         while ( $row = $db->fetchObject( $res ) ) {
 871                                 $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title );
 872                                 $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
 873                                 $retVal[] = $titleObj;
 874                         }
 875                 }
 876                 $db->freeResult( $res );
 877                 return $retVal;
 878         }
 879
 880         function getSquidURLs() {
 881                 return array(
 882                         $this->getInternalURL(),
 883                         $this->getInternalURL( 'action=history' )
 884                 );
 885         }
 886
 887         function moveNoAuth( &$nt ) {
 888                 return $this->moveTo( $nt, false );
 889         }
 890
 891         # Move a title to a new location
 892         # Returns true on success, message name on failure
 893         # auth indicates whether wgUser's permissions should be checked
 894         function moveTo( &$nt, $auth = true ) {
 895                 if( !$this or !$nt ) {
 896                         return 'badtitletext';
 897                 }
 898
 899                 $fname = 'Title::move';
 900                 $oldid = $this->getArticleID();
 901                 $newid = $nt->getArticleID();
 902
 903                 if ( strlen( $nt->getDBkey() ) < 1 ) {
 904                         return 'articleexists';
 905                 }
 906                 if ( ( ! Namespace::isMovable( $this->getNamespace() ) ) ||
 907                          ( '' == $this->getDBkey() ) ||
 908                          ( '' != $this->getInterwiki() ) ||
 909                          ( !$oldid ) ||
 910                      ( ! Namespace::isMovable( $nt->getNamespace() ) ) ||
 911                          ( '' == $nt->getDBkey() ) ||
 912                          ( '' != $nt->getInterwiki() ) ) {
 913                         return 'badarticleerror';
 914                 }
 915
 916                 if ( $auth && ( !$this->userCanEdit() || !$nt->userCanEdit() ) ) {
 917                         return 'protectedpage';
 918                 }
 919
 920                 # The move is allowed only if (1) the target doesn't exist, or
 921                 # (2) the target is a redirect to the source, and has no history
 922                 # (so we can undo bad moves right after they're done).
 923
 924                 if ( 0 != $newid ) { # Target exists; check for validity
 925                         if ( ! $this->isValidMoveTarget( $nt ) ) {
 926                                 return 'articleexists';
 927                         }
 928                         $this->moveOverExistingRedirect( $nt );
 929                 } else { # Target didn't exist, do normal move.
 930                         $this->moveToNewTitle( $nt, $newid );
 931                 }
 932
 933                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
 934
 935                 $dbw =& wfGetDB( DB_MASTER );
 936                 $sql = "UPDATE categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
 937                         " WHERE cl_from=" . $dbw->addQuotes( $this->getArticleID() ) .
 938                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
 939                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
 940
 941                 # Update watchlists
 942
 943                 $oldnamespace = $this->getNamespace() & ~1;
 944                 $newnamespace = $nt->getNamespace() & ~1;
 945                 $oldtitle = $this->getDBkey();
 946                 $newtitle = $nt->getDBkey();
 947
 948                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
 949                         WatchedItem::duplicateEntries( $this, $nt );
 950                 }
 951
 952                 # Update search engine
 953                 $u = new SearchUpdate( $oldid, $nt->getPrefixedDBkey() );
 954                 $u->doUpdate();
 955                 $u = new SearchUpdate( $newid, $this->getPrefixedDBkey(), '' );
 956                 $u->doUpdate();
 957
 958                 return true;
 959         }
 960
 961         # Move page to title which is presently a redirect to the source page
 962
 963         /* private */ function moveOverExistingRedirect( &$nt ) {
 964                 global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
 965                 $fname = 'Title::moveOverExistingRedirect';
 966                 $comment = wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
 967
 968         $now = wfTimestampNow();
 969         $won = wfInvertTimestamp( $now );
 970                 $newid = $nt->getArticleID();
 971                 $oldid = $this->getArticleID();
 972                 $dbw =& wfGetDB( DB_MASTER );
 973                 $links = $dbw->tableName( 'links' );
 974
 975                 # Change the name of the target page:
 976                 $dbw->updateArray( 'cur',
 977                         /* SET */ array(
 978                                 'cur_touched' => $dbw->timestamp($now),
 979                                 'cur_namespace' => $nt->getNamespace(),
 980                                 'cur_title' => $nt->getDBkey()
 981                         ),
 982                         /* WHERE */ array( 'cur_id' => $oldid ),
 983                         $fname
 984                 );
 985                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
 986
 987                 # Repurpose the old redirect. We don't save it to history since
 988                 # by definition if we've got here it's rather uninteresting.
