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 $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  * @package MediaWiki
  21  */
  22 class Title {
  23         /**
  24          * All member variables should be considered private
  25          * Please use the accessor functions
  26          */
  27
  28          /**#@+
  29          * @access private
  30          */
  31
  32         var $mTextform;           # Text form (spaces not underscores) of the main part
  33         var $mUrlform;            # URL-encoded form of the main part
  34         var $mDbkeyform;          # Main part with underscores
  35         var $mNamespace;          # Namespace index, i.e. one of the NS_xxxx constants
  36         var $mInterwiki;          # Interwiki prefix (or null string)
  37         var $mFragment;           # Title fragment (i.e. the bit after the #)
  38         var $mArticleID;          # Article ID, fetched from the link cache on demand
  39         var $mRestrictions;       # Array of groups allowed to edit this article
  40                               # Only null or "sysop" are supported
  41         var $mRestrictionsLoaded; # Boolean for initialisation on demand
  42         var $mPrefixedText;       # Text form including namespace/interwiki, initialised on demand
  43         var $mDefaultNamespace;   # Namespace index when there is no namespace
  44                               # Zero except in {{transclusion}} tags
  45         /**#@-*/
  46
  47
  48         /**
  49          * Constructor
  50          * @access private
  51          */
  52         /* private */ function Title() {
  53                 $this->mInterwiki = $this->mUrlform =
  54                 $this->mTextform = $this->mDbkeyform = '';
  55                 $this->mArticleID = -1;
  56                 $this->mNamespace = 0;
  57                 $this->mRestrictionsLoaded = false;
  58                 $this->mRestrictions = array();
  59                 $this->mDefaultNamespace = 0;
  60         }
  61
  62         /**
  63          * Create a new Title from a prefixed DB key
  64          * @param string $key The database key, which has underscores
  65          *      instead of spaces, possibly including namespace and
  66          *      interwiki prefixes
  67          * @return Title the new object, or NULL on an error
  68          * @static
  69          * @access public
  70          */
  71         /* static */ function newFromDBkey( $key ) {
  72                 $t = new Title();
  73                 $t->mDbkeyform = $key;
  74                 if( $t->secureAndSplit() )
  75                         return $t;
  76                 else
  77                         return NULL;
  78         }
  79
  80         /**
  81          * Create a new Title from text, such as what one would
  82          * find in a link. Decodes any HTML entities in the text.
  83          *
  84          * @param string $text the link text; spaces, prefixes,
  85          *      and an initial ':' indicating the main namespace
  86          *      are accepted
  87          * @param int $defaultNamespace the namespace to use if
  88          *      none is specified by a prefix
  89          * @return Title the new object, or NULL on an error
  90          * @static
  91          * @access public
  92          */
  93         /* static */ function newFromText( $text, $defaultNamespace = 0 ) {
  94                 $fname = 'Title::newFromText';
  95                 wfProfileIn( $fname );
  96
  97                 if( is_object( $text ) ) {
  98                         wfDebugDieBacktrace( 'Called with object instead of string.' );
  99                 }
 100                 global $wgInputEncoding;
 101                 $text = do_html_entity_decode( $text, ENT_COMPAT, $wgInputEncoding );
 102
 103                 $text = wfMungeToUtf8( $text );
 104
 105
 106                 # What was this for? TS 2004-03-03
 107                 # $text = urldecode( $text );
 108
 109                 $t = new Title();
 110                 $t->mDbkeyform = str_replace( ' ', '_', $text );
 111                 $t->mDefaultNamespace = $defaultNamespace;
 112
 113                 wfProfileOut( $fname );
 114                 if ( !is_object( $t ) ) {
 115                         var_dump( debug_backtrace() );
 116                 }
 117                 if( $t->secureAndSplit() ) {
 118                         return $t;
 119                 } else {
 120                         return NULL;
 121                 }
 122         }
 123
 124         /**
 125          * Create a new Title from URL-encoded text. Ensures that
 126          * the given title's length does not exceed the maximum.
 127          * @param string $url the title, as might be taken from a URL
 128          * @return Title the new object, or NULL on an error
 129          * @static
 130          * @access public
 131          */
 132         /* static */ function newFromURL( $url ) {
 133                 global $wgLang, $wgServer;
 134                 $t = new Title();
 135
 136                 # For compatibility with old buggy URLs. "+" is not valid in titles,
 137                 # but some URLs used it as a space replacement and they still come
 138                 # from some external search tools.
 139                 $s = str_replace( '+', ' ', $url );
 140
 141                 $t->mDbkeyform = str_replace( ' ', '_', $s );
 142                 if( $t->secureAndSplit() ) {
 143                         # check that length of title is < cur_title size
 144                         $dbr =& wfGetDB( DB_SLAVE );
 145                         $maxSize = $dbr->textFieldSize( 'cur', 'cur_title' );
 146                         if ( $maxSize != -1 && strlen( $t->mDbkeyform ) > $maxSize ) {
 147                                 return NULL;
 148                         }
 149
 150                         return $t;
 151                 } else {
 152                         return NULL;
 153                 }
 154         }
 155
 156         /**
 157          * Create a new Title from an article ID
 158          * @todo This is inefficiently implemented, the cur row is requested
 159          * but not used for anything else
 160          * @param int $id the cur_id corresponding to the Title to create
 161          * @return Title the new object, or NULL on an error
 162          * @access public
 163          */
 164         /* static */ function newFromID( $id ) {
 165                 $fname = 'Title::newFromID';
 166                 $dbr =& wfGetDB( DB_SLAVE );
 167                 $row = $dbr->getArray( 'cur', array( 'cur_namespace', 'cur_title' ),
 168                         array( 'cur_id' => $id ), $fname );
 169                 if ( $row !== false ) {
 170                         $title = Title::makeTitle( $row->cur_namespace, $row->cur_title );
 171                 } else {
 172                         $title = NULL;
 173                 }
 174                 return $title;
 175         }
 176
 177         /**
 178          * Create a new Title from a namespace index and a DB key.
 179          * It's assumed that $ns and $title are *valid*, for instance when
 180          * they came directly from the database or a special page name.
 181          * @param int $ns the namespace of the article
 182          * @param string $title the unprefixed database key form
 183          * @return Title the new object
 184          * @static
 185          * @access public
 186          */
 187         /* static */ function &makeTitle( $ns, $title ) {
 188                 $t =& new Title();
 189                 $t->mInterwiki = '';
 190                 $t->mFragment = '';
 191                 $t->mNamespace = IntVal( $ns );
 192                 $t->mDbkeyform = $title;
 193                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 194                 $t->mUrlform = wfUrlencode( $title );
 195                 $t->mTextform = str_replace( '_', ' ', $title );
 196                 return $t;
 197         }
 198
 199         /**
 200          * Create a new Title frrom a namespace index and a DB key.
 201          * The parameters will be checked for validity, which is a bit slower
 202          * than makeTitle() but safer for user-provided data.
 203          * @param int $ns the namespace of the article
 204          * @param string $title the database key form
 205          * @return Title the new object, or NULL on an error
 206          * @static
 207          * @access public
 208          */
 209         /* static */ function makeTitleSafe( $ns, $title ) {
 210                 $t = new Title();
 211                 $t->mDbkeyform = Title::makeName( $ns, $title );
 212                 if( $t->secureAndSplit() ) {
 213                         return $t;
 214                 } else {
 215                         return NULL;
 216                 }
 217         }
 218
 219         /**
 220          * Create a new Title for the Main Page
 221          * @static
 222          * @return Title the new object
 223          * @access public
 224          */
 225         /* static */ function newMainPage() {
 226                 return Title::newFromText( wfMsgForContent( 'mainpage' ) );
 227         }
 228
 229         /**
 230          * Create a new Title for a redirect
 231          * @param string $text the redirect title text
 232          * @return Title the new object, or NULL if the text is not a
 233          *      valid redirect
 234          * @static
 235          * @access public
 236          */
 237         /* static */ function newFromRedirect( $text ) {
 238                 global $wgMwRedir;
 239                 $rt = NULL;
 240                 if ( $wgMwRedir->matchStart( $text ) ) {
 241                         if ( preg_match( '/\\[\\[([^\\]\\|]+)[\\]\\|]/', $text, $m ) ) {
 242                                 # categories are escaped using : for example one can enter:
 243                                 # #REDIRECT [[:Category:Music]]. Need to remove it.
