includes/Title.php

   1 <?php
   2 /**
   3  * See title.doc
   4  *
   5  */
   6
   7 require_once( 'normal/UtfNormal.php' );
   8
   9 /**
  10  *
  11  */
  12 $wgTitleInterwikiCache = array();
  13 define ( 'GAID_FOR_UPDATE', 1 );
  14
  15 /**
  16  * Title class
  17  * - Represents a title, which may contain an interwiki designation or namespace
  18  * - Can fetch various kinds of data from the database, albeit inefficiently.
  19  *
  20  * @todo migrate comments to phpdoc format
  21 */
  22 class Title {
  23         # All member variables should be considered private
  24         # Please use the accessor functions
  25
  26         var $mTextform;           # Text form (spaces not underscores) of the main part
  27         var $mUrlform;            # URL-encoded form of the main part
  28         var $mDbkeyform;          # Main part with underscores
  29         var $mNamespace;          # Namespace index, i.e. one of the NS_xxxx constants
  30         var $mInterwiki;          # Interwiki prefix (or null string)
  31         var $mFragment;           # Title fragment (i.e. the bit after the #)
  32         var $mArticleID;          # Article ID, fetched from the link cache on demand
  33         var $mRestrictions;       # Array of groups allowed to edit this article
  34                               # Only null or "sysop" are supported
  35         var $mRestrictionsLoaded; # Boolean for initialisation on demand
  36         var $mPrefixedText;       # Text form including namespace/interwiki, initialised on demand
  37         var $mDefaultNamespace;   # Namespace index when there is no namespace
  38                               # Zero except in {{transclusion}} tags
  39
  40 #----------------------------------------------------------------------------
  41 #   Construction
  42 #----------------------------------------------------------------------------
  43
  44         /* private */ function Title() {
  45                 $this->mInterwiki = $this->mUrlform =
  46                 $this->mTextform = $this->mDbkeyform = '';
  47                 $this->mArticleID = -1;
  48                 $this->mNamespace = 0;
  49                 $this->mRestrictionsLoaded = false;
  50                 $this->mRestrictions = array();
  51         $this->mDefaultNamespace = 0;
  52         }
  53
  54         # From a prefixed DB key
  55         /* static */ function newFromDBkey( $key ) {
  56                 $t = new Title();
  57                 $t->mDbkeyform = $key;
  58                 if( $t->secureAndSplit() )
  59                         return $t;
  60                 else
  61                         return NULL;
  62         }
  63
  64         # From text, such as what you would find in a link
  65         /* static */ function newFromText( $text, $defaultNamespace = 0 ) {
  66                 $fname = 'Title::newFromText';
  67                 wfProfileIn( $fname );
  68
  69                 if( is_object( $text ) ) {
  70                         wfDebugDieBacktrace( 'Called with object instead of string.' );
  71                 }
  72                 global $wgInputEncoding;
  73                 $text = do_html_entity_decode( $text, ENT_COMPAT, $wgInputEncoding );
  74
  75                 $text = wfMungeToUtf8( $text );
  76
  77
  78                 # What was this for? TS 2004-03-03
  79                 # $text = urldecode( $text );
  80
  81                 $t = new Title();
  82                 $t->mDbkeyform = str_replace( ' ', '_', $text );
  83                 $t->mDefaultNamespace = $defaultNamespace;
  84
  85                 wfProfileOut( $fname );
  86                 if ( !is_object( $t ) ) {
  87                         var_dump( debug_backtrace() );
  88                 }
  89                 if( $t->secureAndSplit() ) {
  90                         return $t;
  91                 } else {
  92                         return NULL;
  93                 }
  94         }
  95
  96         # From a URL-encoded title
  97         /* static */ function newFromURL( $url ) {
  98                 global $wgLang, $wgServer;
  99                 $t = new Title();
 100
 101                 # For compatibility with old buggy URLs. "+" is not valid in titles,
 102                 # but some URLs used it as a space replacement and they still come
 103                 # from some external search tools.
 104                 $s = str_replace( '+', ' ', $url );
 105
 106                 # For links that came from outside, check for alternate/legacy
 107                 # character encoding.
 108                 wfDebug( "Servr: $wgServer\n" );
 109                 if( empty( $_SERVER['HTTP_REFERER'] ) ||
 110                         strncmp($wgServer, $_SERVER['HTTP_REFERER'], strlen( $wgServer ) ) )
 111                 {
 112                         $s = $wgLang->checkTitleEncoding( $s );
 113                 } else {
 114                         wfDebug( "Refer: {$_SERVER['HTTP_REFERER']}\n" );
 115                 }
 116
 117                 $t->mDbkeyform = str_replace( ' ', '_', $s );
 118                 if( $t->secureAndSplit() ) {
 119                         # check that length of title is < cur_title size
 120                         $dbr =& wfGetDB( DB_SLAVE );
 121                         $maxSize = $dbr->textFieldSize( 'cur', 'cur_title' );
 122                         if ( $maxSize != -1 && strlen( $t->mDbkeyform ) > $maxSize ) {
 123                                 return NULL;
 124                         }
 125
 126                         return $t;
 127                 } else {
 128                         return NULL;
 129                 }
 130         }
 131
 132         # From a cur_id
 133         # This is inefficiently implemented, the cur row is requested but not
 134         # used for anything else
 135         /* static */ function newFromID( $id ) {
 136                 $fname = 'Title::newFromID';
 137                 $dbr =& wfGetDB( DB_SLAVE );
 138                 $row = $dbr->getArray( 'cur', array( 'cur_namespace', 'cur_title' ),
 139                         array( 'cur_id' => $id ), $fname );
 140                 if ( $row !== false ) {
 141                         $title = Title::makeTitle( $row->cur_namespace, $row->cur_title );
 142                 } else {
 143                         $title = NULL;
 144                 }
 145                 return $title;
 146         }
 147
 148         # From a namespace index and a DB key.
 149         # It's assumed that $ns and $title are *valid*, for instance when
 150         # they came directly from the database or a special page name.
 151         /* static */ function &makeTitle( $ns, $title ) {
 152                 $t =& new Title();
 153                 $t->mInterwiki = '';
 154                 $t->mFragment = '';
 155                 $t->mNamespace = $ns;
 156                 $t->mDbkeyform = $title;
 157                 $t->mArticleID = ( $ns >= 0 ) ? 0 : -1;
 158                 $t->mUrlform = wfUrlencode( $title );
 159                 $t->mTextform = str_replace( '_', ' ', $title );
 160                 return $t;
 161         }
 162
 163         # From a namespace index and a DB key.
