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                                                         if( $t == '' ) {
1115                                                                 # Can't have an empty self-link
1116                                                                 wfProfileOut( $fname );
1117                                                                 return false;
1118                                                         }
1119                                                         $this->mInterwiki = '';
1120                                                         $firstPass = false;
1121                                                         # Do another namespace split...
1122                                                         continue;
1123                                                 }
1124                                         }
1125                                         # If there's no recognized interwiki or namespace,
1126                                         # then let the colon expression be part of the title.
1127                                 }
1128                                 break;
1129                         } while( true );
1130                         $r = $t;
1131                 }
1132
1133                 # We already know that some pages won't be in the database!
1134                 #
1135                 if ( '' != $this->mInterwiki || -1 == $this->mNamespace ) {
1136                         $this->mArticleID = 0;
1137                 }
1138                 $f = strstr( $r, '#' );
1139                 if ( false !== $f ) {
1140                         $this->mFragment = substr( $f, 1 );
1141                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
1142                         # remove whitespace again: prevents "Foo_bar_#"
1143                         # becoming "Foo_bar_"
1144                         $r = preg_replace( '/_*$/', '', $r );
1145                 }
1146
1147                 # Reject illegal characters.
1148                 #
1149                 if( preg_match( $rxTc, $r ) ) {
1150                         wfProfileOut( $fname );
1151                         return false;
1152                 }
1153
1154                 /**
1155                  * Pages with "/./" or "/../" appearing in the URLs will
1156                  * often be unreachable due to the way web browsers deal
1157                  * with 'relative' URLs. Forbid them explicitly.
1158                  */
1159                 if ( strpos( $r, '.' ) !== false &&
1160                      ( $r === '.' || $r === '..' ||
1161                        strpos( $r, './' ) === 0  ||
1162                        strpos( $r, '../' ) === 0 ||
1163                        strpos( $r, '/./' ) !== false ||
1164                        strpos( $r, '/../' ) !== false ) )
1165                 {
1166                         wfProfileOut( $fname );
1167                         return false;
1168                 }
1169
1170                 # We shouldn't need to query the DB for the size.
1171                 #$maxSize = $dbr->textFieldSize( 'cur', 'cur_title' );
1172                 if ( strlen( $r ) > 255 ) {
1173                         return false;
1174                 }
1175
1176                 /**
1177                  * Normally, all wiki links are forced to have
1178                  * an initial capital letter so [[foo]] and [[Foo]]
1179                  * point to the same place.
1180                  *
1181                  * Don't force it for interwikis, since the other
1182                  * site might be case-sensitive.
1183                  */
1184                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1185                         $t = $wgContLang->ucfirst( $r );
1186                 } else {
1187                         $t = $r;
1188                 }
1189
1190                 # Fill fields
1191                 $this->mDbkeyform = $t;
1192                 $this->mUrlform = wfUrlencode( $t );
1193
1194                 $this->mTextform = str_replace( '_', ' ', $t );
1195
1196                 wfProfileOut( $fname );
1197                 return true;
1198         }
1199
1200         /**
1201          * Get a Title object associated with the talk page of this article
1202          * @return Title the object for the talk page
1203          * @access public
1204          */
1205         function getTalkPage() {
1206                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1207         }
1208
1209         /**
1210          * Get a title object associated with the subject page of this
1211          * talk page
1212          *
1213          * @return Title the object for the subject page
1214          * @access public
1215          */
1216         function getSubjectPage() {
1217                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1218         }
1219
1220         /**
1221          * Get an array of Title objects linking to this Title
1222          * - Also stores the IDs in the link cache.