 244                                 if ( substr($m[1],0,1) == ':') {
 245                                         # We don't want to keep the ':'
 246                                         $m[1] = substr( $m[1], 1 );
 247                                 }
 248
 249                                 $rt = Title::newFromText( $m[1] );
 250                                 # Disallow redirects to Special:Userlogout
 251                                 if ( !is_null($rt) && $rt->getNamespace() == NS_SPECIAL && preg_match( '/^Userlogout/i', $rt->getText() ) ) {
 252                                         $rt = NULL;
 253                                 }
 254                         }
 255                 }
 256                 return $rt;
 257         }
 258
 259 #----------------------------------------------------------------------------
 260 #       Static functions
 261 #----------------------------------------------------------------------------
 262
 263         /**
 264          * Get the prefixed DB key associated with an ID
 265          * @param int $id the cur_id of the article
 266          * @return Title an object representing the article, or NULL
 267          *      if no such article was found
 268          * @static
 269          * @access public
 270          */
 271         /* static */ function nameOf( $id ) {
 272                 $fname = 'Title::nameOf';
 273                 $dbr =& wfGetDB( DB_SLAVE );
 274
 275                 $s = $dbr->getArray( 'cur', array( 'cur_namespace','cur_title' ),  array( 'cur_id' => $id ), $fname );
 276                 if ( $s === false ) { return NULL; }
 277
 278                 $n = Title::makeName( $s->cur_namespace, $s->cur_title );
 279                 return $n;
 280         }
 281
 282         /**
 283          * Get a regex character class describing the legal characters in a link
 284          * @return string the list of characters, not delimited
 285          * @static
 286          * @access public
 287          */
 288         /* static */ function legalChars() {
 289                 # Missing characters:
 290                 #  * []|# Needed for link syntax
 291                 #  * % and + are corrupted by Apache when they appear in the path
 292                 #
 293                 # % seems to work though
 294                 #
 295                 # The problem with % is that URLs are double-unescaped: once by Apache's
 296                 # path conversion code, and again by PHP. So %253F, for example, becomes "?".
 297                 # Our code does not double-escape to compensate for this, indeed double escaping
 298                 # would break if the double-escaped title was passed in the query string
 299                 # rather than the path. This is a minor security issue because articles can be
 300                 # created such that they are hard to view or edit. -- TS
 301                 #
 302                 # Theoretically 0x80-0x9F of ISO 8859-1 should be disallowed, but
 303                 # this breaks interlanguage links
 304
 305                 $set = " %!\"$&'()*,\\-.\\/0-9:;=?@A-Z\\\\^_`a-z~\\x80-\\xFF";
 306                 return $set;
 307         }
 308
 309         /**
 310          * Get a string representation of a title suitable for
 311          * including in a search index
 312          *
 313          * @param int $ns a namespace index
 314          * @param string $title text-form main part
 315          * @return string a stripped-down title string ready for the
 316          *      search index
 317          */
 318         /* static */ function indexTitle( $ns, $title ) {
 319                 global $wgDBminWordLen, $wgContLang;
 320                 require_once( 'SearchEngine.php' );
 321
 322                 $lc = SearchEngine::legalSearchChars() . '&#;';
 323                 $t = $wgContLang->stripForSearch( $title );
 324                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 325                 $t = strtolower( $t );
 326
 327                 # Handle 's, s'
 328                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 329                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 330
 331                 $t = preg_replace( "/\\s+/", ' ', $t );
 332
 333                 if ( $ns == Namespace::getImage() ) {
 334                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 335                 }
 336                 return trim( $t );
 337         }
 338
 339         /*
 340          * Make a prefixed DB key from a DB key and a namespace index
 341          * @param int $ns numerical representation of the namespace
 342          * @param string $title the DB key form the title
 343          * @return string the prefixed form of the title
 344          */
 345         /* static */ function makeName( $ns, $title ) {
 346                 global $wgContLang;
 347
 348                 $n = $wgContLang->getNsText( $ns );
 349                 if ( '' == $n ) { return $title; }
 350                 else { return $n.':'.$title; }
 351         }
 352
 353         /**
 354          * Returns the URL associated with an interwiki prefix
 355          * @param string $key the interwiki prefix (e.g. "MeatBall")
 356          * @return the associated URL, containing "$1", which should be
 357          *      replaced by an article title
 358          * @static (arguably)
 359          * @access public
 360          */
 361         function getInterwikiLink( $key ) {
 362                 global $wgMemc, $wgDBname, $wgInterwikiExpiry, $wgTitleInterwikiCache;
 363                 $fname = 'Title::getInterwikiLink';
 364                 $k = $wgDBname.':interwiki:'.$key;
 365
 366                 if( array_key_exists( $k, $wgTitleInterwikiCache ) )
 367                         return $wgTitleInterwikiCache[$k]->iw_url;
 368
 369                 $s = $wgMemc->get( $k );
 370                 # Ignore old keys with no iw_local
 371                 if( $s && isset( $s->iw_local ) ) {
 372                         $wgTitleInterwikiCache[$k] = $s;
 373                         return $s->iw_url;
 374                 }
 375                 $dbr =& wfGetDB( DB_SLAVE );
 376                 $res = $dbr->select( 'interwiki', array( 'iw_url', 'iw_local' ), array( 'iw_prefix' => $key ), $fname );
 377                 if(!$res) return '';
 378
 379                 $s = $dbr->fetchObject( $res );
 380                 if(!$s) {
 381                         # Cache non-existence: create a blank object and save it to memcached
 382                         $s = (object)false;
 383                         $s->iw_url = '';
 384                         $s->iw_local = 0;
 385                 }
 386                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 387                 $wgTitleInterwikiCache[$k] = $s;
 388                 return $s->iw_url;
 389         }
 390
 391         /**
 392          * Determine whether the object refers to a page within
 393          * this project.