 989
 990                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
 991                 $dbw->updateArray( 'cur',
 992                         /* SET */ array(
 993                                 'cur_touched' => $dbw->timestamp($now),
 994                                 'cur_timestamp' => $dbw->timestamp($now),
 995                                 'inverse_timestamp' => $won,
 996                                 'cur_namespace' => $this->getNamespace(),
 997                                 'cur_title' => $this->getDBkey(),
 998                                 'cur_text' => $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n",
 999                                 'cur_comment' => $comment,
1000                                 'cur_user' => $wgUser->getID(),
1001                                 'cur_minor_edit' => 0,
1002                                 'cur_counter' => 0,
1003                                 'cur_restrictions' => '',
1004                                 'cur_user_text' => $wgUser->getName(),
1005                                 'cur_is_redirect' => 1,
1006                                 'cur_is_new' => 1
1007                         ),
1008                         /* WHERE */ array( 'cur_id' => $newid ),
1009                         $fname
1010                 );
1011
1012                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1013
1014                 # Fix the redundant names for the past revisions of the target page.
1015                 # The redirect should have no old revisions.
1016                 $dbw->updateArray(
1017                         /* table */ 'old',
1018                         /* SET */ array(
1019                                 'old_namespace' => $nt->getNamespace(),
1020                                 'old_title' => $nt->getDBkey(),
1021                         ),
1022                         /* WHERE */ array(
1023                                 'old_namespace' => $this->getNamespace(),
1024                                 'old_title' => $this->getDBkey(),
1025                         ),
1026                         $fname
1027                 );
1028
1029                 RecentChange::notifyMoveOverRedirect( $now, $this, $nt, $wgUser, $comment );
1030
1031                 # Swap links
1032
1033                 # Load titles and IDs
1034                 $linksToOld = $this->getLinksTo( 'FOR UPDATE' );
1035                 $linksToNew = $nt->getLinksTo( 'FOR UPDATE' );
1036
1037                 # Delete them all
1038                 $sql = "DELETE FROM $links WHERE l_to=$oldid OR l_to=$newid";
1039                 $dbw->query( $sql, $fname );
1040
1041                 # Reinsert
1042                 if ( count( $linksToOld ) || count( $linksToNew )) {
1043                         $sql = "INSERT INTO $links (l_from,l_to) VALUES ";
1044                         $first = true;
1045
1046                         # Insert links to old title
1047                         foreach ( $linksToOld as $linkTitle ) {
1048                                 if ( $first ) {
1049                                         $first = false;
1050                                 } else {
1051                                         $sql .= ',';
1052                                 }
1053                                 $id = $linkTitle->getArticleID();
1054                                 $sql .= "($id,$newid)";
1055                         }
1056
1057                         # Insert links to new title
1058                         foreach ( $linksToNew as $linkTitle ) {
1059                                 if ( $first ) {
1060                                         $first = false;
1061                                 } else {
1062                                         $sql .= ',';
1063                                 }
1064                                 $id = $linkTitle->getArticleID();
1065                                 $sql .= "($id, $oldid)";
1066                         }
1067
1068                         $dbw->query( $sql, DB_MASTER, $fname );
1069                 }
1070
1071                 # Now, we record the link from the redirect to the new title.
1072                 # It should have no other outgoing links...
1073                 $dbw->delete( 'links', array( 'l_from' => $newid ) );
1074                 $dbw->insertArray( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ) );
1075
1076                 # Clear linkscc
1077                 LinkCache::linksccClearLinksTo( $oldid );
1078                 LinkCache::linksccClearLinksTo( $newid );
1079
1080                 # Purge squid
1081                 if ( $wgUseSquid ) {
1082                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1083                         $u = new SquidUpdate( $urls );
1084                         $u->doUpdate();
1085                 }
1086         }
1087
1088         # Move page to non-existing title.
