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                 /**
  98                  * Wiki pages often contain multiple links to the same page.
  99                  * Title normalization and parsing can become expensive on
 100                  * pages with many links, so we can save a little time by
 101                  * caching them.
 102                  *
 103                  * In theory these are value objects and won't get changed...
 104                  */
 105                 static $titleCache = array();
 106                 if( $defaultNamespace == 0 && isset( $titleCache[$text] ) ) {
 107                         wfProfileOut( $fname );
 108                         return $titleCache[$text];
 109                 }
 110
 111                 /**
 112                  * Convert things like &eacute; into real text...
 113                  */
 114                 global $wgInputEncoding;
 115                 $filteredText = do_html_entity_decode( $text, ENT_COMPAT, $wgInputEncoding );
 116
 117                 /**
 118                  * Convert things like &#257; or &#x3017; into real text...
 119                  * WARNING: Not friendly to internal links on a latin-1 wiki.
 120                  */
 121                 $filteredText = wfMungeToUtf8( $filteredText );
 122
 123                 # What was this for? TS 2004-03-03
 124                 # $text = urldecode( $text );
 125
 126                 $t =& new Title();
 127                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 128                 $t->mDefaultNamespace = $defaultNamespace;
 129
 130                 if( $t->secureAndSplit() ) {
 131                         if( $defaultNamespace == 0 ) {
 132                                 $titleCache[$text] =& $t;
 133                         }
 134                         wfProfileOut( $fname );
 135                         return $t;
 136                 } else {
 137                         wfProfileOut( $fname );
 138                         return NULL;
 139                 }
 140         }
 141
 142         /**
 143          * Create a new Title from URL-encoded text. Ensures that
 144          * the given title's length does not exceed the maximum.
 145          * @param string $url the title, as might be taken from a URL
 146          * @return Title the new object, or NULL on an error
 147          * @static
 148          * @access public
 149          */
 150         /* static */ function newFromURL( $url ) {
 151                 global $wgLang, $wgServer;
 152                 $t = new Title();
 153
 154                 # For compatibility with old buggy URLs. "+" is not valid in titles,
 155                 # but some URLs used it as a space replacement and they still come
 156                 # from some external search tools.
 157                 $s = str_replace( '+', ' ', $url );
 158
 159                 $t->mDbkeyform = str_replace( ' ', '_', $s );
 160                 if( $t->secureAndSplit() ) {
 161                         return $t;
 162                 } else {
 163                         return NULL;
 164                 }
 165         }
 166
 167         /**
 168          * Create a new Title from an article ID
 169          * @todo This is inefficiently implemented, the cur row is requested
 170          * but not used for anything else
 171          * @param int $id the cur_id corresponding to the Title to create
 172          * @return Title the new object, or NULL on an error
 173          * @access public
 174          */
 175         /* static */ function newFromID( $id ) {
 176                 $fname = 'Title::newFromID';
 177                 $dbr =& wfGetDB( DB_SLAVE );
 178                 $row = $dbr->selectRow( 'cur', array( 'cur_namespace', 'cur_title' ),
 179                         array( 'cur_id' => $id ), $fname );
 180                 if ( $row !== false ) {
 181                         $title = Title::makeTitle( $row->cur_namespace, $row->cur_title );
 182                 } else {
 183                         $title = NULL;
 184                 }
 185                 return $title;
 186         }
 187
 188         /**
 189          * Create a new Title from a namespace index and a DB key.
 190          * It's assumed that $ns and $title are *valid*, for instance when
 191          * they came directly from the database or a special page name.
 192          * For convenience, spaces are converted to underscores so that
 193          * eg user_text fields can be used directly.
 194          *
 195          * @param int $ns the namespace of the article
 196          * @param string $title the unprefixed database key form
 197          * @return Title the new object
 198          * @static
 199          * @access public
 200          */
 201         /* static */ function &makeTitle( $ns, $title ) {
 202                 $t =& new Title();
 203                 $t->mInterwiki = '';
 204                 $t->mFragment = '';
 205                 $t->mNamespace = IntVal( $ns );
 206                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 207                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 208                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 209                 $t->mTextform = str_replace( '_', ' ', $title );
 210                 return $t;
 211         }
 212
 213         /**
 214          * Create a new Title frrom a namespace index and a DB key.
 215          * The parameters will be checked for validity, which is a bit slower
 216          * than makeTitle() but safer for user-provided data.
 217          * @param int $ns the namespace of the article
 218          * @param string $title the database key form
 219          * @return Title the new object, or NULL on an error
 220          * @static
 221          * @access public
 222          */
 223         /* static */ function makeTitleSafe( $ns, $title ) {
 224                 $t = new Title();
 225                 $t->mDbkeyform = Title::makeName( $ns, $title );
 226                 if( $t->secureAndSplit() ) {
 227                         return $t;
 228                 } else {
 229                         return NULL;
 230                 }
 231         }
 232
 233         /**
 234          * Create a new Title for the Main Page
 235          * @static
 236          * @return Title the new object
 237          * @access public
 238          */
 239         /* static */ function newMainPage() {
 240                 return Title::newFromText( wfMsgForContent( 'mainpage' ) );
 241         }
 242
 243         /**
 244          * Create a new Title for a redirect
 245          * @param string $text the redirect title text
 246          * @return Title the new object, or NULL if the text is not a
 247          *      valid redirect
 248          * @static
 249          * @access public
 250          */
 251         /* static */ function newFromRedirect( $text ) {
 252                 global $wgMwRedir;
 253                 $rt = NULL;
 254                 if ( $wgMwRedir->matchStart( $text ) ) {
 255                         if ( preg_match( '/\\[\\[([^\\]\\|]+)[\\]\\|]/', $text, $m ) ) {
 256                                 # categories are escaped using : for example one can enter:
 257                                 # #REDIRECT [[:Category:Music]]. Need to remove it.
 258                                 if ( substr($m[1],0,1) == ':') {
 259                                         # We don't want to keep the ':'
 260                                         $m[1] = substr( $m[1], 1 );
 261                                 }
 262
 263                                 $rt = Title::newFromText( $m[1] );
 264                                 # Disallow redirects to Special:Userlogout
 265                                 if ( !is_null($rt) && $rt->getNamespace() == NS_SPECIAL && preg_match( '/^Userlogout/i', $rt->getText() ) ) {
 266                                         $rt = NULL;
 267                                 }
 268                         }
 269                 }
 270                 return $rt;
 271         }
 272
 273 #----------------------------------------------------------------------------
 274 #       Static functions
 275 #----------------------------------------------------------------------------
 276
 277         /**
 278          * Get the prefixed DB key associated with an ID
 279          * @param int $id the cur_id of the article
 280          * @return Title an object representing the article, or NULL
 281          *      if no such article was found
 282          * @static
 283          * @access public
 284          */
 285         /* static */ function nameOf( $id ) {
 286                 $fname = 'Title::nameOf';
 287                 $dbr =& wfGetDB( DB_SLAVE );
 288
 289                 $s = $dbr->selectRow( 'cur', array( 'cur_namespace','cur_title' ),  array( 'cur_id' => $id ), $fname );
 290                 if ( $s === false ) { return NULL; }
 291
 292                 $n = Title::makeName( $s->cur_namespace, $s->cur_title );
 293                 return $n;
 294         }
 295
 296         /**
 297          * Get a regex character class describing the legal characters in a link
 298          * @return string the list of characters, not delimited
 299          * @static
 300          * @access public
 301          */
 302         /* static */ function legalChars() {
 303                 # Missing characters:
 304                 #  * []|# Needed for link syntax
 305                 #  * % and + are corrupted by Apache when they appear in the path
 306                 #
 307                 # % seems to work though
 308                 #
 309                 # The problem with % is that URLs are double-unescaped: once by Apache's
 310                 # path conversion code, and again by PHP. So %253F, for example, becomes "?".