 164         # These will be checked for validity, which is a bit slower
 165         # than makeTitle() but safer for user-provided data.
 166         /* static */ function makeTitleSafe( $ns, $title ) {
 167                 $t = new Title();
 168                 $t->mDbkeyform = Title::makeName( $ns, $title );
 169                 if( $t->secureAndSplit() ) {
 170                         return $t;
 171                 } else {
 172                         return NULL;
 173                 }
 174         }
 175
 176         /* static */ function newMainPage() {
 177                 return Title::newFromText( wfMsg( 'mainpage' ) );
 178         }
 179
 180         # Get the title object for a redirect
 181         # Returns NULL if the text is not a valid redirect
 182         /* static */ function newFromRedirect( $text ) {
 183                 global $wgMwRedir;
 184                 $rt = NULL;
 185                 if ( $wgMwRedir->matchStart( $text ) ) {
 186                         if ( preg_match( '/\\[\\[([^\\]\\|]+)[\\]\\|]/', $text, $m ) ) {
 187                                 # categories are escaped using : for example one can enter:
 188                                 # #REDIRECT [[:Category:Music]]. Need to remove it.
 189                                 if ( substr($m[1],0,1) == ':') {
 190                                         # We don't want to keep the ':'
 191                                         $m[1] = substr( $m[1], 1 );
 192                                 }
 193
 194                                 $rt = Title::newFromText( $m[1] );
 195                         }
 196                 }
 197                 return $rt;
 198         }
 199
 200 #----------------------------------------------------------------------------
 201 #       Static functions
 202 #----------------------------------------------------------------------------
 203
 204         # Get the prefixed DB key associated with an ID
 205         /* static */ function nameOf( $id ) {
 206                 $fname = 'Title::nameOf';
 207                 $dbr =& wfGetDB( DB_SLAVE );
 208
 209                 $s = $dbr->getArray( 'cur', array( 'cur_namespace','cur_title' ),  array( 'cur_id' => $id ), $fname );
 210                 if ( $s === false ) { return NULL; }
 211
 212                 $n = Title::makeName( $s->cur_namespace, $s->cur_title );
 213                 return $n;
 214         }
 215
 216         # Get a regex character class describing the legal characters in a link
 217         /* static */ function legalChars() {
 218                 # Missing characters:
 219                 #  * []|# Needed for link syntax
 220                 #  * % and + are corrupted by Apache when they appear in the path
 221                 #
 222                 # % seems to work though
 223                 #
 224                 # The problem with % is that URLs are double-unescaped: once by Apache's
 225                 # path conversion code, and again by PHP. So %253F, for example, becomes "?".
 226                 # Our code does not double-escape to compensate for this, indeed double escaping
 227                 # would break if the double-escaped title was passed in the query string
 228                 # rather than the path. This is a minor security issue because articles can be
 229                 # created such that they are hard to view or edit. -- TS
 230                 #
 231                 # Theoretically 0x80-0x9F of ISO 8859-1 should be disallowed, but
 232                 # this breaks interlanguage links
 233
 234                 $set = " %!\"$&'()*,\\-.\\/0-9:;=?@A-Z\\\\^_`a-z{}~\\x80-\\xFF";
 235                 return $set;
 236         }
 237
 238         # Returns a stripped-down a title string ready for the search index
 239         # Takes a namespace index and a text-form main part
 240         /* static */ function indexTitle( $ns, $title ) {
 241                 global $wgDBminWordLen, $wgLang;
 242                 require_once( 'SearchEngine.php' );
 243
 244                 $lc = SearchEngine::legalSearchChars() . '&#;';
 245                 $t = $wgLang->stripForSearch( $title );
 246                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 247                 $t = strtolower( $t );
 248
 249                 # Handle 's, s'
 250                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 251                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 252
 253                 $t = preg_replace( "/\\s+/", ' ', $t );
 254
 255                 if ( $ns == Namespace::getImage() ) {
 256                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 257                 }
 258                 return trim( $t );
 259         }
 260
 261         # Make a prefixed DB key from a DB key and a namespace index
 262         /* static */ function makeName( $ns, $title ) {
 263                 global $wgLang;
 264
 265                 $n = $wgLang->getNsText( $ns );
 266                 if ( '' == $n ) { return $title; }
 267                 else { return $n.':'.$title; }
 268         }
 269
 270         # Arguably static
 271         # Returns the URL associated with an interwiki prefix
 272         # The URL contains $1, which is replaced by the title
 273         function getInterwikiLink( $key ) {
 274                 global $wgMemc, $wgDBname, $wgInterwikiExpiry, $wgTitleInterwikiCache;
 275                 $fname = 'Title::getInterwikiLink';
 276                 $k = $wgDBname.':interwiki:'.$key;
 277
 278                 if( array_key_exists( $k, $wgTitleInterwikiCache ) )
 279                         return $wgTitleInterwikiCache[$k]->iw_url;
 280
 281                 $s = $wgMemc->get( $k );
 282                 # Ignore old keys with no iw_local
 283                 if( $s && isset( $s->iw_local ) ) {
 284                         $wgTitleInterwikiCache[$k] = $s;
 285                         return $s->iw_url;
 286                 }
 287                 $dbr =& wfGetDB( DB_SLAVE );
 288                 $res = $dbr->select( 'interwiki', array( 'iw_url', 'iw_local' ), array( 'iw_prefix' => $key ), $fname );
 289                 if(!$res) return '';
 290
 291                 $s = $dbr->fetchObject( $res );
 292                 if(!$s) {
 293                         # Cache non-existence: create a blank object and save it to memcached
 294                         $s = (object)false;
 295                         $s->iw_url = '';
 296                         $s->iw_local = 0;
 297                 }
 298                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 299                 $wgTitleInterwikiCache[$k] = $s;
 300                 return $s->iw_url;
 301         }
 302
 303         function isLocal() {
 304                 global $wgTitleInterwikiCache, $wgDBname;
 305
 306                 if ( $this->mInterwiki != '' ) {
 307                         # Make sure key is loaded into cache
 308                         $this->getInterwikiLink( $this->mInterwiki );
 309                         $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 310                         return (bool)($wgTitleInterwikiCache[$k]->iw_local);
 311                 } else {
 312                         return true;
 313                 }
 314         }
 315
 316         # Update the cur_touched field for an array of title objects
 317         # Inefficient unless the IDs are already loaded into the link cache
 318         /* static */ function touchArray( $titles, $timestamp = '' ) {
 319                 if ( count( $titles ) == 0 ) {
 320                         return;
 321                 }
 322                 if ( $timestamp == '' ) {