 394          *
 395          * @return bool TRUE if this is an in-project interwiki link
 396          *      or a wikilink, FALSE otherwise
 397          * @access public
 398          */
 399         function isLocal() {
 400                 global $wgTitleInterwikiCache, $wgDBname;
 401
 402                 if ( $this->mInterwiki != '' ) {
 403                         # Make sure key is loaded into cache
 404                         $this->getInterwikiLink( $this->mInterwiki );
 405                         $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 406                         return (bool)($wgTitleInterwikiCache[$k]->iw_local);
 407                 } else {
 408                         return true;
 409                 }
 410         }
 411
 412         /**
 413          * Update the cur_touched field for an array of title objects
 414          * @todo Inefficient unless the IDs are already loaded into the
 415          *      link cache
 416          * @param array $titles an array of Title objects to be touched
 417          * @param string $timestamp the timestamp to use instead of the
 418          *      default current time
 419          * @static
 420          * @access public
 421          */
 422         /* static */ function touchArray( $titles, $timestamp = '' ) {
 423                 if ( count( $titles ) == 0 ) {
 424                         return;
 425                 }
 426                 $dbw =& wfGetDB( DB_MASTER );
 427                 if ( $timestamp == '' ) {
 428                         $timestamp = $dbw->timestamp();
 429                 }
 430                 $cur = $dbw->tableName( 'cur' );
 431                 $sql = "UPDATE $cur SET cur_touched='{$timestamp}' WHERE cur_id IN (";
 432                 $first = true;
 433
 434                 foreach ( $titles as $title ) {
 435                         if ( ! $first ) {
 436                                 $sql .= ',';
 437                         }
 438                         $first = false;
 439                         $sql .= $title->getArticleID();
 440                 }
 441                 $sql .= ')';
 442                 if ( ! $first ) {
 443                         $dbw->query( $sql, 'Title::touchArray' );
 444                 }
 445         }
 446
 447 #----------------------------------------------------------------------------
 448 #       Other stuff
 449 #----------------------------------------------------------------------------
 450
 451         /** Simple accessors */
 452         /**
 453          * Get the text form (spaces not underscores) of the main part
 454          * @return string
 455          * @access public
 456          */
 457         function getText() { return $this->mTextform; }
 458         /**
 459          * Get the URL-encoded form of the main part
 460          * @return string
 461          * @access public
 462          */
 463         function getPartialURL() { return $this->mUrlform; }
 464         /**
 465          * Get the main part with underscores
 466          * @return string
 467          * @access public
 468          */
 469         function getDBkey() { return $this->mDbkeyform; }
 470         /**
 471          * Get the namespace index, i.e. one of the NS_xxxx constants
 472          * @return int
 473          * @access public
 474          */
 475         function getNamespace() { return $this->mNamespace; }
 476         /**
 477          * Set the namespace index
 478          * @param int $n the namespace index, one of the NS_xxxx constants
 479          * @access public
 480          */
 481         function setNamespace( $n ) { $this->mNamespace = IntVal( $n ); }
 482         /**
 483          * Get the interwiki prefix (or null string)
 484          * @return string
 485          * @access public
 486          */
 487         function getInterwiki() { return $this->mInterwiki; }
 488         /**
 489          * Get the Title fragment (i.e. the bit after the #)
 490          * @return string
 491          * @access public
 492          */
 493         function getFragment() { return $this->mFragment; }
 494         /**
 495          * Get the default namespace index, for when there is no namespace
 496          * @return int
 497          * @access public
 498          */
 499         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 500
 501         /**
 502          * Get title for search index
 503          * @return string a stripped-down title string ready for the
 504          *      search index
 505          */
 506         function getIndexTitle() {
 507                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 508         }
 509
 510         /**
 511          * Get the prefixed database key form
 512          * @return string the prefixed title, with underscores and
 513          *      any interwiki and namespace prefixes
 514          * @access public
 515          */
 516         function getPrefixedDBkey() {
 517                 $s = $this->prefix( $this->mDbkeyform );
 518                 $s = str_replace( ' ', '_', $s );
 519                 return $s;
 520         }
 521
 522         /**
 523          * Get the prefixed title with spaces.
 524          * This is the form usually used for display
 525          * @return string the prefixed title, with spaces
 526          * @access public
 527          */
 528         function getPrefixedText() {
 529                 global $wgContLang;
 530                 if ( empty( $this->mPrefixedText ) ) {
 531                         $s = $this->prefix( $this->mTextform );
 532                         $s = str_replace( '_', ' ', $s );
 533                         $this->mPrefixedText = $s;
 534                 }
 535                 //convert to the desired language variant
 536                 $t = $wgContLang->convert($this->mPrefixedText);
 537                 return $t;
 538         }
 539
 540         /**
 541          * Get the prefixed title with spaces, plus any fragment
 542          * (part beginning with '#')
 543          * @return string the prefixed title, with spaces and
 544          *      the fragment, including '#'
 545          * @access public
 546          */
 547         function getFullText() {
 548                 global $wgContLang;
 549                 $text = $this->getPrefixedText();
 550                 if( '' != $this->mFragment ) {
 551                         $text .= '#' . $this->mFragment;
 552                 }
 553                 //convert to desired language variant
 554                 $t = $wgContLang->convert($text);
 555                 return $t;
 556         }
 557
 558         /**
 559          * Get a URL-encoded title (not an actual URL) including interwiki
 560          * @return string the URL-encoded form
 561          * @access public
 562          */
 563         function getPrefixedURL() {
 564                 $s = $this->prefix( $this->mDbkeyform );
 565                 $s = str_replace( ' ', '_', $s );
 566
 567                 $s = wfUrlencode ( $s ) ;
 568
 569                 # Cleaning up URL to make it look nice -- is this safe?
 570                 $s = preg_replace( '/%3[Aa]/', ':', $s );
 571                 $s = preg_replace( '/%2[Ff]/', '/', $s );
 572                 $s = str_replace( '%28', '(', $s );
 573                 $s = str_replace( '%29', ')', $s );
 574
 575                 return $s;
 576         }
 577
 578         /**
 579          * Get a real URL referring to this title, with interwiki link and
 580          * fragment
 581          *
 582          * @param string $query an optional query string, not used
 583          *      for interwiki links
 584          * @return string the URL
 585          * @access public
 586          */
 587         function getFullURL( $query = '' ) {
 588                 global $wgContLang, $wgArticlePath, $wgServer, $wgScript;
 589
 590                 if ( '' == $this->mInterwiki ) {
 591                         $p = $wgArticlePath;
 592                         return $wgServer . $this->getLocalUrl( $query );
 593                 } else {
 594                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 595                         $namespace = $wgContLang->getNsText( $this->mNamespace );
 596                         if ( '' != $namespace ) {
 597                                 # Can this actually happen? Interwikis shouldn't be parsed.
 598                                 $namepace .= ':';
 599                         }
 600                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 601                         if ( '' != $this->mFragment ) {
 602                                 $url .= '#' . $this->mFragment;
 603                         }
 604                         return $url;
 605                 }
 606         }
 607
 608         /**
 609          * @deprecated
 610          */
 611         function getURL() {
 612                 die( 'Call to obsolete obsolete function Title::getURL()' );
 613         }
 614
 615         /**
 616          * Get a URL with no fragment or server name
 617          * @param string $query an optional query string; if not specified,
 618          *      $wgArticlePath will be used.
 619          * @return string the URL
 620          * @access public
 621          */
 622         function getLocalURL( $query = '' ) {
 623                 global $wgLang, $wgArticlePath, $wgScript;
 624
 625                 if ( $this->isExternal() ) {
 626                         return $this->getFullURL();
 627                 }
 628
 629                 $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 630                 if ( $query == '' ) {
 631                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 632                 } else {
 633                         if ( $query == '-' ) {
 634                                 $query = '';
 635                         }
 636                         if ( $wgScript != '' ) {
 637                                 $url = "{$wgScript}?title={$dbkey}&{$query}";
 638                         } else {
 639                                 # Top level wiki
 640                                 $url = "/{$dbkey}?{$query}";
 641                         }
 642                 }
 643                 return $url;
 644         }
 645
 646         /**
 647          * Get an HTML-escaped version of the URL form, suitable for
 648          * using in a link, without a server name or fragment
 649          * @param string $query an optional query string
 650          * @return string the URL
 651          * @access public
 652          */
 653         function escapeLocalURL( $query = '' ) {
 654                 return htmlspecialchars( $this->getLocalURL( $query ) );
 655         }
 656
 657         /**
 658          * Get an HTML-escaped version of the URL form, suitable for
 659          * using in a link, including the server name and fragment
 660          *
 661          * @return string the URL
 662          * @param string $query an optional query string
 663          * @access public
 664          */
 665         function escapeFullURL( $query = '' ) {
 666                 return htmlspecialchars( $this->getFullURL( $query ) );
 667         }
 668
 669         /**
 670          * Get the URL form for an internal link.