 311                 # Our code does not double-escape to compensate for this, indeed double escaping
 312                 # would break if the double-escaped title was passed in the query string
 313                 # rather than the path. This is a minor security issue because articles can be
 314                 # created such that they are hard to view or edit. -- TS
 315                 #
 316                 # Theoretically 0x80-0x9F of ISO 8859-1 should be disallowed, but
 317                 # this breaks interlanguage links
 318
 319                 $set = " %!\"$&'()*,\\-.\\/0-9:;=?@A-Z\\\\^_`a-z~\\x80-\\xFF";
 320                 return $set;
 321         }
 322
 323         /**
 324          * Get a string representation of a title suitable for
 325          * including in a search index
 326          *
 327          * @param int $ns a namespace index
 328          * @param string $title text-form main part
 329          * @return string a stripped-down title string ready for the
 330          *      search index
 331          */
 332         /* static */ function indexTitle( $ns, $title ) {
 333                 global $wgDBminWordLen, $wgContLang;
 334                 require_once( 'SearchEngine.php' );
 335
 336                 $lc = SearchEngine::legalSearchChars() . '&#;';
 337                 $t = $wgContLang->stripForSearch( $title );
 338                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 339                 $t = strtolower( $t );
 340
 341                 # Handle 's, s'
 342                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 343                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 344
 345                 $t = preg_replace( "/\\s+/", ' ', $t );
 346
 347                 if ( $ns == NS_IMAGE ) {
 348                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 349                 }
 350                 return trim( $t );
 351         }
 352
 353         /*
 354          * Make a prefixed DB key from a DB key and a namespace index
 355          * @param int $ns numerical representation of the namespace
 356          * @param string $title the DB key form the title
 357          * @return string the prefixed form of the title
 358          */
 359         /* static */ function makeName( $ns, $title ) {
 360                 global $wgContLang;
 361
 362                 $n = $wgContLang->getNsText( $ns );
 363                 if ( '' == $n ) { return $title; }
 364                 else { return $n.':'.$title; }
 365         }
 366
 367         /**
 368          * Returns the URL associated with an interwiki prefix
 369          * @param string $key the interwiki prefix (e.g. "MeatBall")
 370          * @return the associated URL, containing "$1", which should be
 371          *      replaced by an article title
 372          * @static (arguably)
 373          * @access public
 374          */
 375         function getInterwikiLink( $key ) {
 376                 global $wgMemc, $wgDBname, $wgInterwikiExpiry, $wgTitleInterwikiCache;
 377                 $fname = 'Title::getInterwikiLink';
 378
 379                 wfProfileIn( $fname );
 380
 381                 $k = $wgDBname.':interwiki:'.$key;
 382                 if( array_key_exists( $k, $wgTitleInterwikiCache ) ) {
 383                         wfProfileOut( $fname );
 384                         return $wgTitleInterwikiCache[$k]->iw_url;
 385                 }
 386
 387                 $s = $wgMemc->get( $k );
 388                 # Ignore old keys with no iw_local
 389                 if( $s && isset( $s->iw_local ) ) {
 390                         $wgTitleInterwikiCache[$k] = $s;
 391                         wfProfileOut( $fname );
 392                         return $s->iw_url;
 393                 }
 394
 395                 $dbr =& wfGetDB( DB_SLAVE );
 396                 $res = $dbr->select( 'interwiki',
 397                         array( 'iw_url', 'iw_local' ),
 398                         array( 'iw_prefix' => $key ), $fname );
 399                 if( !$res ) {
 400                         wfProfileOut( $fname );
 401                         return '';
 402                 }
 403
 404                 $s = $dbr->fetchObject( $res );
 405                 if( !$s ) {
 406                         # Cache non-existence: create a blank object and save it to memcached
 407                         $s = (object)false;
 408                         $s->iw_url = '';
 409                         $s->iw_local = 0;
 410                 }
 411                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 412                 $wgTitleInterwikiCache[$k] = $s;
 413
 414                 wfProfileOut( $fname );
 415                 return $s->iw_url;
 416         }
 417
 418         /**
 419          * Determine whether the object refers to a page within
 420          * this project.
 421          *
 422          * @return bool TRUE if this is an in-project interwiki link
 423          *      or a wikilink, FALSE otherwise
 424          * @access public
 425          */
 426         function isLocal() {
 427                 global $wgTitleInterwikiCache, $wgDBname;
 428
 429                 if ( $this->mInterwiki != '' ) {
 430                         # Make sure key is loaded into cache
 431                         $this->getInterwikiLink( $this->mInterwiki );
 432                         $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 433                         return (bool)($wgTitleInterwikiCache[$k]->iw_local);
 434                 } else {
 435                         return true;
 436                 }
 437         }
 438
 439         /**
 440          * Update the cur_touched field for an array of title objects
 441          * @todo Inefficient unless the IDs are already loaded into the
 442          *      link cache
 443          * @param array $titles an array of Title objects to be touched
 444          * @param string $timestamp the timestamp to use instead of the
 445          *      default current time
 446          * @static
 447          * @access public
 448          */
 449         /* static */ function touchArray( $titles, $timestamp = '' ) {
 450                 if ( count( $titles ) == 0 ) {
 451                         return;
 452                 }
 453                 $dbw =& wfGetDB( DB_MASTER );
 454                 if ( $timestamp == '' ) {
 455                         $timestamp = $dbw->timestamp();
 456                 }
 457                 $cur = $dbw->tableName( 'cur' );
 458                 $sql = "UPDATE $cur SET cur_touched='{$timestamp}' WHERE cur_id IN (";
 459                 $first = true;
 460
 461                 foreach ( $titles as $title ) {
 462                         if ( ! $first ) {
 463                                 $sql .= ',';
 464                         }
 465                         $first = false;
 466                         $sql .= $title->getArticleID();
 467                 }
 468                 $sql .= ')';
 469                 if ( ! $first ) {
 470                         $dbw->query( $sql, 'Title::touchArray' );
 471                 }
 472         }
 473
 474 #----------------------------------------------------------------------------
 475 #       Other stuff
 476 #----------------------------------------------------------------------------
 477
 478         /** Simple accessors */
 479         /**
 480          * Get the text form (spaces not underscores) of the main part
 481          * @return string
 482          * @access public
 483          */
 484         function getText() { return $this->mTextform; }
 485         /**
 486          * Get the URL-encoded form of the main part
 487          * @return string
 488          * @access public
 489          */
 490         function getPartialURL() { return $this->mUrlform; }
 491         /**
 492          * Get the main part with underscores
 493          * @return string
 494          * @access public
 495          */
 496         function getDBkey() { return $this->mDbkeyform; }
 497         /**
 498          * Get the namespace index, i.e. one of the NS_xxxx constants
 499          * @return int
 500          * @access public
 501          */
 502         function getNamespace() { return $this->mNamespace; }
 503         /**
 504          * Get the interwiki prefix (or null string)
 505          * @return string
 506          * @access public
 507          */
 508         function getInterwiki() { return $this->mInterwiki; }
 509         /**
 510          * Get the Title fragment (i.e. the bit after the #)
 511          * @return string
 512          * @access public
 513          */
 514         function getFragment() { return $this->mFragment; }
 515         /**
 516          * Get the default namespace index, for when there is no namespace
 517          * @return int
 518          * @access public
 519          */
 520         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 521
 522         /**
 523          * Get title for search index
 524          * @return string a stripped-down title string ready for the
 525          *      search index
 526          */
 527         function getIndexTitle() {
 528                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 529         }
 530
 531         /**
 532          * Get the prefixed database key form
 533          * @return string the prefixed title, with underscores and
 534          *      any interwiki and namespace prefixes
 535          * @access public
 536          */
 537         function getPrefixedDBkey() {
 538                 $s = $this->prefix( $this->mDbkeyform );
 539                 $s = str_replace( ' ', '_', $s );
 540                 return $s;
 541         }
 542
 543         /**
 544          * Get the prefixed title with spaces.