1089         # Sets $newid to be the new article ID
1090
1091         /* private */ function moveToNewTitle( &$nt, &$newid ) {
1092                 global $wgUser, $wgLinkCache, $wgUseSquid;
1093                 $fname = 'MovePageForm::moveToNewTitle';
1094                 $comment = wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1095
1096                 $newid = $nt->getArticleID();
1097                 $oldid = $this->getArticleID();
1098                 $dbw =& wfGetDB( DB_MASTER );
1099                 $now = $dbw->timestamp();
1100                 $won = wfInvertTimestamp( wfTimestamp(TS_MW,$now) );
1101
1102                 # Rename cur entry
1103                 $dbw->updateArray( 'cur',
1104                         /* SET */ array(
1105                                 'cur_touched' => $now,
1106                                 'cur_namespace' => $nt->getNamespace(),
1107                                 'cur_title' => $nt->getDBkey()
1108                         ),
1109                         /* WHERE */ array( 'cur_id' => $oldid ),
1110                         $fname
1111                 );
1112
1113                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1114
1115                 # Insert redirect
1116                 $dbw->insertArray( 'cur', array(
1117                         'cur_id' => $dbw->nextSequenceValue('cur_cur_id_seq'),
1118                         'cur_namespace' => $this->getNamespace(),
1119                         'cur_title' => $this->getDBkey(),
1120                         'cur_comment' => $comment,
1121                         'cur_user' => $wgUser->getID(),
1122                         'cur_user_text' => $wgUser->getName(),
1123                         'cur_timestamp' => $now,
1124                         'inverse_timestamp' => $won,
1125                         'cur_touched' => $now,
1126                         'cur_is_redirect' => 1,
1127                         'cur_is_new' => 1,
1128                         'cur_text' => "#REDIRECT [[" . $nt->getPrefixedText() . "]]\n" ), $fname
1129                 );
1130                 $newid = $dbw->insertId();
1131                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1132
1133                 # Rename old entries
1134                 $dbw->updateArray(
1135                         /* table */ 'old',
1136                         /* SET */ array(
1137                                 'old_namespace' => $nt->getNamespace(),
1138                                 'old_title' => $nt->getDBkey()
1139                         ),
1140                         /* WHERE */ array(
1141                                 'old_namespace' => $this->getNamespace(),
1142                                 'old_title' => $this->getDBkey()
1143                         ), $fname
1144                 );
1145
1146                 # Record in RC
1147                 RecentChange::notifyMoveToNew( $now, $this, $nt, $wgUser, $comment );
1148
1149                 # Purge squid and linkscc as per article creation
1150                 Article::onArticleCreate( $nt );
1151
1152                 # Any text links to the old title must be reassigned to the redirect
1153                 $dbw->updateArray( 'links', array( 'l_to' => $newid ), array( 'l_to' => $oldid ), $fname );
1154                 LinkCache::linksccClearLinksTo( $oldid );
1155
1156                 # Record the just-created redirect's linking to the page
1157                 $dbw->insertArray( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ), $fname );
1158
1159                 # Non-existent target may have had broken links to it; these must
1160                 # now be removed and made into good links.
1161                 $update = new LinksUpdate( $oldid, $nt->getPrefixedDBkey() );
1162                 $update->fixBrokenLinks();
1163
1164                 # Purge old title from squid
1165                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1166                 $titles = $nt->getLinksTo();
1167                 if ( $wgUseSquid ) {
1168                         $urls = $this->getSquidURLs();
1169                         foreach ( $titles as $linkTitle ) {
1170                                 $urls[] = $linkTitle->getInternalURL();
1171                         }
1172                         $u = new SquidUpdate( $urls );
1173                         $u->doUpdate();
1174                 }
1175         }
1176
1177         # Checks if $this can be moved to $nt
1178         # Selects for update, so don't call it unless you mean business
1179         function isValidMoveTarget( $nt ) {
1180                 $fname = 'Title::isValidMoveTarget';
1181                 $dbw =& wfGetDB( DB_MASTER );
1182
1183                 # Is it a redirect?
1184                 $id  = $nt->getArticleID();
1185                 $obj = $dbw->getArray( 'cur', array( 'cur_is_redirect','cur_text' ),
1186                         array( 'cur_id' => $id ), $fname, 'FOR UPDATE' );
1187
1188                 if ( !$obj || 0 == $obj->cur_is_redirect ) {
1189                         # Not a redirect
1190                         return false;
1191                 }
1192
1193                 # Does the redirect point to the source?
1194                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $obj->cur_text, $m ) ) {
1195                         $redirTitle = Title::newFromText( $m[1] );
1196                         if( !is_object( $redirTitle ) ||
1197                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1198                                 return false;
1199                         }
1200                 }
1201
1202                 # Does the article have a history?