 671          * - Used in various Squid-related code, in case we have a different
 672          * internal hostname for the server from the exposed one.
 673          *
 674          * @param string $query an optional query string
 675          * @return string the URL
 676          * @access public
 677          */
 678         function getInternalURL( $query = '' ) {
 679                 global $wgInternalServer;
 680                 return $wgInternalServer . $this->getLocalURL( $query );
 681         }
 682
 683         /**
 684          * Get the edit URL for this Title
 685          * @return string the URL, or a null string if this is an
 686          *      interwiki link
 687          * @access public
 688          */
 689         function getEditURL() {
 690                 global $wgServer, $wgScript;
 691
 692                 if ( '' != $this->mInterwiki ) { return ''; }
 693                 $s = $this->getLocalURL( 'action=edit' );
 694
 695                 return $s;
 696         }
 697
 698         /**
 699          * Get the HTML-escaped displayable text form.
 700          * Used for the title field in <a> tags.
 701          * @return string the text, including any prefixes
 702          * @access public
 703          */
 704         function getEscapedText() {
 705                 return htmlspecialchars( $this->getPrefixedText() );
 706         }
 707
 708         /**
 709          * Is this Title interwiki?
 710          * @return boolean
 711          * @access public
 712          */
 713         function isExternal() { return ( '' != $this->mInterwiki ); }
 714
 715         /**
 716          * Does the title correspond to a protected article?
 717          * @return boolean
 718          * @access public
 719          */
 720         function isProtected() {
 721                 if ( -1 == $this->mNamespace ) { return true; }
 722                 $a = $this->getRestrictions();
 723                 if ( in_array( 'sysop', $a ) ) { return true; }
 724                 return false;
 725         }
 726
 727         /**
 728          * Is the page a log page, i.e. one where the history is messed up by
 729          * LogPage.php? This used to be used for suppressing diff links in
 730          * recent changes, but now that's done by setting a flag in the
 731          * recentchanges table. Hence, this probably is no longer used.
 732          *
 733          * @deprecated
 734          * @access public
 735          */
 736         function isLog() {
 737                 if ( $this->mNamespace != Namespace::getWikipedia() ) {
 738                         return false;
 739                 }
 740                 if ( ( 0 == strcmp( wfMsg( 'uploadlogpage' ), $this->mDbkeyform ) ) ||
 741                   ( 0 == strcmp( wfMsg( 'dellogpage' ), $this->mDbkeyform ) ) ) {
 742                         return true;
 743                 }
 744                 return false;
 745         }
 746
 747         /**
 748          * Is $wgUser is watching this page?
 749          * @return boolean
 750          * @access public
 751          */
 752         function userIsWatching() {
 753                 global $wgUser;
 754
 755                 if ( -1 == $this->mNamespace ) { return false; }
 756                 if ( 0 == $wgUser->getID() ) { return false; }
 757
 758                 return $wgUser->isWatched( $this );
 759         }
 760
 761         /**
 762          * Can $wgUser edit this page?
 763          * @return boolean
 764          * @access public
 765          */
 766         function userCanEdit() {
 767                 global $wgUser;
 768                 if ( -1 == $this->mNamespace ) { return false; }
 769                 if ( NS_MEDIAWIKI == $this->mNamespace && !$wgUser->isSysop() ) { return false; }
 770                 # if ( 0 == $this->getArticleID() ) { return false; }
 771                 if ( $this->mDbkeyform == '_' ) { return false; }
 772                 # protect global styles and js
 773                 if ( NS_MEDIAWIKI == $this->mNamespace
 774                      && preg_match("/\\.(css|js)$/", $this->mTextform )
 775                      && !$wgUser->isSysop() )
 776                 { return false; }
 777                 //if ( $this->isCssJsSubpage() and !$this->userCanEditCssJsSubpage() ) { return false; }
 778                 # protect css/js subpages of user pages
 779                 # XXX: this might be better using restrictions
 780                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
 781                 if( Namespace::getUser() == $this->mNamespace
 782                         and preg_match("/\\.(css|js)$/", $this->mTextform )
 783                         and !$wgUser->isSysop()
 784                         and !preg_match('/^'.preg_quote($wgUser->getName(), '/').'/', $this->mTextform) )
 785                 { return false; }
 786                 $ur = $wgUser->getRights();
 787                 foreach ( $this->getRestrictions() as $r ) {
 788                         if ( '' != $r && ( ! in_array( $r, $ur ) ) ) {
 789                                 return false;
 790                         }
 791                 }
 792                 return true;
 793         }
 794
 795         /**
 796          * Can $wgUser read this page?
 797          * @return boolean
 798          * @access public
 799          */
 800         function userCanRead() {
 801                 global $wgUser;
 802                 global $wgWhitelistRead;
 803
 804                 if( 0 != $wgUser->getID() ) return true;
 805                 if( !is_array( $wgWhitelistRead ) ) return true;
 806
 807                 $name = $this->getPrefixedText();
 808                 if( in_array( $name, $wgWhitelistRead ) ) return true;
 809
 810                 # Compatibility with old settings
 811                 if( $this->getNamespace() == NS_MAIN ) {
 812                         if( in_array( ':' . $name, $wgWhitelistRead ) ) return true;
 813                 }
 814                 return false;
 815         }
 816
 817         /**
 818          * Is this a .css or .js subpage of a user page?
 819          * @return bool
 820          * @access public
 821          */
 822         function isCssJsSubpage() {
 823                 return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
 824         }
 825         /**
 826          * Is this a .css subpage of a user page?
 827          * @return bool
 828          * @access public
 829          */
 830         function isCssSubpage() {
 831                 return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
 832         }
 833         /**
 834          * Is this a .js subpage of a user page?
 835          * @return bool
 836          * @access public
 837          */
 838         function isJsSubpage() {
 839                 return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
 840         }
 841         /**
 842          * Protect css/js subpages of user pages: can $wgUser edit
 843          * this page?
 844          *
 845          * @return boolean
 846          * @todo XXX: this might be better using restrictions
 847          * @access public
 848          */
 849         function userCanEditCssJsSubpage() {
 850                 global $wgUser;
 851                 return ( $wgUser->isSysop() or preg_match('/^'.preg_quote($wgUser->getName()).'/', $this->mTextform) );
 852         }
 853
 854         /**
 855          * Accessor/initialisation for mRestrictions
 856          * @return array the array of groups allowed to edit this article
 857          * @access public
 858          */
 859         function getRestrictions() {
 860                 $id = $this->getArticleID();
 861                 if ( 0 == $id ) { return array(); }
 862
 863                 if ( ! $this->mRestrictionsLoaded ) {
 864                         $dbr =& wfGetDB( DB_SLAVE );
 865                         $res = $dbr->getField( 'cur', 'cur_restrictions', 'cur_id='.$id );
 866                         $this->mRestrictions = explode( ',', trim( $res ) );
 867                         $this->mRestrictionsLoaded = true;
 868                 }
 869                 return $this->mRestrictions;
 870         }
 871
 872         /**
 873          * Is there a version of this page in the deletion archive?