 545          * This is the form usually used for display
 546          * @return string the prefixed title, with spaces
 547          * @access public
 548          */
 549         function getPrefixedText() {
 550                 global $wgContLang;
 551                 if ( empty( $this->mPrefixedText ) ) {
 552                         $s = $this->prefix( $this->mTextform );
 553                         $s = str_replace( '_', ' ', $s );
 554                         $this->mPrefixedText = $s;
 555                 }
 556                 return $this->mPrefixedText;
 557         }
 558
 559         /**
 560          * Get the prefixed title with spaces, plus any fragment
 561          * (part beginning with '#')
 562          * @return string the prefixed title, with spaces and
 563          *      the fragment, including '#'
 564          * @access public
 565          */
 566         function getFullText() {
 567                 global $wgContLang;
 568                 $text = $this->getPrefixedText();
 569                 if( '' != $this->mFragment ) {
 570                         $text .= '#' . $this->mFragment;
 571                 }
 572                 return $text;
 573         }
 574
 575         /**
 576          * Get a URL-encoded title (not an actual URL) including interwiki
 577          * @return string the URL-encoded form
 578          * @access public
 579          */
 580         function getPrefixedURL() {
 581                 $s = $this->prefix( $this->mDbkeyform );
 582                 $s = str_replace( ' ', '_', $s );
 583
 584                 $s = wfUrlencode ( $s ) ;
 585
 586                 # Cleaning up URL to make it look nice -- is this safe?
 587                 $s = str_replace( '%28', '(', $s );
 588                 $s = str_replace( '%29', ')', $s );
 589
 590                 return $s;
 591         }
 592
 593         /**
 594          * Get a real URL referring to this title, with interwiki link and
 595          * fragment
 596          *
 597          * @param string $query an optional query string, not used
 598          *      for interwiki links
 599          * @return string the URL
 600          * @access public
 601          */
 602         function getFullURL( $query = '' ) {
 603                 global $wgContLang, $wgArticlePath, $wgServer, $wgScript;
 604
 605                 if ( '' == $this->mInterwiki ) {
 606                         $p = $wgArticlePath;
 607                         return $wgServer . $this->getLocalUrl( $query );
 608                 } else {
 609                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 610                         $namespace = $wgContLang->getNsText( $this->mNamespace );
 611                         if ( '' != $namespace ) {
 612                                 # Can this actually happen? Interwikis shouldn't be parsed.
 613                                 $namepace .= ':';
 614                         }
 615                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 616                         if ( '' != $this->mFragment ) {
 617                                 $url .= '#' . $this->mFragment;
 618                         }
 619                         return $url;
 620                 }
 621         }
 622
 623         /**
 624          * Get a URL with no fragment or server name
 625          * @param string $query an optional query string; if not specified,
 626          *      $wgArticlePath will be used.
 627          * @return string the URL
 628          * @access public
 629          */
 630         function getLocalURL( $query = '' ) {
 631                 global $wgLang, $wgArticlePath, $wgScript;
 632
 633                 if ( $this->isExternal() ) {
 634                         return $this->getFullURL();
 635                 }
 636
 637                 $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 638                 if ( $query == '' ) {
 639                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 640                 } else {
 641                         if ( $query == '-' ) {
 642                                 $query = '';
 643                         }
 644                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 645                 }
 646                 return $url;
 647         }
 648
 649         /**
 650          * Get an HTML-escaped version of the URL form, suitable for
 651          * using in a link, without a server name or fragment
 652          * @param string $query an optional query string
 653          * @return string the URL
 654          * @access public
 655          */
 656         function escapeLocalURL( $query = '' ) {
 657                 return htmlspecialchars( $this->getLocalURL( $query ) );
 658         }
 659
 660         /**
 661          * Get an HTML-escaped version of the URL form, suitable for
 662          * using in a link, including the server name and fragment
 663          *
 664          * @return string the URL
 665          * @param string $query an optional query string
 666          * @access public
 667          */
 668         function escapeFullURL( $query = '' ) {
 669                 return htmlspecialchars( $this->getFullURL( $query ) );
 670         }
 671
 672         /**
 673          * Get the URL form for an internal link.
 674          * - Used in various Squid-related code, in case we have a different
 675          * internal hostname for the server from the exposed one.
 676          *
 677          * @param string $query an optional query string
 678          * @return string the URL
 679          * @access public
 680          */
 681         function getInternalURL( $query = '' ) {
 682                 global $wgInternalServer;
 683                 return $wgInternalServer . $this->getLocalURL( $query );
 684         }
 685
 686         /**
 687          * Get the edit URL for this Title
 688          * @return string the URL, or a null string if this is an
 689          *      interwiki link
 690          * @access public
 691          */
 692         function getEditURL() {
 693                 global $wgServer, $wgScript;
 694
 695                 if ( '' != $this->mInterwiki ) { return ''; }
 696                 $s = $this->getLocalURL( 'action=edit' );
 697
 698                 return $s;
 699         }
 700
 701         /**
 702          * Get the HTML-escaped displayable text form.
 703          * Used for the title field in <a> tags.
 704          * @return string the text, including any prefixes
 705          * @access public
 706          */
 707         function getEscapedText() {
 708                 return htmlspecialchars( $this->getPrefixedText() );
 709         }
 710
 711         /**
 712          * Is this Title interwiki?
 713          * @return boolean
 714          * @access public
 715          */
 716         function isExternal() { return ( '' != $this->mInterwiki ); }
 717
 718         /**
 719          * Does the title correspond to a protected article?
 720          * @param string $what the action the page is protected from,
 721          *      by default checks move and edit
 722          * @return boolean
 723          * @access public
 724          */
 725         function isProtected($action = '') {
 726                 if ( -1 == $this->mNamespace ) { return true; }
 727                 if($action == 'edit' || $action == '') {
 728                         $a = $this->getRestrictions("edit");
 729                         if ( in_array( 'sysop', $a ) ) { return true; }
 730                 }
 731                 if($action == 'move' || $action == '') {
 732                         $a = $this->getRestrictions("move");
 733                         if ( in_array( 'sysop', $a ) ) { return true; }
 734                 }
 735                 return false;
 736         }
 737
 738         /**
 739          * Is $wgUser is watching this page?
 740          * @return boolean
 741          * @access public
 742          */
 743         function userIsWatching() {
 744                 global $wgUser;
 745
 746                 if ( -1 == $this->mNamespace ) { return false; }
 747                 if ( 0 == $wgUser->getID() ) { return false; }
 748
 749                 return $wgUser->isWatched( $this );
 750         }
 751
 752         /**
 753          * Is $wgUser perform $action this page?