1223          *
1224          * @param string $options may be FOR UPDATE
1225          * @return array the Title objects linking here
1226          * @access public
1227          */
1228         function getLinksTo( $options = '' ) {
1229                 global $wgLinkCache;
1230                 $id = $this->getArticleID();
1231
1232                 if ( $options ) {
1233                         $db =& wfGetDB( DB_MASTER );
1234                 } else {
1235                         $db =& wfGetDB( DB_SLAVE );
1236                 }
1237                 $cur = $db->tableName( 'cur' );
1238                 $links = $db->tableName( 'links' );
1239
1240                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM $cur,$links WHERE l_from=cur_id AND l_to={$id} $options";
1241                 $res = $db->query( $sql, 'Title::getLinksTo' );
1242                 $retVal = array();
1243                 if ( $db->numRows( $res ) ) {
1244                         while ( $row = $db->fetchObject( $res ) ) {
1245                                 if ( $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title ) ) {
1246                                         $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
1247                                         $retVal[] = $titleObj;
1248                                 }
1249                         }
1250                 }
1251                 $db->freeResult( $res );
1252                 return $retVal;
1253         }
1254
1255         /**
1256          * Get an array of Title objects linking to this non-existent title.
1257          * - Also stores the IDs in the link cache.
1258          *
1259          * @param string $options may be FOR UPDATE
1260          * @return array the Title objects linking here
1261          * @access public
1262          */
1263         function getBrokenLinksTo( $options = '' ) {
1264                 global $wgLinkCache;
1265
1266                 if ( $options ) {
1267                         $db =& wfGetDB( DB_MASTER );
1268                 } else {
1269                         $db =& wfGetDB( DB_SLAVE );
1270                 }
1271                 $cur = $db->tableName( 'cur' );
1272                 $brokenlinks = $db->tableName( 'brokenlinks' );
1273                 $encTitle = $db->strencode( $this->getPrefixedDBkey() );
1274
1275                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM $brokenlinks,$cur " .
1276                   "WHERE bl_from=cur_id AND bl_to='$encTitle' $options";
1277                 $res = $db->query( $sql, "Title::getBrokenLinksTo" );
1278                 $retVal = array();
1279                 if ( $db->numRows( $res ) ) {
1280                         while ( $row = $db->fetchObject( $res ) ) {
1281                                 $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title );
1282                                 $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
1283                                 $retVal[] = $titleObj;
1284                         }
1285                 }
1286                 $db->freeResult( $res );
1287                 return $retVal;
1288         }
1289
1290         /**
1291          * Get a list of URLs to purge from the Squid cache when this
1292          * page changes
1293          *
1294          * @return array the URLs
1295          * @access public
1296          */
1297         function getSquidURLs() {
1298                 return array(
1299                         $this->getInternalURL(),
1300                         $this->getInternalURL( 'action=history' )
1301                 );
1302         }
1303
1304         /**
1305          * Move this page without authentication
1306          * @param Title &$nt the new page Title
1307          * @access public
1308          */
1309         function moveNoAuth( &$nt ) {
1310                 return $this->moveTo( $nt, false );
1311         }
1312
1313         /**
1314          * Move a title to a new location
1315          * @param Title &$nt the new title
1316          * @param bool $auth indicates whether $wgUser's permissions
1317          *      should be checked
1318          * @return mixed true on success, message name on failure
1319          * @access public
1320          */
1321         function moveTo( &$nt, $auth = true ) {
1322                 if( !$this or !$nt ) {
1323                         return 'badtitletext';
1324                 }
1325
1326                 $fname = 'Title::move';
1327                 $oldid = $this->getArticleID();
1328                 $newid = $nt->getArticleID();
1329
1330                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1331                         return 'articleexists';
1332                 }
1333                 if ( ( ! Namespace::isMovable( $this->getNamespace() ) ) ||
1334                          ( '' == $this->getDBkey() ) ||
1335                          ( '' != $this->getInterwiki() ) ||
1336                          ( !$oldid ) ||
1337                      ( ! Namespace::isMovable( $nt->getNamespace() ) ) ||
1338                          ( '' == $nt->getDBkey() ) ||
1339                          ( '' != $nt->getInterwiki() ) ) {
1340                         return 'badarticleerror';
1341                 }
1342
1343                 if ( $auth && ( !$this->userCanEdit() || !$nt->userCanEdit() ) ) {
1344                         return 'protectedpage';
1345                 }
1346
1347                 # The move is allowed only if (1) the target doesn't exist, or
1348                 # (2) the target is a redirect to the source, and has no history
1349                 # (so we can undo bad moves right after they're done).