 874          * @return int the number of archived revisions
 875          * @access public
 876          */
 877         function isDeleted() {
 878                 $fname = 'Title::isDeleted';
 879                 $dbr =& wfGetDB( DB_SLAVE );
 880                 $n = $dbr->getField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
 881                         'ar_title' => $this->getDBkey() ), $fname );
 882                 return (int)$n;
 883         }
 884
 885         /**
 886          * Get the article ID for this Title from the link cache,
 887          * adding it if necessary
 888          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
 889          *      for update
 890          * @return int the ID
 891          * @access public
 892          */
 893         function getArticleID( $flags = 0 ) {
 894                 global $wgLinkCache;
 895
 896                 if ( $flags & GAID_FOR_UPDATE ) {
 897                         $oldUpdate = $wgLinkCache->forUpdate( true );
 898                         $this->mArticleID = $wgLinkCache->addLinkObj( $this );
 899                         $wgLinkCache->forUpdate( $oldUpdate );
 900                 } else {
 901                         if ( -1 == $this->mArticleID ) {
 902                                 $this->mArticleID = $wgLinkCache->addLinkObj( $this );
 903                         }
 904                 }
 905                 return $this->mArticleID;
 906         }
 907
 908         /**
 909          * This clears some fields in this object, and clears any associated
 910          * keys in the "bad links" section of $wgLinkCache.
 911          *
 912          * - This is called from Article::insertNewArticle() to allow
 913          * loading of the new cur_id. It's also called from
 914          * Article::doDeleteArticle()
 915          *
 916          * @param int $newid the new Article ID
 917          * @access public
 918          */
 919         function resetArticleID( $newid ) {
 920                 global $wgLinkCache;
 921                 $wgLinkCache->clearBadLink( $this->getPrefixedDBkey() );
 922
 923                 if ( 0 == $newid ) { $this->mArticleID = -1; }
 924                 else { $this->mArticleID = $newid; }
 925                 $this->mRestrictionsLoaded = false;
 926                 $this->mRestrictions = array();
 927         }
 928
 929         /**
 930          * Updates cur_touched for this page; called from LinksUpdate.php
 931          * @return bool true if the update succeded
 932          * @access public
 933          */
 934         function invalidateCache() {
 935                 $now = wfTimestampNow();
 936                 $dbw =& wfGetDB( DB_MASTER );
 937                 $success = $dbw->updateArray( 'cur',
 938                         array( /* SET */
 939                                 'cur_touched' => $dbw->timestamp()
 940                         ), array( /* WHERE */
 941                                 'cur_namespace' => $this->getNamespace() ,
 942                                 'cur_title' => $this->getDBkey()
 943                         ), 'Title::invalidateCache'
 944                 );
 945                 return $success;
 946         }
 947
 948         /**
 949          * Prefix some arbitrary text with the namespace or interwiki prefix
 950          * of this object
 951          *
 952          * @param string $name the text
 953          * @return string the prefixed text
 954          * @access private
 955          */
 956         /* private */ function prefix( $name ) {
 957                 global $wgContLang;
 958
 959                 $p = '';
 960                 if ( '' != $this->mInterwiki ) {
 961                         $p = $this->mInterwiki . ':';
 962                 }
 963                 if ( 0 != $this->mNamespace ) {
 964                         $p .= $wgContLang->getNsText( $this->mNamespace ) . ':';
 965                 }
 966                 return $p . $name;
 967         }
 968
 969         /**
 970          * Secure and split - main initialisation function for this object
 971          *
 972          * Assumes that mDbkeyform has been set, and is urldecoded
 973          * and uses underscores, but not otherwise munged.  This function
 974          * removes illegal characters, splits off the interwiki and
 975          * namespace prefixes, sets the other forms, and canonicalizes
 976          * everything.
 977          * @return bool true on success
 978          * @access private
 979          */
 980         /* private */ function secureAndSplit()
 981         {
 982                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
 983                 $fname = 'Title::secureAndSplit';
 984                 wfProfileIn( $fname );
 985
 986                 static $imgpre = false;
 987                 static $rxTc = false;
 988
 989                 # Initialisation
 990                 if ( $imgpre === false ) {
 991                         $imgpre = ':' . $wgContLang->getNsText( Namespace::getImage() ) . ':';
 992                         # % is needed as well
 993                         $rxTc = '/[^' . Title::legalChars() . ']/';
 994                 }
 995
 996                 $this->mInterwiki = $this->mFragment = '';
 997                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
 998
 999                 # Clean up whitespace
1000                 #
1001                 $t = preg_replace( "/[\\s_]+/", '_', $this->mDbkeyform );
1002                 $t = preg_replace( '/^_*(.*?)_*$/', '$1', $t );
1003
1004                 if ( '' == $t ) {
1005                         wfProfileOut( $fname );
1006                         return false;
1007                 }
1008
1009                 global $wgUseLatin1;
1010                 if( !$wgUseLatin1 &&  false !== strpos( $t, UTF8_REPLACEMENT ) ) {
1011                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1012                         wfProfileOut( $fname );
1013                         return false;
1014                 }
1015
1016                 $this->mDbkeyform = $t;
1017                 $done = false;
1018
1019                 # :Image: namespace
1020                 if ( 0 == strncasecmp( $imgpre, $t, strlen( $imgpre ) ) ) {
1021                         $t = substr( $t, 1 );
1022                 }
1023
1024                 # Initial colon indicating main namespace
1025                 if ( ':' == $t{0} ) {
1026                         $r = substr( $t, 1 );
1027                         $this->mNamespace = NS_MAIN;
1028                 } else {
1029                         # Namespace or interwiki prefix
1030                         if ( preg_match( "/^(.+?)_*:_*(.*)$/", $t, $m ) ) {
1031                                 #$p = strtolower( $m[1] );
1032                                 $p = $m[1];
1033                                 $lowerNs = strtolower( $p );
1034                                 if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1035                                         # Canonical namespace
1036                                         $t = $m[2];
1037                                         $this->mNamespace = $ns;
1038                                 } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1039                                         # Ordinary namespace
1040                                         $t = $m[2];
1041                                         $this->mNamespace = $ns;
1042                                 } elseif ( $this->getInterwikiLink( $p ) ) {
1043                                         # Interwiki link
1044                                         $t = $m[2];
1045                                         $this->mInterwiki = $p;
1046
1047                                         if ( !preg_match( "/^([A-Za-z0-9_\\x80-\\xff]+):(.*)$/", $t, $m ) ) {
1048                                                 $done = true;
1049                                         } elseif($this->mInterwiki != $wgLocalInterwiki) {
1050                                                 $done = true;
1051                                         }
1052                                 }
1053                         }
1054                         $r = $t;
1055                 }
1056
1057                 # Redundant interwiki prefix to the local wiki
1058                 if ( 0 == strcmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1059                         $this->mInterwiki = '';
1060                 }
1061                 # We already know that some pages won't be in the database!
1062                 #
1063                 if ( '' != $this->mInterwiki || -1 == $this->mNamespace ) {
1064                         $this->mArticleID = 0;
1065                 }
1066                 $f = strstr( $r, '#' );
1067                 if ( false !== $f ) {
1068                         $this->mFragment = substr( $f, 1 );
1069                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
1070                         # remove whitespace again: prevents "Foo_bar_#"
1071                         # becoming "Foo_bar_"
1072                         $r = preg_replace( '/_*$/', '', $r );
1073                 }
1074
1075                 # Reject illegal characters.
1076                 #
1077                 if( preg_match( $rxTc, $r ) ) {
1078                         wfProfileOut( $fname );
1079                         return false;
1080                 }
1081
1082                 # "." and ".." conflict with the directories of those namesa
1083                 if ( strpos( $r, '.' ) !== false &&
1084                      ( $r === '.' || $r === '..' ||
1085                        strpos( $r, './' ) === 0  ||
1086                        strpos( $r, '../' ) === 0 ||
1087                        strpos( $r, '/./' ) !== false ||
1088                        strpos( $r, '/../' ) !== false ) )
1089                 {
1090                         wfProfileOut( $fname );
1091                         return false;
1092                 }
1093
1094                 # Initial capital letter
1095                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1096                         $t = $wgContLang->ucfirst( $r );
1097                 } else {
1098                         $t = $r;
1099                 }
1100
1101                 # Fill fields
1102                 $this->mDbkeyform = $t;
1103                 $this->mUrlform = wfUrlencode( $t );
1104
1105                 $this->mTextform = str_replace( '_', ' ', $t );
1106
1107                 wfProfileOut( $fname );
1108                 return true;
1109         }
1110
1111         /**
1112          * Get a Title object associated with the talk page of this article
1113          * @return Title the object for the talk page
1114          * @access public
1115          */
1116         function getTalkPage() {
1117                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1118         }
1119
1120         /**
1121          * Get a title object associated with the subject page of this
1122          * talk page
1123          *
1124          * @return Title the object for the subject page
1125          * @access public
1126          */
1127         function getSubjectPage() {
1128                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1129         }
1130
1131         /**
1132          * Get an array of Title objects linking to this Title
1133          * - Also stores the IDs in the link cache.