 754          * @param string $action action that permission needs to be checked for
 755          * @return boolean
 756          * @access private
 757          */
 758         function userCan($action) {
 759                 $fname = 'Title::userCanEdit';
 760                 wfProfileIn( $fname );
 761
 762                 global $wgUser;
 763                 if( NS_SPECIAL == $this->mNamespace ) {
 764                         wfProfileOut( $fname );
 765                         return false;
 766                 }
 767                 if( NS_MEDIAWIKI == $this->mNamespace &&
 768                     !$wgUser->isAllowed('editinterface') ) {
 769                         wfProfileOut( $fname );
 770                         return false;
 771                 }
 772                 if( $this->mDbkeyform == '_' ) {
 773                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
 774                         wfProfileOut( $fname );
 775                         return false;
 776                 }
 777
 778                 # protect global styles and js
 779                 if ( NS_MEDIAWIKI == $this->mNamespace
 780                  && preg_match("/\\.(css|js)$/", $this->mTextform )
 781                      && !$wgUser->isAllowed('editinterface') ) {
 782                         wfProfileOut( $fname );
 783                         return false;
 784                 }
 785
 786                 # protect css/js subpages of user pages
 787                 # XXX: this might be better using restrictions
 788                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
 789                 if( NS_USER == $this->mNamespace
 790                         && preg_match("/\\.(css|js)$/", $this->mTextform )
 791                         && !$wgUser->isAllowed('editinterface')
 792                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
 793                         wfProfileOut( $fname );
 794                         return false;
 795                 }
 796
 797                 foreach( $this->getRestrictions($action) as $right ) {
 798                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
 799                                 wfProfileOut( $fname );
 800                                 return false;
 801                         }
 802                 }
 803                 wfProfileOut( $fname );
 804                 return true;
 805         }
 806
 807         /**
 808          * Can $wgUser edit this page?
 809          * @return boolean
 810          * @access public
 811          */
 812         function userCanEdit() {
 813                 return $this->userCan('edit');
 814         }
 815
 816         /**
 817          * Can $wgUser move this page?
 818          * @return boolean
 819          * @access public
 820          */
 821         function userCanMove() {
 822                 return $this->userCan('move');
 823         }
 824
 825         /**
 826          * Can $wgUser read this page?
 827          * @return boolean
 828          * @access public
 829          */
 830         function userCanRead() {
 831                 global $wgUser;
 832
 833                 if( $wgUser->isAllowed('read') ) {
 834                         return true;
 835                 } else {
 836                         global $wgWhitelistRead;
 837
 838                         /** If anon users can create an account,
 839                             they need to reach the login page first! */
 840                         if( $wgUser->isAllowed( 'createaccount' )
 841                             && $this->mId == NS_SPECIAL
 842                             && $this->getText() == 'Userlogin' ) {
 843                                 return true;
 844                         }
 845
 846                         /** some pages are explicitly allowed */
 847                         $name = $this->getPrefixedText();
 848                         if( in_array( $name, $wgWhitelistRead ) ) {
 849                                 return true;
 850                         }
 851
 852                         # Compatibility with old settings
 853                         if( $this->getNamespace() == NS_MAIN ) {
 854                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
 855                                         return true;
 856                                 }
 857                         }
 858                 }
 859                 return false;
 860         }
 861
 862         /**
 863          * Is this a .css or .js subpage of a user page?
 864          * @return bool
 865          * @access public
 866          */
 867         function isCssJsSubpage() {
 868                 return ( NS_USER == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
 869         }
 870         /**
 871          * Is this a .css subpage of a user page?
 872          * @return bool
 873          * @access public
 874          */
 875         function isCssSubpage() {
 876                 return ( NS_USER == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
 877         }
 878         /**
 879          * Is this a .js subpage of a user page?
 880          * @return bool
 881          * @access public
 882          */
 883         function isJsSubpage() {
 884                 return ( NS_USER == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
 885         }
 886         /**
 887          * Protect css/js subpages of user pages: can $wgUser edit
 888          * this page?
 889          *
 890          * @return boolean
 891          * @todo XXX: this might be better using restrictions
 892          * @access public
 893          */
 894         function userCanEditCssJsSubpage() {
 895                 global $wgUser;
 896                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
 897         }
 898
 899         /**
 900          * Loads a string into mRestrictions array
 901          * @param string $res restrictions in string format
 902          * @access public
 903          */
 904         function loadRestrictions( $res ) {
 905                 foreach( explode( ':', trim( $res ) ) as $restrict ) {
 906                         $temp = explode( '=', trim( $restrict ) );
 907                         if(count($temp) == 1) {
 908                                 // old format should be treated as edit/move restriction
 909                                 $this->mRestrictions["edit"] = explode( ',', trim( $temp[0] ) );
 910                                 $this->mRestrictions["move"] = explode( ',', trim( $temp[0] ) );
 911                         } else {
 912                                 $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
 913                         }
 914                 }
 915                 $this->mRestrictionsLoaded = true;
 916         }
 917
 918         /**
 919          * Accessor/initialisation for mRestrictions
 920          * @param string $action action that permission needs to be checked for
 921          * @return array the array of groups allowed to edit this article
 922          * @access public
 923          */
 924         function getRestrictions($action) {
 925                 $id = $this->getArticleID();
 926                 if ( 0 == $id ) { return array(); }
 927
 928                 if ( ! $this->mRestrictionsLoaded ) {
 929                         $dbr =& wfGetDB( DB_SLAVE );
 930                         $res = $dbr->selectField( 'cur', 'cur_restrictions', 'cur_id='.$id );
 931                         $this->loadRestrictions( $res );
 932                 }
 933                 if( isset( $this->mRestrictions[$action] ) ) {
 934                         return $this->mRestrictions[$action];
 935                 }
 936                 return array();
 937         }
 938
 939         /**
 940          * Is there a version of this page in the deletion archive?
 941          * @return int the number of archived revisions
 942          * @access public
 943          */
 944         function isDeleted() {
 945                 $fname = 'Title::isDeleted';
 946                 $dbr =& wfGetDB( DB_SLAVE );
 947                 $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
 948                         'ar_title' => $this->getDBkey() ), $fname );
 949                 return (int)$n;
 950         }
 951
 952         /**
 953          * Get the article ID for this Title from the link cache,
 954          * adding it if necessary
 955          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
 956          *      for update
 957          * @return int the ID
 958          * @access public
 959          */
 960         function getArticleID( $flags = 0 ) {
 961                 global $wgLinkCache;
 962
 963                 if ( $flags & GAID_FOR_UPDATE ) {
 964                         $oldUpdate = $wgLinkCache->forUpdate( true );
 965                         $this->mArticleID = $wgLinkCache->addLinkObj( $this );
 966                         $wgLinkCache->forUpdate( $oldUpdate );
 967                 } else {
 968                         if ( -1 == $this->mArticleID ) {
 969                                 $this->mArticleID = $wgLinkCache->addLinkObj( $this );
 970                         }
 971                 }
 972                 return $this->mArticleID;
 973         }
 974
 975         /**
 976          * This clears some fields in this object, and clears any associated
 977          * keys in the "bad links" section of $wgLinkCache.