 323                         $timestamp = wfTimestampNow();
 324                 }
 325                 $dbw =& wfGetDB( DB_MASTER );
 326                 $cur = $dbw->tableName( 'cur' );
 327                 $sql = "UPDATE $cur SET cur_touched='{$timestamp}' WHERE cur_id IN (";
 328                 $first = true;
 329
 330                 foreach ( $titles as $title ) {
 331                         if ( ! $first ) {
 332                                 $sql .= ',';
 333                         }
 334                         $first = false;
 335                         $sql .= $title->getArticleID();
 336                 }
 337                 $sql .= ')';
 338                 if ( ! $first ) {
 339                         $dbw->query( $sql, 'Title::touchArray' );
 340                 }
 341         }
 342
 343 #----------------------------------------------------------------------------
 344 #       Other stuff
 345 #----------------------------------------------------------------------------
 346
 347         # Simple accessors
 348         # See the definitions at the top of this file
 349
 350         function getText() { return $this->mTextform; }
 351         function getPartialURL() { return $this->mUrlform; }
 352         function getDBkey() { return $this->mDbkeyform; }
 353         function getNamespace() { return $this->mNamespace; }
 354         function setNamespace( $n ) { $this->mNamespace = $n; }
 355         function getInterwiki() { return $this->mInterwiki; }
 356         function getFragment() { return $this->mFragment; }
 357         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 358
 359         # Get title for search index
 360         function getIndexTitle() {
 361                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 362         }
 363
 364         # Get prefixed title with underscores
 365         function getPrefixedDBkey() {
 366                 $s = $this->prefix( $this->mDbkeyform );
 367                 $s = str_replace( ' ', '_', $s );
 368                 return $s;
 369         }
 370
 371         # Get prefixed title with spaces
 372         # This is the form usually used for display
 373         function getPrefixedText() {
 374                 if ( empty( $this->mPrefixedText ) ) {
 375                         $s = $this->prefix( $this->mTextform );
 376                         $s = str_replace( '_', ' ', $s );
 377                         $this->mPrefixedText = $s;
 378                 }
 379                 return $this->mPrefixedText;
 380         }
 381
 382         # As getPrefixedText(), plus fragment.
 383         function getFullText() {
 384                 $text = $this->getPrefixedText();
 385                 if( '' != $this->mFragment ) {
 386                         $text .= '#' . $this->mFragment;
 387                 }
 388                 return $text;
 389         }
 390
 391         # Get a URL-encoded title (not an actual URL) including interwiki
 392         function getPrefixedURL() {
 393                 $s = $this->prefix( $this->mDbkeyform );
 394                 $s = str_replace( ' ', '_', $s );
 395
 396                 $s = wfUrlencode ( $s ) ;
 397
 398                 # Cleaning up URL to make it look nice -- is this safe?
 399                 $s = preg_replace( '/%3[Aa]/', ':', $s );
 400                 $s = preg_replace( '/%2[Ff]/', '/', $s );
 401                 $s = str_replace( '%28', '(', $s );
 402                 $s = str_replace( '%29', ')', $s );
 403
 404                 return $s;
 405         }
 406
 407         # Get a real URL referring to this title, with interwiki link and fragment
 408         function getFullURL( $query = '' ) {
 409                 global $wgLang, $wgArticlePath, $wgServer, $wgScript;
 410
 411                 if ( '' == $this->mInterwiki ) {
 412                         $p = $wgArticlePath;
 413                         return $wgServer . $this->getLocalUrl( $query );
 414                 } else {
 415                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 416                         $namespace = $wgLang->getNsText( $this->mNamespace );
 417                         if ( '' != $namespace ) {
 418                                 # Can this actually happen? Interwikis shouldn't be parsed.
 419                                 $namepace .= ':';
 420                         }
 421                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 422                         if ( '' != $this->mFragment ) {
 423                                 $url .= '#' . $this->mFragment;
 424                         }
 425                         return $url;
 426                 }
 427         }
 428
 429         # Get a URL with an optional query string, no fragment
 430         # * If $query=="", it will use $wgArticlePath
 431         # * Returns a full for an interwiki link, loses any query string
 432         # * Optionally adds the server and escapes for HTML
 433         # * Setting $query to "-" makes an old-style URL with nothing in the
 434         #   query except a title
 435
 436         function getURL() {
 437                 die( 'Call to obsolete obsolete function Title::getURL()' );
 438         }
 439
 440         function getLocalURL( $query = '' ) {
 441                 global $wgLang, $wgArticlePath, $wgScript;
 442
 443                 if ( $this->isExternal() ) {
 444                         return $this->getFullURL();
 445                 }
 446
 447                 $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 448                 if ( $query == '' ) {
 449                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 450                 } else {
 451                         if ( $query == '-' ) {
 452                                 $query = '';
 453                         }
 454                         if ( $wgScript != '' ) {
 455                                 $url = "{$wgScript}?title={$dbkey}&{$query}";
 456                         } else {
 457                                 # Top level wiki
 458                                 $url = "/{$dbkey}?{$query}";
 459                         }
 460                 }
 461                 return $url;
 462         }
 463
 464         function escapeLocalURL( $query = '' ) {
 465                 return htmlspecialchars( $this->getLocalURL( $query ) );
 466         }
 467
 468         function escapeFullURL( $query = '' ) {
 469                 return htmlspecialchars( $this->getFullURL( $query ) );
 470         }
 471
 472         function getInternalURL( $query = '' ) {
 473                 # Used in various Squid-related code, in case we have a different
 474                 # internal hostname for the server than the exposed one.
 475                 global $wgInternalServer;
 476                 return $wgInternalServer . $this->getLocalURL( $query );
 477         }
 478
 479         # Get the edit URL, or a null string if it is an interwiki link
 480         function getEditURL() {
 481                 global $wgServer, $wgScript;
 482
 483                 if ( '' != $this->mInterwiki ) { return ''; }
 484                 $s = $this->getLocalURL( 'action=edit' );
 485
 486                 return $s;
 487         }
 488
 489         # Get HTML-escaped displayable text
 490         # For the title field in <a> tags
 491         function getEscapedText() {
 492                 return htmlspecialchars( $this->getPrefixedText() );
 493         }
 494
 495         # Is the title interwiki?
 496         function isExternal() { return ( '' != $this->mInterwiki ); }
 497
 498         # Does the title correspond to a protected article?