1134          *
1135          * @param string $options may be FOR UPDATE
1136          * @return array the Title objects linking here
1137          * @access public
1138          */
1139         function getLinksTo( $options = '' ) {
1140                 global $wgLinkCache;
1141                 $id = $this->getArticleID();
1142
1143                 if ( $options ) {
1144                         $db =& wfGetDB( DB_MASTER );
1145                 } else {
1146                         $db =& wfGetDB( DB_SLAVE );
1147                 }
1148                 $cur = $db->tableName( 'cur' );
1149                 $links = $db->tableName( 'links' );
1150
1151                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM $cur,$links WHERE l_from=cur_id AND l_to={$id} $options";
1152                 $res = $db->query( $sql, 'Title::getLinksTo' );
1153                 $retVal = array();
1154                 if ( $db->numRows( $res ) ) {
1155                         while ( $row = $db->fetchObject( $res ) ) {
1156                                 if ( $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title ) ) {
1157                                         $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
1158                                         $retVal[] = $titleObj;
1159                                 }
1160                         }
1161                 }
1162                 $db->freeResult( $res );
1163                 return $retVal;
1164         }
1165
1166         /**
1167          * Get an array of Title objects linking to this non-existent title.
1168          * - Also stores the IDs in the link cache.
1169          *
1170          * @param string $options may be FOR UPDATE
1171          * @return array the Title objects linking here
1172          * @access public
1173          */
1174         function getBrokenLinksTo( $options = '' ) {
1175                 global $wgLinkCache;
1176
1177                 if ( $options ) {
1178                         $db =& wfGetDB( DB_MASTER );
1179                 } else {
1180                         $db =& wfGetDB( DB_SLAVE );
1181                 }
1182                 $cur = $db->tableName( 'cur' );
1183                 $brokenlinks = $db->tableName( 'brokenlinks' );
1184                 $encTitle = $db->strencode( $this->getPrefixedDBkey() );
1185
1186                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM $brokenlinks,$cur " .
1187                   "WHERE bl_from=cur_id AND bl_to='$encTitle' $options";
1188                 $res = $db->query( $sql, "Title::getBrokenLinksTo" );
1189                 $retVal = array();
1190                 if ( $db->numRows( $res ) ) {
1191                         while ( $row = $db->fetchObject( $res ) ) {
1192                                 $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title );
1193                                 $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
1194                                 $retVal[] = $titleObj;
1195                         }
1196                 }
1197                 $db->freeResult( $res );
1198                 return $retVal;
1199         }
1200
1201         /**
1202          * Get a list of URLs to purge from the Squid cache when this
1203          * page changes
1204          *
1205          * @return array the URLs
1206          * @access public
1207          */
1208         function getSquidURLs() {
1209                 return array(
1210                         $this->getInternalURL(),
1211                         $this->getInternalURL( 'action=history' )
1212                 );
1213         }
1214
1215         /**
1216          * Move this page without authentication
1217          * @param Title &$nt the new page Title
1218          * @access public
1219          */
1220         function moveNoAuth( &$nt ) {
1221                 return $this->moveTo( $nt, false );
1222         }
1223
1224         /**
1225          * Move a title to a new location
1226          * @param Title &$nt the new title
1227          * @param bool $auth indicates whether $wgUser's permissions
1228          *      should be checked
1229          * @return mixed true on success, message name on failure
1230          * @access public
1231          */
1232         function moveTo( &$nt, $auth = true ) {
1233                 if( !$this or !$nt ) {
1234                         return 'badtitletext';
1235                 }
1236
1237                 $fname = 'Title::move';
1238                 $oldid = $this->getArticleID();
1239                 $newid = $nt->getArticleID();
1240
1241                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1242                         return 'articleexists';
1243                 }
1244                 if ( ( ! Namespace::isMovable( $this->getNamespace() ) ) ||
1245                          ( '' == $this->getDBkey() ) ||
1246                          ( '' != $this->getInterwiki() ) ||
1247                          ( !$oldid ) ||
1248                      ( ! Namespace::isMovable( $nt->getNamespace() ) ) ||
1249                          ( '' == $nt->getDBkey() ) ||
1250                          ( '' != $nt->getInterwiki() ) ) {
1251                         return 'badarticleerror';
1252                 }
1253
1254                 if ( $auth && ( !$this->userCanEdit() || !$nt->userCanEdit() ) ) {
1255                         return 'protectedpage';
1256                 }
1257
1258                 # The move is allowed only if (1) the target doesn't exist, or
1259                 # (2) the target is a redirect to the source, and has no history
1260                 # (so we can undo bad moves right after they're done).
1261
1262                 if ( 0 != $newid ) { # Target exists; check for validity
1263                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1264                                 return 'articleexists';
1265                         }
1266                         $this->moveOverExistingRedirect( $nt );
1267                 } else { # Target didn't exist, do normal move.
1268                         $this->moveToNewTitle( $nt, $newid );
1269                 }
1270
1271                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
1272
1273                 $dbw =& wfGetDB( DB_MASTER );
1274                 $sql = "UPDATE categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
1275                         " WHERE cl_from=" . $dbw->addQuotes( $this->getArticleID() ) .
1276                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
1277                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
1278
1279                 # Update watchlists
1280
1281                 $oldnamespace = $this->getNamespace() & ~1;
1282                 $newnamespace = $nt->getNamespace() & ~1;
1283                 $oldtitle = $this->getDBkey();
1284                 $newtitle = $nt->getDBkey();
1285
1286                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
1287                         WatchedItem::duplicateEntries( $this, $nt );
1288                 }
1289
1290                 # Update search engine
1291                 $u = new SearchUpdate( $oldid, $nt->getPrefixedDBkey() );
1292                 $u->doUpdate();
1293                 $u = new SearchUpdate( $newid, $this->getPrefixedDBkey(), '' );
1294                 $u->doUpdate();
1295
1296                 return true;
1297         }
1298
1299         /**
1300          * Move page to a title which is at present a redirect to the
1301          * source page
1302          *
1303          * @param Title &$nt the page to move to, which should currently
1304          *      be a redirect
1305          * @access private
1306          */
1307         /* private */ function moveOverExistingRedirect( &$nt ) {
1308                 global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
1309                 $fname = 'Title::moveOverExistingRedirect';
1310                 $comment = wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1311
1312                 $now = wfTimestampNow();
1313                 $won = wfInvertTimestamp( $now );
1314                 $newid = $nt->getArticleID();
1315                 $oldid = $this->getArticleID();
1316                 $dbw =& wfGetDB( DB_MASTER );
1317                 $links = $dbw->tableName( 'links' );
1318
1319                 # Change the name of the target page:
1320                 $dbw->updateArray( 'cur',
1321                         /* SET */ array(
1322                                 'cur_touched' => $dbw->timestamp($now),
1323                                 'cur_namespace' => $nt->getNamespace(),
1324                                 'cur_title' => $nt->getDBkey()
1325                         ),
1326                         /* WHERE */ array( 'cur_id' => $oldid ),
1327                         $fname
1328                 );
1329                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1330
1331                 # Repurpose the old redirect. We don't save it to history since
1332                 # by definition if we've got here it's rather uninteresting.