 978          *
 979          * - This is called from Article::insertNewArticle() to allow
 980          * loading of the new cur_id. It's also called from
 981          * Article::doDeleteArticle()
 982          *
 983          * @param int $newid the new Article ID
 984          * @access public
 985          */
 986         function resetArticleID( $newid ) {
 987                 global $wgLinkCache;
 988                 $wgLinkCache->clearBadLink( $this->getPrefixedDBkey() );
 989
 990                 if ( 0 == $newid ) { $this->mArticleID = -1; }
 991                 else { $this->mArticleID = $newid; }
 992                 $this->mRestrictionsLoaded = false;
 993                 $this->mRestrictions = array();
 994         }
 995
 996         /**
 997          * Updates cur_touched for this page; called from LinksUpdate.php
 998          * @return bool true if the update succeded
 999          * @access public
1000          */
1001         function invalidateCache() {
1002                 $now = wfTimestampNow();
1003                 $dbw =& wfGetDB( DB_MASTER );
1004                 $success = $dbw->update( 'cur',
1005                         array( /* SET */
1006                                 'cur_touched' => $dbw->timestamp()
1007                         ), array( /* WHERE */
1008                                 'cur_namespace' => $this->getNamespace() ,
1009                                 'cur_title' => $this->getDBkey()
1010                         ), 'Title::invalidateCache'
1011                 );
1012                 return $success;
1013         }
1014
1015         /**
1016          * Prefix some arbitrary text with the namespace or interwiki prefix
1017          * of this object
1018          *
1019          * @param string $name the text
1020          * @return string the prefixed text
1021          * @access private
1022          */
1023         /* private */ function prefix( $name ) {
1024                 global $wgContLang;
1025
1026                 $p = '';
1027                 if ( '' != $this->mInterwiki ) {
1028                         $p = $this->mInterwiki . ':';
1029                 }
1030                 if ( 0 != $this->mNamespace ) {
1031                         $p .= $wgContLang->getNsText( $this->mNamespace ) . ':';
1032                 }
1033                 return $p . $name;
1034         }
1035
1036         /**
1037          * Secure and split - main initialisation function for this object
1038          *
1039          * Assumes that mDbkeyform has been set, and is urldecoded
1040          * and uses underscores, but not otherwise munged.  This function
1041          * removes illegal characters, splits off the interwiki and
1042          * namespace prefixes, sets the other forms, and canonicalizes
1043          * everything.
1044          * @return bool true on success
1045          * @access private
1046          */
1047         /* private */ function secureAndSplit() {
1048                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1049                 $fname = 'Title::secureAndSplit';
1050                 wfProfileIn( $fname );
1051
1052                 # Initialisation
1053                 static $rxTc = false;
1054                 if( !$rxTc ) {
1055                         # % is needed as well
1056                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/S';
1057                 }
1058
1059                 $this->mInterwiki = $this->mFragment = '';
1060                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1061
1062                 # Clean up whitespace
1063                 #
1064                 $t = preg_replace( '/[\\s_]+/', '_', $this->mDbkeyform );
1065                 $t = trim( $t, '_' );
1066
1067                 if ( '' == $t ) {
1068                         wfProfileOut( $fname );
1069                         return false;
1070                 }
1071
1072                 global $wgUseLatin1;
1073                 if( !$wgUseLatin1 && false !== strpos( $t, UTF8_REPLACEMENT ) ) {
1074                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1075                         wfProfileOut( $fname );
1076                         return false;
1077                 }
1078
1079                 $this->mDbkeyform = $t;
1080
1081                 # Initial colon indicating main namespace
1082                 if ( ':' == $t{0} ) {
1083                         $r = substr( $t, 1 );
1084                         $this->mNamespace = NS_MAIN;
1085                 } else {
1086                         # Namespace or interwiki prefix
1087                         $firstPass = true;
1088                         do {
1089                                 if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $t, $m ) ) {
1090                                         $p = $m[1];
1091                                         $lowerNs = strtolower( $p );
1092                                         if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1093                                                 # Canonical namespace
1094                                                 $t = $m[2];
1095                                                 $this->mNamespace = $ns;
1096                                         } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1097                                                 # Ordinary namespace
1098                                                 $t = $m[2];
1099                                                 $this->mNamespace = $ns;
1100                                         } elseif( $this->getInterwikiLink( $p ) ) {
1101                                                 if( !$firstPass ) {
1102                                                         # Can't make a local interwiki link to an interwiki link.
1103                                                         # That's just crazy!
1104                                                         wfProfileOut( $fname );
1105                                                         return false;
1106                                                 }
1107
1108                                                 # Interwiki link
1109                                                 $t = $m[2];
1110                                                 $this->mInterwiki = $p;
1111
1112                                                 # Redundant interwiki prefix to the local wiki
1113                                                 if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1114                                                         $this->mInterwiki = '';
1115                                                         $firstPass = false;
1116                                                         # Do another namespace split...
1117                                                         continue;
1118                                                 }
1119                                         }
1120                                         # If there's no recognized interwiki or namespace,
1121                                         # then let the colon expression be part of the title.
1122                                 }
1123                                 break;
1124                         } while( true );
1125                         $r = $t;
1126                 }
1127
1128                 # We already know that some pages won't be in the database!
1129                 #
1130                 if ( '' != $this->mInterwiki || -1 == $this->mNamespace ) {
1131                         $this->mArticleID = 0;
1132                 }
1133                 $f = strstr( $r, '#' );
1134                 if ( false !== $f ) {
1135                         $this->mFragment = substr( $f, 1 );
1136                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
1137                         # remove whitespace again: prevents "Foo_bar_#"
1138                         # becoming "Foo_bar_"
1139                         $r = preg_replace( '/_*$/', '', $r );
1140                 }
1141
1142                 # Reject illegal characters.
1143                 #
1144                 if( preg_match( $rxTc, $r ) ) {
1145                         wfProfileOut( $fname );
1146                         return false;
1147                 }
1148
1149                 /**
1150                  * Pages with "/./" or "/../" appearing in the URLs will
1151                  * often be unreachable due to the way web browsers deal
1152                  * with 'relative' URLs. Forbid them explicitly.
1153                  */
1154                 if ( strpos( $r, '.' ) !== false &&
1155                      ( $r === '.' || $r === '..' ||
1156                        strpos( $r, './' ) === 0  ||
1157                        strpos( $r, '../' ) === 0 ||
1158                        strpos( $r, '/./' ) !== false ||
1159                        strpos( $r, '/../' ) !== false ) )
1160                 {
1161                         wfProfileOut( $fname );
1162                         return false;
1163                 }
1164
1165                 # We shouldn't need to query the DB for the size.
1166                 #$maxSize = $dbr->textFieldSize( 'cur', 'cur_title' );
1167                 if ( strlen( $r ) > 255 ) {
1168                         return false;
1169                 }
1170
1171                 /**
1172                  * Normally, all wiki links are forced to have
1173                  * an initial capital letter so [[foo]] and [[Foo]]
1174                  * point to the same place.
1175                  *
1176                  * Don't force it for interwikis, since the other
1177                  * site might be case-sensitive.
1178                  */
1179                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1180                         $t = $wgContLang->ucfirst( $r );
1181                 } else {
1182                         $t = $r;
1183                 }
1184
1185                 # Fill fields
1186                 $this->mDbkeyform = $t;
1187                 $this->mUrlform = wfUrlencode( $t );
1188
1189                 $this->mTextform = str_replace( '_', ' ', $t );
1190
1191                 wfProfileOut( $fname );
1192                 return true;
1193         }
1194
1195         /**
1196          * Get a Title object associated with the talk page of this article
1197          * @return Title the object for the talk page
1198          * @access public
1199          */
1200         function getTalkPage() {
1201                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1202         }
1203
1204         /**
1205          * Get a title object associated with the subject page of this
1206          * talk page
1207          *
1208          * @return Title the object for the subject page
1209          * @access public
1210          */
1211         function getSubjectPage() {
1212                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1213         }
1214
1215         /**
1216          * Get an array of Title objects linking to this Title
1217          * - Also stores the IDs in the link cache.