 499         function isProtected() {
 500                 if ( -1 == $this->mNamespace ) { return true; }
 501                 $a = $this->getRestrictions();
 502                 if ( in_array( 'sysop', $a ) ) { return true; }
 503                 return false;
 504         }
 505
 506         # Is the page a log page, i.e. one where the history is messed up by
 507         # LogPage.php? This used to be used for suppressing diff links in recent
 508         # changes, but now that's done by setting a flag in the recentchanges
 509         # table. Hence, this probably is no longer used.
 510         function isLog() {
 511                 if ( $this->mNamespace != Namespace::getWikipedia() ) {
 512                         return false;
 513                 }
 514                 if ( ( 0 == strcmp( wfMsg( 'uploadlogpage' ), $this->mDbkeyform ) ) ||
 515                   ( 0 == strcmp( wfMsg( 'dellogpage' ), $this->mDbkeyform ) ) ) {
 516                         return true;
 517                 }
 518                 return false;
 519         }
 520
 521         # Is $wgUser is watching this page?
 522         function userIsWatching() {
 523                 global $wgUser;
 524
 525                 if ( -1 == $this->mNamespace ) { return false; }
 526                 if ( 0 == $wgUser->getID() ) { return false; }
 527
 528                 return $wgUser->isWatched( $this );
 529         }
 530
 531         # Can $wgUser edit this page?
 532         function userCanEdit() {
 533                 global $wgUser;
 534                 if ( -1 == $this->mNamespace ) { return false; }
 535                 if ( NS_MEDIAWIKI == $this->mNamespace && !$wgUser->isSysop() ) { return false; }
 536                 # if ( 0 == $this->getArticleID() ) { return false; }
 537                 if ( $this->mDbkeyform == '_' ) { return false; }
 538                 # protect global styles and js
 539                 if ( NS_MEDIAWIKI == $this->mNamespace
 540                      && preg_match("/\\.(css|js)$/", $this->mTextform )
 541                      && !$wgUser->isSysop() )
 542                 { return false; }
 543                 //if ( $this->isCssJsSubpage() and !$this->userCanEditCssJsSubpage() ) { return false; }
 544                 # protect css/js subpages of user pages
 545                 # XXX: this might be better using restrictions
 546                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
 547                 if( Namespace::getUser() == $this->mNamespace
 548                         and preg_match("/\\.(css|js)$/", $this->mTextform )
 549                         and !$wgUser->isSysop()
 550                         and !preg_match('/^'.preg_quote($wgUser->getName(), '/').'/', $this->mTextform) )
 551                 { return false; }
 552                 $ur = $wgUser->getRights();
 553                 foreach ( $this->getRestrictions() as $r ) {
 554                         if ( '' != $r && ( ! in_array( $r, $ur ) ) ) {
 555                                 return false;
 556                         }
 557                 }
 558                 return true;
 559         }
 560
 561         function userCanRead() {
 562                 global $wgUser;
 563                 global $wgWhitelistRead;
 564
 565                 if( 0 != $wgUser->getID() ) return true;
 566                 if( !is_array( $wgWhitelistRead ) ) return true;
 567
 568                 $name = $this->getPrefixedText();
 569                 if( in_array( $name, $wgWhitelistRead ) ) return true;
 570
 571                 # Compatibility with old settings
 572                 if( $this->getNamespace() == NS_MAIN ) {
 573                         if( in_array( ':' . $name, $wgWhitelistRead ) ) return true;
 574                 }
 575                 return false;
 576         }
 577
 578         function isCssJsSubpage() {
 579                 return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
 580         }
 581         function isCssSubpage() {
 582                 return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
 583         }
 584         function isJsSubpage() {
 585                 return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
 586         }
 587         function userCanEditCssJsSubpage() {
 588                 # protect css/js subpages of user pages
 589                 # XXX: this might be better using restrictions
 590                 global $wgUser;
 591                 return ( $wgUser->isSysop() or preg_match('/^'.preg_quote($wgUser->getName()).'/', $this->mTextform) );
 592         }
 593
 594         # Accessor/initialisation for mRestrictions
 595         function getRestrictions() {
 596                 $id = $this->getArticleID();
 597                 if ( 0 == $id ) { return array(); }
 598
 599                 if ( ! $this->mRestrictionsLoaded ) {
 600                         $dbr =& wfGetDB( DB_SLAVE );
 601                         $res = $dbr->getField( 'cur', 'cur_restrictions', 'cur_id='.$id );
 602                         $this->mRestrictions = explode( ',', trim( $res ) );
 603                         $this->mRestrictionsLoaded = true;
 604                 }
 605                 return $this->mRestrictions;
 606         }
 607
 608         # Is there a version of this page in the deletion archive?
 609         # Returns the number of archived revisions
 610         function isDeleted() {
 611                 $fname = 'Title::isDeleted';
 612                 $dbr =& wfGetDB( DB_SLAVE );
 613                 $n = $dbr->getField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
 614                         'ar_title' => $this->getDBkey() ), $fname );
 615                 return (int)$n;
 616         }
 617
 618         # Get the article ID from the link cache
 619         # $flags is a bit field, may be GAID_FOR_UPDATE to select for update
 620         function getArticleID( $flags = 0 ) {
 621                 global $wgLinkCache;
 622
 623                 if ( $flags & GAID_FOR_UPDATE ) {
 624                         $oldUpdate = $wgLinkCache->forUpdate( true );
 625                         $this->mArticleID = $wgLinkCache->addLinkObj( $this );
 626                         $wgLinkCache->forUpdate( $oldUpdate );
 627                 } else {
 628                         if ( -1 == $this->mArticleID ) {
 629                                 $this->mArticleID = $wgLinkCache->addLinkObj( $this );
 630                         }
 631                 }
 632                 return $this->mArticleID;
 633         }
 634
 635         # This clears some fields in this object, and clears any associated keys in the
 636         # "bad links" section of $wgLinkCache. This is called from Article::insertNewArticle()
 637         # to allow loading of the new cur_id. It's also called from Article::doDeleteArticle()
 638         function resetArticleID( $newid ) {
 639                 global $wgLinkCache;
 640                 $wgLinkCache->clearBadLink( $this->getPrefixedDBkey() );
 641
 642                 if ( 0 == $newid ) { $this->mArticleID = -1; }
 643                 else { $this->mArticleID = $newid; }
 644                 $this->mRestrictionsLoaded = false;
 645                 $this->mRestrictions = array();
 646         }
 647
 648         # Updates cur_touched
 649         # Called from LinksUpdate.php
 650         function invalidateCache() {
 651                 $now = wfTimestampNow();
 652                 $dbw =& wfGetDB( DB_MASTER );
 653                 $success = $dbw->updateArray( 'cur',
 654                         array( /* SET */
 655                                 'cur_touched' => wfTimestampNow()
 656                         ), array( /* WHERE */
 657                                 'cur_namespace' => $this->getNamespace() ,
 658                                 'cur_title' => $this->getDBkey()
 659                         ), 'Title::invalidateCache'
 660                 );
 661                 return $success;
 662         }
 663
 664         # Prefixes some arbitrary text with the namespace or interwiki prefix of this object
 665         /* private */ function prefix( $name ) {
 666                 global $wgLang;
 667
 668                 $p = '';
 669                 if ( '' != $this->mInterwiki ) {
 670                         $p = $this->mInterwiki . ':';
 671                 }
 672                 if ( 0 != $this->mNamespace ) {
 673                         $p .= $wgLang->getNsText( $this->mNamespace ) . ':';
 674                 }
 675                 return $p . $name;
 676         }
 677
 678         # Secure and split - main initialisation function for this object
 679         #
 680         # Assumes that mDbkeyform has been set, and is urldecoded
 681     # and uses underscores, but not otherwise munged.  This function
 682     # removes illegal characters, splits off the interwiki and
 683     # namespace prefixes, sets the other forms, and canonicalizes
 684     # everything.