1333
1334                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1335                 $dbw->updateArray( 'cur',
1336                         /* SET */ array(
1337                                 'cur_touched' => $dbw->timestamp($now),
1338                                 'cur_timestamp' => $dbw->timestamp($now),
1339                                 'inverse_timestamp' => $won,
1340                                 'cur_namespace' => $this->getNamespace(),
1341                                 'cur_title' => $this->getDBkey(),
1342                                 'cur_text' => $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n",
1343                                 'cur_comment' => $comment,
1344                                 'cur_user' => $wgUser->getID(),
1345                                 'cur_minor_edit' => 0,
1346                                 'cur_counter' => 0,
1347                                 'cur_restrictions' => '',
1348                                 'cur_user_text' => $wgUser->getName(),
1349                                 'cur_is_redirect' => 1,
1350                                 'cur_is_new' => 1
1351                         ),
1352                         /* WHERE */ array( 'cur_id' => $newid ),
1353                         $fname
1354                 );
1355
1356                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1357
1358                 # Fix the redundant names for the past revisions of the target page.
1359                 # The redirect should have no old revisions.
1360                 $dbw->updateArray(
1361                         /* table */ 'old',
1362                         /* SET */ array(
1363                                 'old_namespace' => $nt->getNamespace(),
1364                                 'old_title' => $nt->getDBkey(),
1365                         ),
1366                         /* WHERE */ array(
1367                                 'old_namespace' => $this->getNamespace(),
1368                                 'old_title' => $this->getDBkey(),
1369                         ),
1370                         $fname
1371                 );
1372
1373                 RecentChange::notifyMoveOverRedirect( $now, $this, $nt, $wgUser, $comment );
1374
1375                 # Swap links
1376
1377                 # Load titles and IDs
1378                 $linksToOld = $this->getLinksTo( 'FOR UPDATE' );
1379                 $linksToNew = $nt->getLinksTo( 'FOR UPDATE' );
1380
1381                 # Delete them all
1382                 $sql = "DELETE FROM $links WHERE l_to=$oldid OR l_to=$newid";
1383                 $dbw->query( $sql, $fname );
1384
1385                 # Reinsert
1386                 if ( count( $linksToOld ) || count( $linksToNew )) {
1387                         $sql = "INSERT INTO $links (l_from,l_to) VALUES ";
1388                         $first = true;
1389
1390                         # Insert links to old title
1391                         foreach ( $linksToOld as $linkTitle ) {
1392                                 if ( $first ) {
1393                                         $first = false;
1394                                 } else {
1395                                         $sql .= ',';
1396                                 }
1397                                 $id = $linkTitle->getArticleID();
1398                                 $sql .= "($id,$newid)";
1399                         }
1400
1401                         # Insert links to new title
1402                         foreach ( $linksToNew as $linkTitle ) {
1403                                 if ( $first ) {
1404                                         $first = false;
1405                                 } else {
1406                                         $sql .= ',';
1407                                 }
1408                                 $id = $linkTitle->getArticleID();
1409                                 $sql .= "($id, $oldid)";
1410                         }
1411
1412                         $dbw->query( $sql, DB_MASTER, $fname );
1413                 }
1414
1415                 # Now, we record the link from the redirect to the new title.
1416                 # It should have no other outgoing links...
1417                 $dbw->delete( 'links', array( 'l_from' => $newid ) );
1418                 $dbw->insertArray( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ) );
1419
1420                 # Clear linkscc
1421                 LinkCache::linksccClearLinksTo( $oldid );
1422                 LinkCache::linksccClearLinksTo( $newid );
1423
1424                 # Purge squid
1425                 if ( $wgUseSquid ) {
1426                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1427                         $u = new SquidUpdate( $urls );
1428                         $u->doUpdate();
1429                 }
1430         }
1431
1432         /**
1433          * Move page to non-existing title.
1434          * @param Title &$nt the new Title
1435          * @param int &$newid set to be the new article ID
1436          * @access private
1437          */
1438         /* private */ function moveToNewTitle( &$nt, &$newid ) {
1439                 global $wgUser, $wgLinkCache, $wgUseSquid;
1440                 $fname = 'MovePageForm::moveToNewTitle';
1441                 $comment = wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1442
1443                 $newid = $nt->getArticleID();
1444                 $oldid = $this->getArticleID();
1445                 $dbw =& wfGetDB( DB_MASTER );
1446                 $now = $dbw->timestamp();
1447                 $won = wfInvertTimestamp( wfTimestamp(TS_MW,$now) );
1448                 wfSeedRandom();
1449                 $rand = number_format( mt_rand() / mt_getrandmax(), 12, '.', '' );
1450
1451                 # Rename cur entry
1452                 $dbw->updateArray( 'cur',
1453                         /* SET */ array(
1454                                 'cur_touched' => $now,
1455                                 'cur_namespace' => $nt->getNamespace(),
1456                                 'cur_title' => $nt->getDBkey()
1457                         ),
1458                         /* WHERE */ array( 'cur_id' => $oldid ),
1459                         $fname
1460                 );
1461
1462                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1463
1464                 # Insert redirect
1465                 $dbw->insertArray( 'cur', array(
1466                         'cur_id' => $dbw->nextSequenceValue('cur_cur_id_seq'),
1467                         'cur_namespace' => $this->getNamespace(),
1468                         'cur_title' => $this->getDBkey(),
1469                         'cur_comment' => $comment,
1470                         'cur_user' => $wgUser->getID(),
1471                         'cur_user_text' => $wgUser->getName(),
1472                         'cur_timestamp' => $now,
1473                         'inverse_timestamp' => $won,
1474                         'cur_touched' => $now,
1475                         'cur_is_redirect' => 1,
1476                         'cur_random' => $rand,
1477                         'cur_is_new' => 1,
1478                         'cur_text' => "#REDIRECT [[" . $nt->getPrefixedText() . "]]\n" ), $fname
1479                 );
1480                 $newid = $dbw->insertId();
1481                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1482
1483                 # Rename old entries
1484                 $dbw->updateArray(
1485                         /* table */ 'old',
1486                         /* SET */ array(
1487                                 'old_namespace' => $nt->getNamespace(),
1488                                 'old_title' => $nt->getDBkey()
1489                         ),
1490                         /* WHERE */ array(
1491                                 'old_namespace' => $this->getNamespace(),
1492                                 'old_title' => $this->getDBkey()
1493                         ), $fname
1494                 );
1495
1496                 # Record in RC
1497                 RecentChange::notifyMoveToNew( $now, $this, $nt, $wgUser, $comment );
1498
1499                 # Purge squid and linkscc as per article creation
1500                 Article::onArticleCreate( $nt );
1501
1502                 # Any text links to the old title must be reassigned to the redirect
1503                 $dbw->updateArray( 'links', array( 'l_to' => $newid ), array( 'l_to' => $oldid ), $fname );
1504                 LinkCache::linksccClearLinksTo( $oldid );
1505
1506                 # Record the just-created redirect's linking to the page
1507                 $dbw->insertArray( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ), $fname );
1508
1509                 # Non-existent target may have had broken links to it; these must
1510                 # now be removed and made into good links.