1218          *
1219          * @param string $options may be FOR UPDATE
1220          * @return array the Title objects linking here
1221          * @access public
1222          */
1223         function getLinksTo( $options = '' ) {
1224                 global $wgLinkCache;
1225                 $id = $this->getArticleID();
1226
1227                 if ( $options ) {
1228                         $db =& wfGetDB( DB_MASTER );
1229                 } else {
1230                         $db =& wfGetDB( DB_SLAVE );
1231                 }
1232                 $cur = $db->tableName( 'cur' );
1233                 $links = $db->tableName( 'links' );
1234
1235                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM $cur,$links WHERE l_from=cur_id AND l_to={$id} $options";
1236                 $res = $db->query( $sql, 'Title::getLinksTo' );
1237                 $retVal = array();
1238                 if ( $db->numRows( $res ) ) {
1239                         while ( $row = $db->fetchObject( $res ) ) {
1240                                 if ( $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title ) ) {
1241                                         $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
1242                                         $retVal[] = $titleObj;
1243                                 }
1244                         }
1245                 }
1246                 $db->freeResult( $res );
1247                 return $retVal;
1248         }
1249
1250         /**
1251          * Get an array of Title objects linking to this non-existent title.
1252          * - Also stores the IDs in the link cache.
1253          *
1254          * @param string $options may be FOR UPDATE
1255          * @return array the Title objects linking here
1256          * @access public
1257          */
1258         function getBrokenLinksTo( $options = '' ) {
1259                 global $wgLinkCache;
1260
1261                 if ( $options ) {
1262                         $db =& wfGetDB( DB_MASTER );
1263                 } else {
1264                         $db =& wfGetDB( DB_SLAVE );
1265                 }
1266                 $cur = $db->tableName( 'cur' );
1267                 $brokenlinks = $db->tableName( 'brokenlinks' );
1268                 $encTitle = $db->strencode( $this->getPrefixedDBkey() );
1269
1270                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM $brokenlinks,$cur " .
1271                   "WHERE bl_from=cur_id AND bl_to='$encTitle' $options";
1272                 $res = $db->query( $sql, "Title::getBrokenLinksTo" );
1273                 $retVal = array();
1274                 if ( $db->numRows( $res ) ) {
1275                         while ( $row = $db->fetchObject( $res ) ) {
1276                                 $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title );
1277                                 $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
1278                                 $retVal[] = $titleObj;
1279                         }
1280                 }
1281                 $db->freeResult( $res );
1282                 return $retVal;
1283         }
1284
1285         /**
1286          * Get a list of URLs to purge from the Squid cache when this
1287          * page changes
1288          *
1289          * @return array the URLs
1290          * @access public
1291          */
1292         function getSquidURLs() {
1293                 return array(
1294                         $this->getInternalURL(),
1295                         $this->getInternalURL( 'action=history' )
1296                 );
1297         }
1298
1299         /**
1300          * Move this page without authentication
1301          * @param Title &$nt the new page Title
1302          * @access public
1303          */
1304         function moveNoAuth( &$nt ) {
1305                 return $this->moveTo( $nt, false );
1306         }
1307
1308         /**
1309          * Move a title to a new location
1310          * @param Title &$nt the new title
1311          * @param bool $auth indicates whether $wgUser's permissions
1312          *      should be checked
1313          * @return mixed true on success, message name on failure
1314          * @access public
1315          */
1316         function moveTo( &$nt, $auth = true ) {
1317                 if( !$this or !$nt ) {
1318                         return 'badtitletext';
1319                 }
1320
1321                 $fname = 'Title::move';
1322                 $oldid = $this->getArticleID();
1323                 $newid = $nt->getArticleID();
1324
1325                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1326                         return 'articleexists';
1327                 }
1328                 if ( ( ! Namespace::isMovable( $this->getNamespace() ) ) ||
1329                          ( '' == $this->getDBkey() ) ||
1330                          ( '' != $this->getInterwiki() ) ||
1331                          ( !$oldid ) ||
1332                      ( ! Namespace::isMovable( $nt->getNamespace() ) ) ||
1333                          ( '' == $nt->getDBkey() ) ||
1334                          ( '' != $nt->getInterwiki() ) ) {
1335                         return 'badarticleerror';
1336                 }
1337
1338                 if ( $auth && ( !$this->userCanEdit() || !$nt->userCanEdit() ) ) {
1339                         return 'protectedpage';
1340                 }
1341
1342                 # The move is allowed only if (1) the target doesn't exist, or
1343                 # (2) the target is a redirect to the source, and has no history
1344                 # (so we can undo bad moves right after they're done).
1345
1346                 if ( 0 != $newid ) { # Target exists; check for validity
1347                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1348                                 return 'articleexists';
1349                         }
1350                         $this->moveOverExistingRedirect( $nt );
1351                 } else { # Target didn't exist, do normal move.
1352                         $this->moveToNewTitle( $nt, $newid );
1353                 }
1354
1355                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
1356
1357                 $dbw =& wfGetDB( DB_MASTER );
1358                 $sql = "UPDATE categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
1359                         " WHERE cl_from=" . $dbw->addQuotes( $this->getArticleID() ) .
1360                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
1361                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
1362
1363                 # Update watchlists
1364
1365                 $oldnamespace = $this->getNamespace() & ~1;
1366                 $newnamespace = $nt->getNamespace() & ~1;
1367                 $oldtitle = $this->getDBkey();
1368                 $newtitle = $nt->getDBkey();
1369
1370                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
1371                         WatchedItem::duplicateEntries( $this, $nt );
1372                 }
1373
1374                 # Update search engine
1375                 $u = new SearchUpdate( $oldid, $nt->getPrefixedDBkey() );
1376                 $u->doUpdate();
1377                 $u = new SearchUpdate( $newid, $this->getPrefixedDBkey(), '' );
1378                 $u->doUpdate();
1379
1380                 return true;
1381         }
1382
1383         /**
1384          * Move page to a title which is at present a redirect to the
1385          * source page
1386          *
1387          * @param Title &$nt the page to move to, which should currently
1388          *      be a redirect
1389          * @access private
1390          */
1391         /* private */ function moveOverExistingRedirect( &$nt ) {
1392                 global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
1393                 $fname = 'Title::moveOverExistingRedirect';
1394                 $comment = wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1395
1396                 $now = wfTimestampNow();
1397                 $won = wfInvertTimestamp( $now );
1398                 $newid = $nt->getArticleID();
1399                 $oldid = $this->getArticleID();
1400                 $dbw =& wfGetDB( DB_MASTER );
1401                 $links = $dbw->tableName( 'links' );
1402
1403                 # Change the name of the target page:
1404                 $dbw->update( 'cur',
1405                         /* SET */ array(
1406                                 'cur_touched' => $dbw->timestamp($now),
1407                                 'cur_namespace' => $nt->getNamespace(),
1408                                 'cur_title' => $nt->getDBkey()
1409                         ),
1410                         /* WHERE */ array( 'cur_id' => $oldid ),
1411                         $fname
1412                 );
1413                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1414
1415                 # Repurpose the old redirect. We don't save it to history since
1416                 # by definition if we've got here it's rather uninteresting.