 685         #
 686         /* private */ function secureAndSplit()
 687         {
 688                 global $wgLang, $wgLocalInterwiki, $wgCapitalLinks;
 689                 $fname = 'Title::secureAndSplit';
 690                 wfProfileIn( $fname );
 691
 692                 static $imgpre = false;
 693                 static $rxTc = false;
 694
 695                 # Initialisation
 696                 if ( $imgpre === false ) {
 697                         $imgpre = ':' . $wgLang->getNsText( Namespace::getImage() ) . ':';
 698                         # % is needed as well
 699                         $rxTc = '/[^' . Title::legalChars() . ']/';
 700                 }
 701
 702                 $this->mInterwiki = $this->mFragment = '';
 703                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
 704
 705                 # Clean up whitespace
 706                 #
 707                 $t = preg_replace( "/[\\s_]+/", '_', $this->mDbkeyform );
 708                 $t = preg_replace( '/^_*(.*?)_*$/', '$1', $t );
 709
 710                 if ( '' == $t ) {
 711                         wfProfileOut( $fname );
 712                         return false;
 713                 }
 714
 715                 global $wgUseLatin1;
 716                 if( !$wgUseLatin1 &&  false !== strpos( $t, UTF8_REPLACEMENT, $t ) ) {
 717                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
 718                         wfProfileOut( $fname );
 719                         return false;
 720                 }
 721
 722                 $this->mDbkeyform = $t;
 723                 $done = false;
 724
 725                 # :Image: namespace
 726                 if ( 0 == strncasecmp( $imgpre, $t, strlen( $imgpre ) ) ) {
 727                         $t = substr( $t, 1 );
 728                 }
 729
 730                 # Initial colon indicating main namespace
 731                 if ( ':' == $t{0} ) {
 732                         $r = substr( $t, 1 );
 733                         $this->mNamespace = NS_MAIN;
 734                 } else {
 735                         # Namespace or interwiki prefix
 736                         if ( preg_match( "/^(.+?)_*:_*(.*)$/", $t, $m ) ) {
 737                                 #$p = strtolower( $m[1] );
 738                                 $p = $m[1];
 739                                 $lowerNs = strtolower( $p );
 740                                 if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
 741                                         # Canonical namespace
 742                                         $t = $m[2];
 743                                         $this->mNamespace = $ns;
 744                                 } elseif ( $ns = $wgLang->getNsIndex( $lowerNs )) {
 745                                         # Ordinary namespace
 746                                         $t = $m[2];
 747                                         $this->mNamespace = $ns;
 748                                 } elseif ( $this->getInterwikiLink( $p ) ) {
 749                                         # Interwiki link
 750                                         $t = $m[2];
 751                                         $this->mInterwiki = $p;
 752
 753                                         if ( !preg_match( "/^([A-Za-z0-9_\\x80-\\xff]+):(.*)$/", $t, $m ) ) {
 754                                                 $done = true;
 755                                         } elseif($this->mInterwiki != $wgLocalInterwiki) {
 756                                                 $done = true;
 757                                         }
 758                                 }
 759                         }
 760                         $r = $t;
 761                 }
 762
 763                 # Redundant interwiki prefix to the local wiki
 764                 if ( 0 == strcmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
 765                         $this->mInterwiki = '';
 766                 }
 767                 # We already know that some pages won't be in the database!
 768                 #
 769                 if ( '' != $this->mInterwiki || -1 == $this->mNamespace ) {
 770                         $this->mArticleID = 0;
 771                 }
 772                 $f = strstr( $r, '#' );
 773                 if ( false !== $f ) {
 774                         $this->mFragment = substr( $f, 1 );
 775                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
 776                 }
 777
 778                 # Reject illegal characters.