1203                 $row = $dbw->getArray( 'old', array( 'old_id' ),
1204                         array(
1205                                 'old_namespace' => $nt->getNamespace(),
1206                                 'old_title' => $nt->getDBkey()
1207                         ), $fname, 'FOR UPDATE'
1208                 );
1209
1210                 # Return true if there was no history
1211                 return $row === false;
1212         }
1213
1214         # Create a redirect, fails if the title already exists, does not notify RC
1215         # Returns success
1216         function createRedirect( $dest, $comment ) {
1217                 global $wgUser;
1218                 if ( $this->getArticleID() ) {
1219                         return false;
1220                 }
1221
1222                 $fname = 'Title::createRedirect';
1223                 $dbw =& wfGetDB( DB_MASTER );
1224                 $now = wfTimestampNow();
1225                 $won = wfInvertTimestamp( $now );
1226                 $seqVal = $dbw->nextSequenceValue( 'cur_cur_id_seq' );
1227
1228                 $dbw->insertArray( 'cur', array(
1229                         'cur_id' => $seqVal,
1230                         'cur_namespace' => $this->getNamespace(),
1231                         'cur_title' => $this->getDBkey(),
1232                         'cur_comment' => $comment,
1233                         'cur_user' => $wgUser->getID(),
1234                         'cur_user_text' => $wgUser->getName(),
1235                         'cur_timestamp' => $now,
1236                         'inverse_timestamp' => $won,
1237                         'cur_touched' => $now,
1238                         'cur_is_redirect' => 1,
1239                         'cur_is_new' => 1,
1240                         'cur_text' => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n"
1241                 ), $fname );
1242                 $newid = $dbw->insertId();
1243                 $this->resetArticleID( $newid );
1244
1245                 # Link table
1246                 if ( $dest->getArticleID() ) {
1247                         $dbw->insertArray( 'links',
1248                                 array(
1249                                         'l_to' => $dest->getArticleID(),
1250                                         'l_from' => $newid
1251                                 ), $fname
1252                         );
1253                 } else {
1254                         $dbw->insertArray( 'brokenlinks',
1255                                 array(
1256                                         'bl_to' => $dest->getPrefixedDBkey(),
1257                                         'bl_from' => $newid
1258                                 ), $fname
1259                         );
1260                 }
1261
1262                 Article::onArticleCreate( $this );
1263                 return true;
1264         }
1265
1266         # Get categories to wich belong this title and return an array of
1267         # categories names.
1268         # Return an array of parents in the form:
1269         #  $parent => $currentarticle
1270         function getParentCategories() {
1271                 global $wgLang,$wgUser;
1272
1273                 $titlekey = $this->getArticleId();
1274                 $sk =& $wgUser->getSkin();
1275                 $parents = array();
1276                 $dbr =& wfGetDB( DB_SLAVE );
1277                 $cur = $dbr->tableName( 'cur' );
1278                 $categorylinks = $dbr->tableName( 'categorylinks' );
1279
1280                 # NEW SQL
1281                 $sql = "SELECT * FROM categorylinks"
1282                      ." WHERE cl_from='$titlekey'"
1283                          ." AND cl_from <> '0'"
1284                          ." ORDER BY cl_sortkey";
1285
1286                 $res = $dbr->query ( $sql ) ;
1287
1288                 if($dbr->numRows($res) > 0) {
1289                         while ( $x = $dbr->fetchObject ( $res ) )
1290                                 //$data[] = Title::newFromText($wgLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
1291                                 $data[$wgLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
1292                         $dbr->freeResult ( $res ) ;
1293                 } else {
1294                         $data = '';
1295                 }
1296                 return $data;
1297         }
1298
1299         # Go through all parents
1300         function getCategorieBrowser() {
1301                 $parents = $this->getParentCategories();
1302
1303                 if($parents != '') {
1304                         foreach($parents as $parent => $current)
1305                         {
1306                                 $nt = Title::newFromText($parent);
1307                                 $stack[$parent] = $nt->getCategorieBrowser();
1308                         }
1309                         return $stack;
1310                 } else {
1311                         return array();
1312                 }
1313         }
1314
1315
1316         # Returns an associative array for selecting this title from cur
1317         function curCond() {
1318                 return array( 'cur_namespace' => $this->mNamespace, 'cur_title' => $this->mDbkeyform );
1319         }
1320
1321         function oldCond() {
1322                 return array( 'old_namespace' => $this->mNamespace, 'old_title' => $this->mDbkeyform );
1323         }
1324 }
1325 ?>