1417
1418                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1419                 $dbw->update( 'cur',
1420                         /* SET */ array(
1421                                 'cur_touched' => $dbw->timestamp($now),
1422                                 'cur_timestamp' => $dbw->timestamp($now),
1423                                 'inverse_timestamp' => $won,
1424                                 'cur_namespace' => $this->getNamespace(),
1425                                 'cur_title' => $this->getDBkey(),
1426                                 'cur_text' => $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n",
1427                                 'cur_comment' => $comment,
1428                                 'cur_user' => $wgUser->getID(),
1429                                 'cur_minor_edit' => 0,
1430                                 'cur_counter' => 0,
1431                                 'cur_restrictions' => '',
1432                                 'cur_user_text' => $wgUser->getName(),
1433                                 'cur_is_redirect' => 1,
1434                                 'cur_is_new' => 1
1435                         ),
1436                         /* WHERE */ array( 'cur_id' => $newid ),
1437                         $fname
1438                 );
1439
1440                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1441
1442                 # Fix the redundant names for the past revisions of the target page.
1443                 # The redirect should have no old revisions.
1444                 $dbw->update(
1445                         /* table */ 'old',
1446                         /* SET */ array(
1447                                 'old_namespace' => $nt->getNamespace(),
1448                                 'old_title' => $nt->getDBkey(),
1449                         ),
1450                         /* WHERE */ array(
1451                                 'old_namespace' => $this->getNamespace(),
1452                                 'old_title' => $this->getDBkey(),
1453                         ),
1454                         $fname
1455                 );
1456
1457                 RecentChange::notifyMoveOverRedirect( $now, $this, $nt, $wgUser, $comment );
1458
1459                 # Swap links
1460
1461                 # Load titles and IDs
1462                 $linksToOld = $this->getLinksTo( 'FOR UPDATE' );
1463                 $linksToNew = $nt->getLinksTo( 'FOR UPDATE' );
1464
1465                 # Delete them all
1466                 $sql = "DELETE FROM $links WHERE l_to=$oldid OR l_to=$newid";
1467                 $dbw->query( $sql, $fname );
1468
1469                 # Reinsert
1470                 if ( count( $linksToOld ) || count( $linksToNew )) {
1471                         $sql = "INSERT INTO $links (l_from,l_to) VALUES ";
1472                         $first = true;
1473
1474                         # Insert links to old title
1475                         foreach ( $linksToOld as $linkTitle ) {
1476                                 if ( $first ) {
1477                                         $first = false;
1478                                 } else {
1479                                         $sql .= ',';
1480                                 }
1481                                 $id = $linkTitle->getArticleID();
1482                                 $sql .= "($id,$newid)";
1483                         }
1484
1485                         # Insert links to new title
1486                         foreach ( $linksToNew as $linkTitle ) {
1487                                 if ( $first ) {
1488                                         $first = false;
1489                                 } else {
1490                                         $sql .= ',';
1491                                 }
1492                                 $id = $linkTitle->getArticleID();
1493                                 $sql .= "($id, $oldid)";
1494                         }
1495
1496                         $dbw->query( $sql, DB_MASTER, $fname );
1497                 }
1498
1499                 # Now, we record the link from the redirect to the new title.
1500                 # It should have no other outgoing links...
1501                 $dbw->delete( 'links', array( 'l_from' => $newid ) );
1502                 $dbw->insert( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ) );
1503
1504                 # Clear linkscc
1505                 LinkCache::linksccClearLinksTo( $oldid );
1506                 LinkCache::linksccClearLinksTo( $newid );
1507
1508                 # Purge squid
1509                 if ( $wgUseSquid ) {
1510                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1511                         $u = new SquidUpdate( $urls );
1512                         $u->doUpdate();
1513                 }
1514         }
1515
1516         /**
1517          * Move page to non-existing title.
1518          * @param Title &$nt the new Title
1519          * @param int &$newid set to be the new article ID
1520          * @access private
1521          */
1522         /* private */ function moveToNewTitle( &$nt, &$newid ) {
1523                 global $wgUser, $wgLinkCache, $wgUseSquid;
1524                 $fname = 'MovePageForm::moveToNewTitle';
1525                 $comment = wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1526
1527                 $newid = $nt->getArticleID();
1528                 $oldid = $this->getArticleID();
1529                 $dbw =& wfGetDB( DB_MASTER );
1530                 $now = $dbw->timestamp();
1531                 $won = wfInvertTimestamp( wfTimestamp(TS_MW,$now) );
1532                 wfSeedRandom();
1533                 $rand = wfRandom();
1534
1535                 # Rename cur entry
1536                 $dbw->update( 'cur',
1537                         /* SET */ array(
1538                                 'cur_touched' => $now,
1539                                 'cur_namespace' => $nt->getNamespace(),
1540                                 'cur_title' => $nt->getDBkey()
1541                         ),
1542                         /* WHERE */ array( 'cur_id' => $oldid ),
1543                         $fname
1544                 );
1545
1546                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1547
1548                 # Insert redirect
1549                 $dbw->insert( 'cur', array(
1550                         'cur_id' => $dbw->nextSequenceValue('cur_cur_id_seq'),
1551                         'cur_namespace' => $this->getNamespace(),
1552                         'cur_title' => $this->getDBkey(),
1553                         'cur_comment' => $comment,
1554                         'cur_user' => $wgUser->getID(),
1555                         'cur_user_text' => $wgUser->getName(),
1556                         'cur_timestamp' => $now,
1557                         'inverse_timestamp' => $won,
1558                         'cur_touched' => $now,
1559                         'cur_is_redirect' => 1,
1560                         'cur_random' => $rand,
1561                         'cur_is_new' => 1,
1562                         'cur_text' => "#REDIRECT [[" . $nt->getPrefixedText() . "]]\n" ), $fname
1563                 );
1564                 $newid = $dbw->insertId();
1565                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1566
1567                 # Rename old entries
1568                 $dbw->update(
1569                         /* table */ 'old',
1570                         /* SET */ array(
1571                                 'old_namespace' => $nt->getNamespace(),
1572                                 'old_title' => $nt->getDBkey()
1573                         ),
1574                         /* WHERE */ array(
1575                                 'old_namespace' => $this->getNamespace(),
1576                                 'old_title' => $this->getDBkey()
1577                         ), $fname
1578                 );
1579
1580                 # Record in RC
1581                 RecentChange::notifyMoveToNew( $now, $this, $nt, $wgUser, $comment );
1582
1583                 # Purge squid and linkscc as per article creation
1584                 Article::onArticleCreate( $nt );
1585
1586                 # Any text links to the old title must be reassigned to the redirect
1587                 $dbw->update( 'links', array( 'l_to' => $newid ), array( 'l_to' => $oldid ), $fname );
1588                 LinkCache::linksccClearLinksTo( $oldid );
1589
1590                 # Record the just-created redirect's linking to the page
1591                 $dbw->insert( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ), $fname );
1592
1593                 # Non-existent target may have had broken links to it; these must
1594                 # now be removed and made into good links.
1595                 $update = new LinksUpdate( $oldid, $nt->getPrefixedDBkey() );
1596                 $update->fixBrokenLinks();
1597
1598                 # Purge old title from squid
1599                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1600                 $titles = $nt->getLinksTo();
1601                 if ( $wgUseSquid ) {
1602                         $urls = $this->getSquidURLs();
1603                         foreach ( $titles as $linkTitle ) {
1604                                 $urls[] = $linkTitle->getInternalURL();
1605                         }
1606                         $u = new SquidUpdate( $urls );
1607                         $u->doUpdate();
1608                 }
1609         }
1610
1611         /**
1612          * Checks if $this can be moved to a given Title
1613          * - Selects for update, so don't call it unless you mean business
1614          *
1615          * @param Title &$nt the new title to check
1616          * @access public
1617          */
1618         function isValidMoveTarget( $nt ) {
1619                 $fname = 'Title::isValidMoveTarget';
1620                 $dbw =& wfGetDB( DB_MASTER );
1621
1622                 # Is it a redirect?