 779                 #
 780                 if( preg_match( $rxTc, $r ) ) {
 781                         wfProfileOut( $fname );
 782                         return false;
 783                 }
 784
 785                 # "." and ".." conflict with the directories of those namesa
 786                 if ( strpos( $r, '.' ) !== false &&
 787                      ( $r === '.' || $r === '..' ||
 788                        strpos( $r, './' ) === 0  ||
 789                        strpos( $r, '../' ) === 0 ||
 790                        strpos( $r, '/./' ) !== false ||
 791                        strpos( $r, '/../' ) !== false ) )
 792                 {
 793                         wfProfileOut( $fname );
 794                         return false;
 795                 }
 796
 797                 # Initial capital letter
 798                 if( $wgCapitalLinks && $this->mInterwiki == '') {
 799                         $t = $wgLang->ucfirst( $r );
 800                 } else {
 801                         $t = $r;
 802                 }
 803
 804                 # Fill fields
 805                 $this->mDbkeyform = $t;
 806                 $this->mUrlform = wfUrlencode( $t );
 807
 808                 $this->mTextform = str_replace( '_', ' ', $t );
 809
 810                 wfProfileOut( $fname );
 811                 return true;
 812         }
 813
 814         # Get a title object associated with the talk page of this article
 815         function getTalkPage() {
 816                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
 817         }
 818
 819         # Get a title object associated with the subject page of this talk page
 820         function getSubjectPage() {
 821                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
 822         }
 823
 824         # Get an array of Title objects linking to this title
 825         # Also stores the IDs in the link cache
 826         # $options may be FOR UPDATE
 827         function getLinksTo( $options = '' ) {
 828                 global $wgLinkCache;
 829                 $id = $this->getArticleID();
 830
 831                 if ( $options ) {
 832                         $db =& wfGetDB( DB_MASTER );
 833                 } else {
 834                         $db =& wfGetDB( DB_SLAVE );
 835                 }
 836                 $cur = $db->tableName( 'cur' );
 837                 $links = $db->tableName( 'links' );
 838
 839                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM $cur,$links WHERE l_from=cur_id AND l_to={$id} $options";
 840                 $res = $db->query( $sql, 'Title::getLinksTo' );
 841                 $retVal = array();
 842                 if ( $db->numRows( $res ) ) {
 843                         while ( $row = $db->fetchObject( $res ) ) {
 844                                 if ( $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title ) ) {
 845                                         $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
 846                                         $retVal[] = $titleObj;
 847                                 }
 848                         }
 849                 }
 850                 $db->freeResult( $res );
 851                 return $retVal;
 852         }
 853
 854         # Get an array of Title objects linking to this non-existent title
 855         # Also stores the IDs in the link cache
 856         function getBrokenLinksTo( $options = '' ) {
 857                 global $wgLinkCache;
 858
 859                 if ( $options ) {
 860                         $db =& wfGetDB( DB_MASTER );
 861                 } else {
 862                         $db =& wfGetDB( DB_SLAVE );
 863                 }
 864                 $cur = $db->tableName( 'cur' );
 865                 $brokenlinks = $db->tableName( 'brokenlinks' );
 866                 $encTitle = $db->strencode( $this->getPrefixedDBkey() );
 867
 868                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM $brokenlinks,$cur " .
 869                   "WHERE bl_from=cur_id AND bl_to='$encTitle' $options";
 870                 $res = $db->query( $sql, "Title::getBrokenLinksTo" );
 871                 $retVal = array();
 872                 if ( $db->numRows( $res ) ) {
 873                         while ( $row = $db->fetchObject( $res ) ) {
 874                                 $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title );
 875                                 $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
 876                                 $retVal[] = $titleObj;
 877                         }
 878                 }
 879                 $db->freeResult( $res );
 880                 return $retVal;
 881         }
 882
 883         function getSquidURLs() {
 884                 return array(
 885                         $this->getInternalURL(),
 886                         $this->getInternalURL( 'action=history' )
 887                 );
 888         }
 889
 890         function moveNoAuth( &$nt ) {
 891                 return $this->moveTo( $nt, false );
 892         }
 893
 894         # Move a title to a new location
 895         # Returns true on success, message name on failure
 896         # auth indicates whether wgUser's permissions should be checked
 897         function moveTo( &$nt, $auth = true ) {
 898                 if( !$this or !$nt ) {
 899                         return 'badtitletext';
 900                 }
 901
 902                 $fname = 'Title::move';
 903                 $oldid = $this->getArticleID();
 904                 $newid = $nt->getArticleID();
 905
 906                 if ( strlen( $nt->getDBkey() ) < 1 ) {
 907                         return 'articleexists';
 908                 }
 909                 if ( ( ! Namespace::isMovable( $this->getNamespace() ) ) ||
 910                          ( '' == $this->getDBkey() ) ||
 911                          ( '' != $this->getInterwiki() ) ||
 912                          ( !$oldid ) ||
 913                      ( ! Namespace::isMovable( $nt->getNamespace() ) ) ||
 914                          ( '' == $nt->getDBkey() ) ||
 915                          ( '' != $nt->getInterwiki() ) ) {
 916                         return 'badarticleerror';
 917                 }
 918
 919                 if ( $auth && ( !$this->userCanEdit() || !$nt->userCanEdit() ) ) {
 920                         return 'protectedpage';
 921                 }
 922
 923                 # The move is allowed only if (1) the target doesn't exist, or
 924                 # (2) the target is a redirect to the source, and has no history
 925                 # (so we can undo bad moves right after they're done).
 926
 927                 if ( 0 != $newid ) { # Target exists; check for validity
 928                         if ( ! $this->isValidMoveTarget( $nt ) ) {
 929                                 return 'articleexists';
 930                         }
 931                         $this->moveOverExistingRedirect( $nt );
 932                 } else { # Target didn't exist, do normal move.
 933                         $this->moveToNewTitle( $nt, $newid );
 934                 }
 935
 936                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
 937
 938                 $dbw =& wfGetDB( DB_MASTER );
 939                 $sql = "UPDATE categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
 940                         " WHERE cl_from=" . $dbw->addQuotes( $this->getArticleID() ) .
 941                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
 942                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
 943
 944                 # Update watchlists
 945
 946                 $oldnamespace = $this->getNamespace() & ~1;
 947                 $newnamespace = $nt->getNamespace() & ~1;
 948                 $oldtitle = $this->getDBkey();
 949                 $newtitle = $nt->getDBkey();
 950
 951                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
 952                         WatchedItem::duplicateEntries( $this, $nt );
 953                 }
 954
 955                 # Update search engine
 956                 $u = new SearchUpdate( $oldid, $nt->getPrefixedDBkey() );
 957                 $u->doUpdate();
 958                 $u = new SearchUpdate( $newid, $this->getPrefixedDBkey(), '' );
 959                 $u->doUpdate();
 960
 961                 return true;
 962         }
 963
 964         # Move page to title which is presently a redirect to the source page
 965
 966         /* private */ function moveOverExistingRedirect( &$nt ) {
 967                 global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
 968                 $fname = 'Title::moveOverExistingRedirect';
 969                 $comment = wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
 970
 971         $now = wfTimestampNow();
 972         $won = wfInvertTimestamp( $now );
 973                 $newid = $nt->getArticleID();
 974                 $oldid = $this->getArticleID();
 975                 $dbw =& wfGetDB( DB_MASTER );
 976                 $links = $dbw->tableName( 'links' );
 977
 978                 # Change the name of the target page:
 979                 $dbw->updateArray( 'cur',
 980                         /* SET */ array(
 981                                 'cur_touched' => $now,
 982                                 'cur_namespace' => $nt->getNamespace(),
 983                                 'cur_title' => $nt->getDBkey()
 984                         ),
 985                         /* WHERE */ array( 'cur_id' => $oldid ),
 986                         $fname
 987                 );
 988                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
 989
 990                 # Repurpose the old redirect. We don't save it to history since
 991                 # by definition if we've got here it's rather uninteresting.