1350
1351                 if ( 0 != $newid ) { # Target exists; check for validity
1352                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1353                                 return 'articleexists';
1354                         }
1355                         $this->moveOverExistingRedirect( $nt );
1356                 } else { # Target didn't exist, do normal move.
1357                         $this->moveToNewTitle( $nt, $newid );
1358                 }
1359
1360                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
1361
1362                 $dbw =& wfGetDB( DB_MASTER );
1363                 $sql = "UPDATE categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
1364                         " WHERE cl_from=" . $dbw->addQuotes( $this->getArticleID() ) .
1365                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
1366                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
1367
1368                 # Update watchlists
1369
1370                 $oldnamespace = $this->getNamespace() & ~1;
1371                 $newnamespace = $nt->getNamespace() & ~1;
1372                 $oldtitle = $this->getDBkey();
1373                 $newtitle = $nt->getDBkey();
1374
1375                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
1376                         WatchedItem::duplicateEntries( $this, $nt );
1377                 }
1378
1379                 # Update search engine
1380                 $u = new SearchUpdate( $oldid, $nt->getPrefixedDBkey() );
1381                 $u->doUpdate();
1382                 $u = new SearchUpdate( $newid, $this->getPrefixedDBkey(), '' );
1383                 $u->doUpdate();
1384
1385                 return true;
1386         }
1387
1388         /**
1389          * Move page to a title which is at present a redirect to the
1390          * source page
1391          *
1392          * @param Title &$nt the page to move to, which should currently
1393          *      be a redirect
1394          * @access private
1395          */
1396         /* private */ function moveOverExistingRedirect( &$nt ) {
1397                 global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
1398                 $fname = 'Title::moveOverExistingRedirect';
1399                 $comment = wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1400
1401                 $now = wfTimestampNow();
1402                 $won = wfInvertTimestamp( $now );
1403                 $newid = $nt->getArticleID();
1404                 $oldid = $this->getArticleID();
1405                 $dbw =& wfGetDB( DB_MASTER );
1406                 $links = $dbw->tableName( 'links' );
1407
1408                 # Change the name of the target page:
1409                 $dbw->update( 'cur',
1410                         /* SET */ array(
1411                                 'cur_touched' => $dbw->timestamp($now),
1412                                 'cur_namespace' => $nt->getNamespace(),
1413                                 'cur_title' => $nt->getDBkey()
1414                         ),
1415                         /* WHERE */ array( 'cur_id' => $oldid ),
1416                         $fname
1417                 );
1418                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1419
1420                 # Repurpose the old redirect. We don't save it to history since
1421                 # by definition if we've got here it's rather uninteresting.
1422
1423                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1424                 $dbw->update( 'cur',
1425                         /* SET */ array(
1426                                 'cur_touched' => $dbw->timestamp($now),
1427                                 'cur_timestamp' => $dbw->timestamp($now),
1428                                 'inverse_timestamp' => $won,
1429                                 'cur_namespace' => $this->getNamespace(),
1430                                 'cur_title' => $this->getDBkey(),
1431                                 'cur_text' => $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n",
1432                                 'cur_comment' => $comment,
1433                                 'cur_user' => $wgUser->getID(),
1434                                 'cur_minor_edit' => 0,
1435                                 'cur_counter' => 0,
1436                                 'cur_restrictions' => '',
1437                                 'cur_user_text' => $wgUser->getName(),
1438                                 'cur_is_redirect' => 1,
1439                                 'cur_is_new' => 1
1440                         ),
1441                         /* WHERE */ array( 'cur_id' => $newid ),
1442                         $fname
1443                 );
1444
1445                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1446
1447                 # Fix the redundant names for the past revisions of the target page.
1448                 # The redirect should have no old revisions.