1623                 $id  = $nt->getArticleID();
1624                 $obj = $dbw->selectRow( 'cur', array( 'cur_is_redirect','cur_text' ),
1625                         array( 'cur_id' => $id ), $fname, 'FOR UPDATE' );
1626
1627                 if ( !$obj || 0 == $obj->cur_is_redirect ) {
1628                         # Not a redirect
1629                         return false;
1630                 }
1631
1632                 # Does the redirect point to the source?
1633                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $obj->cur_text, $m ) ) {
1634                         $redirTitle = Title::newFromText( $m[1] );
1635                         if( !is_object( $redirTitle ) ||
1636                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1637                                 return false;
1638                         }
1639                 }
1640
1641                 # Does the article have a history?
1642                 $row = $dbw->selectRow( 'old', array( 'old_id' ),
1643                         array(
1644                                 'old_namespace' => $nt->getNamespace(),
1645                                 'old_title' => $nt->getDBkey()
1646                         ), $fname, 'FOR UPDATE'
1647                 );
1648
1649                 # Return true if there was no history
1650                 return $row === false;
1651         }
1652
1653         /**
1654          * Create a redirect; fails if the title already exists; does
1655          * not notify RC
1656          *
1657          * @param Title $dest the destination of the redirect
1658          * @param string $comment the comment string describing the move
1659          * @return bool true on success
1660          * @access public
1661          */
1662         function createRedirect( $dest, $comment ) {
1663                 global $wgUser;
1664                 if ( $this->getArticleID() ) {
1665                         return false;
1666                 }
1667
1668                 $fname = 'Title::createRedirect';
1669                 $dbw =& wfGetDB( DB_MASTER );
1670                 $now = wfTimestampNow();
1671                 $won = wfInvertTimestamp( $now );
1672                 $seqVal = $dbw->nextSequenceValue( 'cur_cur_id_seq' );
1673
1674                 $dbw->insert( 'cur', array(
1675                         'cur_id' => $seqVal,
1676                         'cur_namespace' => $this->getNamespace(),
1677                         'cur_title' => $this->getDBkey(),
1678                         'cur_comment' => $comment,
1679                         'cur_user' => $wgUser->getID(),
1680                         'cur_user_text' => $wgUser->getName(),
1681                         'cur_timestamp' => $now,
1682                         'inverse_timestamp' => $won,
1683                         'cur_touched' => $now,
1684                         'cur_is_redirect' => 1,
1685                         'cur_is_new' => 1,
1686                         'cur_text' => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n"
1687                 ), $fname );
1688                 $newid = $dbw->insertId();
1689                 $this->resetArticleID( $newid );
1690
1691                 # Link table
1692                 if ( $dest->getArticleID() ) {
1693                         $dbw->insert( 'links',
1694                                 array(
1695                                         'l_to' => $dest->getArticleID(),
1696                                         'l_from' => $newid
1697                                 ), $fname
1698                         );
1699                 } else {
1700                         $dbw->insert( 'brokenlinks',
1701                                 array(
1702                                         'bl_to' => $dest->getPrefixedDBkey(),
1703                                         'bl_from' => $newid
1704                                 ), $fname
1705                         );
1706                 }
1707
1708                 Article::onArticleCreate( $this );
1709                 return true;
1710         }
1711
1712         /**
1713          * Get categories to which this Title belongs and return an array of
1714          * categories' names.
1715          *
1716          * @return array an array of parents in the form:
1717          *      $parent => $currentarticle
1718          * @access public
1719          */
1720         function getParentCategories() {
1721                 global $wgContLang,$wgUser;
1722
1723                 $titlekey = $this->getArticleId();
1724                 $sk =& $wgUser->getSkin();
1725                 $parents = array();
1726                 $dbr =& wfGetDB( DB_SLAVE );
1727                 $categorylinks = $dbr->tableName( 'categorylinks' );
1728
1729                 # NEW SQL
1730                 $sql = "SELECT * FROM $categorylinks"
1731                      ." WHERE cl_from='$titlekey'"
1732                          ." AND cl_from <> '0'"
1733                          ." ORDER BY cl_sortkey";
1734
1735                 $res = $dbr->query ( $sql ) ;
1736
1737                 if($dbr->numRows($res) > 0) {
1738                         while ( $x = $dbr->fetchObject ( $res ) )
1739                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
1740                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
1741                         $dbr->freeResult ( $res ) ;
1742                 } else {
1743                         $data = '';
1744                 }
1745                 return $data;
1746         }
1747
1748         /**
1749          * Get a tree of parent categories
1750          * @param array $children an array with the children in the keys, to check for circular refs
1751          * @return array
1752          * @access public
1753          */
1754         function getParentCategoryTree( $children = array() ) {
1755                 $parents = $this->getParentCategories();
1756
1757                 if($parents != '') {
1758                         foreach($parents as $parent => $current)
1759                         {
1760                                 if ( array_key_exists( $parent, $children ) ) {
1761                                         # Circular reference
1762                                         $stack[$parent] = array();
1763                                 } else {
1764                                         $nt = Title::newFromText($parent);
1765                                         $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
1766                                 }
1767                         }
1768                         return $stack;
1769                 } else {
1770                         return array();
1771                 }
1772         }
1773
1774
1775         /**
1776          * Get an associative array for selecting this title from
1777          * the "cur" table
1778          *
1779          * @return array
1780          * @access public
1781          */
1782         function curCond() {
1783                 return array( 'cur_namespace' => $this->mNamespace, 'cur_title' => $this->mDbkeyform );
1784         }
1785
1786         /**
1787          * Get an associative array for selecting this title from the
1788          * "old" table
1789          *
1790          * @return array
1791          * @access public
1792          */
1793         function oldCond() {
1794                 return array( 'old_namespace' => $this->mNamespace, 'old_title' => $this->mDbkeyform );
1795         }
1796
1797         /**
1798          * Get the revision ID of the previous revision
1799          *
1800          * @param integer $revision  Revision ID. Get the revision that was before this one.
1801          * @return interger $oldrevision|false
1802          */
1803         function getPreviousRevisionID( $revision ) {
1804                 $dbr =& wfGetDB( DB_SLAVE );
1805                 return $dbr->selectField( 'old', 'old_id',
1806                         'old_title=' . $dbr->addQuotes( $this->getDBkey() ) .
1807                         ' AND old_namespace=' . IntVal( $this->getNamespace() ) .
1808                         ' AND old_id<' . IntVal( $revision ) . ' ORDER BY old_id DESC' );
1809         }
1810
1811         /**
1812          * Get the revision ID of the next revision
1813          *
1814          * @param integer $revision  Revision ID. Get the revision that was after this one.
1815          * @return interger $oldrevision|false
1816          */
1817         function getNextRevisionID( $revision ) {
1818                 $dbr =& wfGetDB( DB_SLAVE );
1819                 return $dbr->selectField( 'old', 'old_id',
1820                         'old_title=' . $dbr->addQuotes( $this->getDBkey() ) .
1821                         ' AND old_namespace=' . IntVal( $this->getNamespace() ) .
1822                         ' AND old_id>' . IntVal( $revision ) . ' ORDER BY old_id' );
1823         }
1824
1825 }
1826 ?>