 992
 993                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
 994                 $dbw->updateArray( 'cur',
 995                         /* SET */ array(
 996                                 'cur_touched' => $now,
 997                                 'cur_timestamp' => $now,
 998                                 'inverse_timestamp' => $won,
 999                                 'cur_namespace' => $this->getNamespace(),
1000                                 'cur_title' => $this->getDBkey(),
1001                                 'cur_text' => $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n",
1002                                 'cur_comment' => $comment,
1003                                 'cur_user' => $wgUser->getID(),
1004                                 'cur_minor_edit' => 0,
1005                                 'cur_counter' => 0,
1006                                 'cur_restrictions' => '',
1007                                 'cur_user_text' => $wgUser->getName(),
1008                                 'cur_is_redirect' => 1,
1009                                 'cur_is_new' => 1
1010                         ),
1011                         /* WHERE */ array( 'cur_id' => $newid ),
1012                         $fname
1013                 );
1014
1015                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1016
1017                 # Fix the redundant names for the past revisions of the target page.
1018                 # The redirect should have no old revisions.
1019                 $dbw->updateArray(
1020                         /* table */ 'old',
1021                         /* SET */ array(
1022                                 'old_namespace' => $nt->getNamespace(),
1023                                 'old_title' => $nt->getDBkey(),
1024                         ),
1025                         /* WHERE */ array(
1026                                 'old_namespace' => $this->getNamespace(),
1027                                 'old_title' => $this->getDBkey(),
1028                         ),
1029                         $fname
1030                 );
1031
1032                 RecentChange::notifyMoveOverRedirect( $now, $this, $nt, $wgUser, $comment );
1033
1034                 # Swap links
1035
1036                 # Load titles and IDs
1037                 $linksToOld = $this->getLinksTo( 'FOR UPDATE' );
1038                 $linksToNew = $nt->getLinksTo( 'FOR UPDATE' );
1039
1040                 # Delete them all
1041                 $sql = "DELETE FROM $links WHERE l_to=$oldid OR l_to=$newid";
1042                 $dbw->query( $sql, $fname );
1043
1044                 # Reinsert
1045                 if ( count( $linksToOld ) || count( $linksToNew )) {
1046                         $sql = "INSERT INTO $links (l_from,l_to) VALUES ";
1047                         $first = true;
1048
1049                         # Insert links to old title
1050                         foreach ( $linksToOld as $linkTitle ) {
1051                                 if ( $first ) {
1052                                         $first = false;
1053                                 } else {
1054                                         $sql .= ',';
1055                                 }
1056                                 $id = $linkTitle->getArticleID();
1057                                 $sql .= "($id,$newid)";
1058                         }
1059
1060                         # Insert links to new title
1061                         foreach ( $linksToNew as $linkTitle ) {
1062                                 if ( $first ) {
1063                                         $first = false;
1064                                 } else {
1065                                         $sql .= ',';
1066                                 }
1067                                 $id = $linkTitle->getArticleID();
1068                                 $sql .= "($id, $oldid)";
1069                         }
1070
1071                         $dbw->query( $sql, DB_MASTER, $fname );
1072                 }
1073
1074                 # Now, we record the link from the redirect to the new title.
1075                 # It should have no other outgoing links...
1076                 $dbw->delete( 'links', array( 'l_from' => $newid ) );
1077                 $dbw->insertArray( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ) );
1078
1079                 # Clear linkscc
1080                 LinkCache::linksccClearLinksTo( $oldid );
1081                 LinkCache::linksccClearLinksTo( $newid );
1082
1083                 # Purge squid
1084                 if ( $wgUseSquid ) {
1085                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1086                         $u = new SquidUpdate( $urls );
1087                         $u->doUpdate();
1088                 }
1089         }
1090
1091         # Move page to non-existing title.
1092         # Sets $newid to be the new article ID
1093
1094         /* private */ function moveToNewTitle( &$nt, &$newid ) {
1095                 global $wgUser, $wgLinkCache, $wgUseSquid;
1096                 $fname = 'MovePageForm::moveToNewTitle';
1097                 $comment = wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1098
1099                 $now = wfTimestampNow();
1100                 $won = wfInvertTimestamp( $now );
1101                 $newid = $nt->getArticleID();
1102                 $oldid = $this->getArticleID();
1103                 $dbw =& wfGetDB( DB_MASTER );
1104
1105                 # Rename cur entry
1106                 $dbw->updateArray( 'cur',
1107                         /* SET */ array(
1108                                 'cur_touched' => $now,
1109                                 'cur_namespace' => $nt->getNamespace(),
1110                                 'cur_title' => $nt->getDBkey()
1111                         ),
1112                         /* WHERE */ array( 'cur_id' => $oldid ),
1113                         $fname
1114                 );
1115
1116                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1117
1118                 # Insert redirct
1119                 $dbw->insertArray( 'cur', array(
1120                         'cur_namespace' => $this->getNamespace(),
1121                         'cur_title' => $this->getDBkey(),
1122                         'cur_comment' => $comment,
1123                         'cur_user' => $wgUser->getID(),
1124                         'cur_user_text' => $wgUser->getName(),
1125                         'cur_timestamp' => $now,
1126                         'inverse_timestamp' => $won,
1127                         'cur_touched' => $now,
1128                         'cur_is_redirect' => 1,
1129                         'cur_is_new' => 1,
1130                         'cur_text' => "#REDIRECT [[" . $nt->getPrefixedText() . "]]\n" ), $fname
1131                 );
1132                 $newid = $dbw->insertId();
1133                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1134
1135                 # Rename old entries
1136                 $dbw->updateArray(
1137                         /* table */ 'old',
1138                         /* SET */ array(
1139                                 'old_namespace' => $nt->getNamespace(),
1140                                 'old_title' => $nt->getDBkey()
1141                         ),
1142                         /* WHERE */ array(
1143                                 'old_namespace' => $this->getNamespace(),
1144                                 'old_title' => $this->getDBkey()
1145                         ), $fname
1146                 );
1147
1148                 # Record in RC
1149                 RecentChange::notifyMoveToNew( $now, $this, $nt, $wgUser, $comment );
1150
1151                 # Purge squid and linkscc as per article creation
1152                 Article::onArticleCreate( $nt );
1153
1154                 # Any text links to the old title must be reassigned to the redirect
1155                 $dbw->updateArray( 'links', array( 'l_to' => $newid ), array( 'l_to' => $oldid ), $fname );
1156                 LinkCache::linksccClearLinksTo( $oldid );
1157
1158                 # Record the just-created redirect's linking to the page
1159                 $dbw->insertArray( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ), $fname );
1160
1161                 # Non-existent target may have had broken links to it; these must
1162                 # now be removed and made into good links.