1449                 $dbw->update(
1450                         /* table */ 'old',
1451                         /* SET */ array(
1452                                 'old_namespace' => $nt->getNamespace(),
1453                                 'old_title' => $nt->getDBkey(),
1454                         ),
1455                         /* WHERE */ array(
1456                                 'old_namespace' => $this->getNamespace(),
1457                                 'old_title' => $this->getDBkey(),
1458                         ),
1459                         $fname
1460                 );
1461
1462                 RecentChange::notifyMoveOverRedirect( $now, $this, $nt, $wgUser, $comment );
1463
1464                 # Swap links
1465
1466                 # Load titles and IDs
1467                 $linksToOld = $this->getLinksTo( 'FOR UPDATE' );
1468                 $linksToNew = $nt->getLinksTo( 'FOR UPDATE' );
1469
1470                 # Delete them all
1471                 $sql = "DELETE FROM $links WHERE l_to=$oldid OR l_to=$newid";
1472                 $dbw->query( $sql, $fname );
1473
1474                 # Reinsert
1475                 if ( count( $linksToOld ) || count( $linksToNew )) {
1476                         $sql = "INSERT INTO $links (l_from,l_to) VALUES ";
1477                         $first = true;
1478
1479                         # Insert links to old title
1480                         foreach ( $linksToOld as $linkTitle ) {
1481                                 if ( $first ) {
1482                                         $first = false;
1483                                 } else {
1484                                         $sql .= ',';
1485                                 }
1486                                 $id = $linkTitle->getArticleID();
1487                                 $sql .= "($id,$newid)";
1488                         }
1489
1490                         # Insert links to new title
1491                         foreach ( $linksToNew as $linkTitle ) {
1492                                 if ( $first ) {
1493                                         $first = false;
1494                                 } else {
1495                                         $sql .= ',';
1496                                 }
1497                                 $id = $linkTitle->getArticleID();
1498                                 $sql .= "($id, $oldid)";
1499                         }
1500
1501                         $dbw->query( $sql, DB_MASTER, $fname );
1502                 }
1503
1504                 # Now, we record the link from the redirect to the new title.
1505                 # It should have no other outgoing links...
1506                 $dbw->delete( 'links', array( 'l_from' => $newid ) );
1507                 $dbw->insert( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ) );
1508
1509                 # Clear linkscc
1510                 LinkCache::linksccClearLinksTo( $oldid );
1511                 LinkCache::linksccClearLinksTo( $newid );
1512
1513                 # Purge squid
1514                 if ( $wgUseSquid ) {
1515                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1516                         $u = new SquidUpdate( $urls );
1517                         $u->doUpdate();
1518                 }
1519         }
1520
1521         /**
1522          * Move page to non-existing title.
1523          * @param Title &$nt the new Title
1524          * @param int &$newid set to be the new article ID
1525          * @access private
1526          */
1527         /* private */ function moveToNewTitle( &$nt, &$newid ) {
1528                 global $wgUser, $wgLinkCache, $wgUseSquid;
1529                 $fname = 'MovePageForm::moveToNewTitle';
1530                 $comment = wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1531
1532                 $newid = $nt->getArticleID();
1533                 $oldid = $this->getArticleID();
1534                 $dbw =& wfGetDB( DB_MASTER );
1535                 $now = $dbw->timestamp();
1536                 $won = wfInvertTimestamp( wfTimestamp(TS_MW,$now) );
1537                 wfSeedRandom();
1538                 $rand = wfRandom();
1539
1540                 # Rename cur entry
1541                 $dbw->update( 'cur',
1542                         /* SET */ array(
1543                                 'cur_touched' => $now,
1544                                 'cur_namespace' => $nt->getNamespace(),
1545                                 'cur_title' => $nt->getDBkey()
1546                         ),
1547                         /* WHERE */ array( 'cur_id' => $oldid ),
1548                         $fname
1549                 );
1550
1551                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1552
1553                 # Insert redirect
1554                 $dbw->insert( 'cur', array(
1555                         'cur_id' => $dbw->nextSequenceValue('cur_cur_id_seq'),
1556                         'cur_namespace' => $this->getNamespace(),
1557                         'cur_title' => $this->getDBkey(),
1558                         'cur_comment' => $comment,
1559                         'cur_user' => $wgUser->getID(),
1560                         'cur_user_text' => $wgUser->getName(),
1561                         'cur_timestamp' => $now,