1511                 $update = new LinksUpdate( $oldid, $nt->getPrefixedDBkey() );
1512                 $update->fixBrokenLinks();
1513
1514                 # Purge old title from squid
1515                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1516                 $titles = $nt->getLinksTo();
1517                 if ( $wgUseSquid ) {
1518                         $urls = $this->getSquidURLs();
1519                         foreach ( $titles as $linkTitle ) {
1520                                 $urls[] = $linkTitle->getInternalURL();
1521                         }
1522                         $u = new SquidUpdate( $urls );
1523                         $u->doUpdate();
1524                 }
1525         }
1526
1527         /**
1528          * Checks if $this can be moved to a given Title
1529          * - Selects for update, so don't call it unless you mean business
1530          *
1531          * @param Title &$nt the new title to check
1532          * @access public
1533          */
1534         function isValidMoveTarget( $nt ) {
1535                 $fname = 'Title::isValidMoveTarget';
1536                 $dbw =& wfGetDB( DB_MASTER );
1537
1538                 # Is it a redirect?
1539                 $id  = $nt->getArticleID();
1540                 $obj = $dbw->getArray( 'cur', array( 'cur_is_redirect','cur_text' ),
1541                         array( 'cur_id' => $id ), $fname, 'FOR UPDATE' );
1542
1543                 if ( !$obj || 0 == $obj->cur_is_redirect ) {
1544                         # Not a redirect
1545                         return false;
1546                 }
1547
1548                 # Does the redirect point to the source?
1549                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $obj->cur_text, $m ) ) {
1550                         $redirTitle = Title::newFromText( $m[1] );
1551                         if( !is_object( $redirTitle ) ||
1552                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1553                                 return false;
1554                         }
1555                 }
1556
1557                 # Does the article have a history?
1558                 $row = $dbw->getArray( 'old', array( 'old_id' ),
1559                         array(
1560                                 'old_namespace' => $nt->getNamespace(),
1561                                 'old_title' => $nt->getDBkey()
1562                         ), $fname, 'FOR UPDATE'
1563                 );
1564
1565                 # Return true if there was no history
1566                 return $row === false;
1567         }
1568
1569         /**
1570          * Create a redirect; fails if the title already exists; does
1571          * not notify RC
1572          *
1573          * @param Title $dest the destination of the redirect
1574          * @param string $comment the comment string describing the move
1575          * @return bool true on success
1576          * @access public
1577          */
1578         function createRedirect( $dest, $comment ) {
1579                 global $wgUser;
1580                 if ( $this->getArticleID() ) {
1581                         return false;
1582                 }
1583
1584                 $fname = 'Title::createRedirect';
1585                 $dbw =& wfGetDB( DB_MASTER );
1586                 $now = wfTimestampNow();
1587                 $won = wfInvertTimestamp( $now );
1588                 $seqVal = $dbw->nextSequenceValue( 'cur_cur_id_seq' );
1589
1590                 $dbw->insertArray( 'cur', array(
1591                         'cur_id' => $seqVal,
1592                         'cur_namespace' => $this->getNamespace(),
1593                         'cur_title' => $this->getDBkey(),
1594                         'cur_comment' => $comment,
1595                         'cur_user' => $wgUser->getID(),
1596                         'cur_user_text' => $wgUser->getName(),
1597                         'cur_timestamp' => $now,
1598                         'inverse_timestamp' => $won,
1599                         'cur_touched' => $now,
1600                         'cur_is_redirect' => 1,
1601                         'cur_is_new' => 1,
1602                         'cur_text' => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n"
1603                 ), $fname );
1604                 $newid = $dbw->insertId();
1605                 $this->resetArticleID( $newid );
1606
1607                 # Link table
1608                 if ( $dest->getArticleID() ) {
1609                         $dbw->insertArray( 'links',
1610                                 array(
1611                                         'l_to' => $dest->getArticleID(),
1612                                         'l_from' => $newid
1613                                 ), $fname
1614                         );
1615                 } else {
1616                         $dbw->insertArray( 'brokenlinks',
1617                                 array(
1618                                         'bl_to' => $dest->getPrefixedDBkey(),
1619                                         'bl_from' => $newid
1620                                 ), $fname
1621                         );
1622                 }
1623
1624                 Article::onArticleCreate( $this );
1625                 return true;
1626         }
1627
1628         /**
1629          * Get categories to which this Title belongs and return an array of
1630          * categories' names.
1631          *
1632          * @return array an array of parents in the form:
1633          *      $parent => $currentarticle
1634          * @access public
1635          */
1636         function getParentCategories() {
1637                 global $wgContLang,$wgUser;
1638
1639                 $titlekey = $this->getArticleId();
1640                 $sk =& $wgUser->getSkin();
1641                 $parents = array();
1642                 $dbr =& wfGetDB( DB_SLAVE );
1643                 $cur = $dbr->tableName( 'cur' );
1644                 $categorylinks = $dbr->tableName( 'categorylinks' );
1645
1646                 # NEW SQL
1647                 $sql = "SELECT * FROM categorylinks"
1648                      ." WHERE cl_from='$titlekey'"
1649                          ." AND cl_from <> '0'"
1650                          ." ORDER BY cl_sortkey";
1651
1652                 $res = $dbr->query ( $sql ) ;
1653
1654                 if($dbr->numRows($res) > 0) {
1655                         while ( $x = $dbr->fetchObject ( $res ) )
1656                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
1657                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
1658                         $dbr->freeResult ( $res ) ;
1659                 } else {
1660                         $data = '';
1661                 }
1662                 return $data;
1663         }
1664
1665         /**
1666          * Go through all parent categories of this Title
1667          * @return array
1668          * @access public
1669          */
1670         function getCategorieBrowser() {
1671                 $parents = $this->getParentCategories();
1672
1673                 if($parents != '') {
1674                         foreach($parents as $parent => $current)
1675                         {
1676                                 $nt = Title::newFromText($parent);
1677                                 $stack[$parent] = $nt->getCategorieBrowser();
1678                         }
1679                         return $stack;
1680                 } else {
1681                         return array();
1682                 }
1683         }
1684
1685
1686         /**
1687          * Get an associative array for selecting this title from
1688          * the "cur" table
1689          *
1690          * @return array
1691          * @access public
1692          */
1693         function curCond() {
1694                 return array( 'cur_namespace' => $this->mNamespace, 'cur_title' => $this->mDbkeyform );
1695         }
1696
1697         /**
1698          * Get an associative array for selecting this title from the
1699          * "old" table
1700          *
1701          * @return array
1702          * @access public
1703          */
1704         function oldCond() {
1705                 return array( 'old_namespace' => $this->mNamespace, 'old_title' => $this->mDbkeyform );
1706         }
1707
1708         /**
1709          * Get the revision ID of the previous revision
1710          *
1711          * @param integer $revision  Revision ID. Get the revision that was before this one.
1712          * @return interger $oldrevision|false
1713          */
1714         function getPreviousRevisionID( $revision ) {
1715                 $dbr =& wfGetDB( DB_SLAVE );
1716                 return $dbr->selectField( 'old', 'old_id',
1717                         'old_title=' . $dbr->addQuotes( $this->getDBkey() ) .
1718                         ' AND old_namespace=' . IntVal( $this->getNamespace() ) .
1719                         ' AND old_id<' . IntVal( $revision ) . ' ORDER BY old_id DESC' );
1720         }
1721
1722         /**
1723          * Get the revision ID of the next revision
1724          *
1725          * @param integer $revision  Revision ID. Get the revision that was after this one.
1726          * @return interger $oldrevision|false
1727          */
1728         function getNextRevisionID( $revision ) {
1729                 $dbr =& wfGetDB( DB_SLAVE );
1730                 return $dbr->selectField( 'old', 'old_id',
1731                         'old_title=' . $dbr->addQuotes( $this->getDBkey() ) .
1732                         ' AND old_namespace=' . IntVal( $this->getNamespace() ) .
1733                         ' AND old_id>' . IntVal( $revision ) . ' ORDER BY old_id' );
1734         }
1735
1736 }
1737 ?>