1163                 $update = new LinksUpdate( $oldid, $nt->getPrefixedDBkey() );
1164                 $update->fixBrokenLinks();
1165
1166                 # Purge old title from squid
1167                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1168                 $titles = $nt->getLinksTo();
1169                 if ( $wgUseSquid ) {
1170                         $urls = $this->getSquidURLs();
1171                         foreach ( $titles as $linkTitle ) {
1172                                 $urls[] = $linkTitle->getInternalURL();
1173                         }
1174                         $u = new SquidUpdate( $urls );
1175                         $u->doUpdate();
1176                 }
1177         }
1178
1179         # Checks if $this can be moved to $nt
1180         # Selects for update, so don't call it unless you mean business
1181         function isValidMoveTarget( $nt ) {
1182                 $fname = 'Title::isValidMoveTarget';
1183                 $dbw =& wfGetDB( DB_MASTER );
1184
1185                 # Is it a redirect?
1186                 $id  = $nt->getArticleID();
1187                 $obj = $dbw->getArray( 'cur', array( 'cur_is_redirect','cur_text' ),
1188                         array( 'cur_id' => $id ), $fname, 'FOR UPDATE' );
1189
1190                 if ( !$obj || 0 == $obj->cur_is_redirect ) {
1191                         # Not a redirect
1192                         return false;
1193                 }
1194
1195                 # Does the redirect point to the source?
1196                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $obj->cur_text, $m ) ) {
1197                         $redirTitle = Title::newFromText( $m[1] );
1198                         if( !is_object( $redirTitle ) ||
1199                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1200                                 return false;
1201                         }
1202                 }
1203
1204                 # Does the article have a history?
1205                 $row = $dbw->getArray( 'old', array( 'old_id' ),
1206                         array(
1207                                 'old_namespace' => $nt->getNamespace(),
1208                                 'old_title' => $nt->getDBkey()
1209                         ), $fname, 'FOR UPDATE'
1210                 );
1211
1212                 # Return true if there was no history
1213                 return $row === false;
1214         }
1215
1216         # Create a redirect, fails if the title already exists, does not notify RC
1217         # Returns success
1218         function createRedirect( $dest, $comment ) {
1219                 global $wgUser;
1220                 if ( $this->getArticleID() ) {
1221                         return false;
1222                 }
1223
1224                 $fname = 'Title::createRedirect';
1225                 $dbw =& wfGetDB( DB_MASTER );
1226                 $now = wfTimestampNow();
1227                 $won = wfInvertTimestamp( $now );
1228                 $seqVal = $dbw->nextSequenceValue( 'cur_cur_id_seq' );
1229
1230                 $dbw->insertArray( 'cur', array(
1231                         'cur_id' => $seqVal,
1232                         'cur_namespace' => $this->getNamespace(),
1233                         'cur_title' => $this->getDBkey(),
1234                         'cur_comment' => $comment,
1235                         'cur_user' => $wgUser->getID(),
1236                         'cur_user_text' => $wgUser->getName(),
1237                         'cur_timestamp' => $now,
1238                         'inverse_timestamp' => $won,
1239                         'cur_touched' => $now,
1240                         'cur_is_redirect' => 1,
1241                         'cur_is_new' => 1,
1242                         'cur_text' => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n"
1243                 ), $fname );
1244                 $newid = $dbw->insertId();
1245                 $this->resetArticleID( $newid );
1246
1247                 # Link table
1248                 if ( $dest->getArticleID() ) {
1249                         $dbw->insertArray( 'links',
1250                                 array(
1251                                         'l_to' => $dest->getArticleID(),
1252                                         'l_from' => $newid
1253                                 ), $fname
1254                         );
1255                 } else {
1256                         $dbw->insertArray( 'brokenlinks',
1257                                 array(
1258                                         'bl_to' => $dest->getPrefixedDBkey(),
1259                                         'bl_from' => $newid
1260                                 ), $fname
1261                         );
1262                 }
1263
1264                 Article::onArticleCreate( $this );
1265                 return true;
1266         }
1267
1268         # Get categories to wich belong this title and return an array of
1269         # categories names.
1270         # Return an array of parents in the form:
1271         #  $parent => $currentarticle
1272         function getParentCategories() {
1273                 global $wgLang,$wgUser;
1274
1275                 $titlekey = $this->getArticleId();
1276                 $sk =& $wgUser->getSkin();
1277                 $parents = array();
1278                 $dbr =& wfGetDB( DB_SLAVE );
1279                 $cur = $dbr->tableName( 'cur' );
1280                 $categorylinks = $dbr->tableName( 'categorylinks' );
1281
1282                 # NEW SQL
1283                 $sql = "SELECT * FROM categorylinks"
1284                      ." WHERE cl_from='$titlekey'"
1285                          ." AND cl_from <> '0'"
1286                          ." ORDER BY cl_sortkey";
1287
1288                 $res = $dbr->query ( $sql ) ;
1289
1290                 if($dbr->numRows($res) > 0) {
1291                         while ( $x = $dbr->fetchObject ( $res ) )
1292                                 //$data[] = Title::newFromText($wgLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
1293                                 $data[$wgLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
1294                         $dbr->freeResult ( $res ) ;
1295                 } else {
1296                         $data = '';
1297                 }
1298                 return $data;
1299         }
1300
1301         # Go through all parents
1302         function getCategorieBrowser() {
1303                 $parents = $this->getParentCategories();
1304
1305                 if($parents != '') {
1306                         foreach($parents as $parent => $current)
1307                         {
1308                                 $nt = Title::newFromText($parent);
1309                                 $stack[$parent] = $nt->getCategorieBrowser();
1310                         }
1311                         return $stack;
1312                 } else {
1313                         return array();
1314                 }
1315         }
1316
1317
1318         # Returns an associative array for selecting this title from cur
1319         function curCond() {
1320                 return array( 'cur_namespace' => $this->mNamespace, 'cur_title' => $this->mDbkeyform );
1321         }
1322
1323         function oldCond() {
1324                 return array( 'old_namespace' => $this->mNamespace, 'old_title' => $this->mDbkeyform );
1325         }
1326 }
1327 ?>