1562                         'inverse_timestamp' => $won,
1563                         'cur_touched' => $now,
1564                         'cur_is_redirect' => 1,
1565                         'cur_random' => $rand,
1566                         'cur_is_new' => 1,
1567                         'cur_text' => "#REDIRECT [[" . $nt->getPrefixedText() . "]]\n" ), $fname
1568                 );
1569                 $newid = $dbw->insertId();
1570                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1571
1572                 # Rename old entries
1573                 $dbw->update(
1574                         /* table */ 'old',
1575                         /* SET */ array(
1576                                 'old_namespace' => $nt->getNamespace(),
1577                                 'old_title' => $nt->getDBkey()
1578                         ),
1579                         /* WHERE */ array(
1580                                 'old_namespace' => $this->getNamespace(),
1581                                 'old_title' => $this->getDBkey()
1582                         ), $fname
1583                 );
1584
1585                 # Record in RC
1586                 RecentChange::notifyMoveToNew( $now, $this, $nt, $wgUser, $comment );
1587
1588                 # Purge squid and linkscc as per article creation
1589                 Article::onArticleCreate( $nt );
1590
1591                 # Any text links to the old title must be reassigned to the redirect
1592                 $dbw->update( 'links', array( 'l_to' => $newid ), array( 'l_to' => $oldid ), $fname );
1593                 LinkCache::linksccClearLinksTo( $oldid );
1594
1595                 # Record the just-created redirect's linking to the page
1596                 $dbw->insert( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ), $fname );
1597
1598                 # Non-existent target may have had broken links to it; these must
1599                 # now be removed and made into good links.
1600                 $update = new LinksUpdate( $oldid, $nt->getPrefixedDBkey() );
1601                 $update->fixBrokenLinks();
1602
1603                 # Purge old title from squid
1604                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1605                 $titles = $nt->getLinksTo();
1606                 if ( $wgUseSquid ) {
1607                         $urls = $this->getSquidURLs();
1608                         foreach ( $titles as $linkTitle ) {
1609                                 $urls[] = $linkTitle->getInternalURL();
1610                         }
1611                         $u = new SquidUpdate( $urls );
1612                         $u->doUpdate();
1613                 }
1614         }
1615
1616         /**
1617          * Checks if $this can be moved to a given Title
1618          * - Selects for update, so don't call it unless you mean business
1619          *
1620          * @param Title &$nt the new title to check
1621          * @access public
1622          */
1623         function isValidMoveTarget( $nt ) {
1624                 $fname = 'Title::isValidMoveTarget';
1625                 $dbw =& wfGetDB( DB_MASTER );
1626
1627                 # Is it a redirect?
1628                 $id  = $nt->getArticleID();
1629                 $obj = $dbw->selectRow( 'cur', array( 'cur_is_redirect','cur_text' ),
1630                         array( 'cur_id' => $id ), $fname, 'FOR UPDATE' );
1631
1632                 if ( !$obj || 0 == $obj->cur_is_redirect ) {
1633                         # Not a redirect
1634                         return false;
1635                 }
1636
1637                 # Does the redirect point to the source?
1638                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $obj->cur_text, $m ) ) {
1639                         $redirTitle = Title::newFromText( $m[1] );
1640                         if( !is_object( $redirTitle ) ||
1641                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1642                                 return false;
1643                         }
1644                 }
1645
1646                 # Does the article have a history?
1647                 $row = $dbw->selectRow( 'old', array( 'old_id' ),
1648                         array(
1649                                 'old_namespace' => $nt->getNamespace(),
1650                                 'old_title' => $nt->getDBkey()
1651                         ), $fname, 'FOR UPDATE'
1652                 );
1653
1654                 # Return true if there was no history
1655                 return $row === false;
1656         }
1657
1658         /**
1659          * Create a redirect; fails if the title already exists; does
1660          * not notify RC
1661          *
1662          * @param Title $dest the destination of the redirect
1663          * @param string $comment the comment string describing the move
1664          * @return bool true on success
1665          * @access public
1666          */
1667         function createRedirect( $dest, $comment ) {
1668                 global $wgUser;
1669                 if ( $this->getArticleID() ) {
1670                         return false;
1671                 }
1672
1673                 $fname = 'Title::createRedirect';
1674                 $dbw =& wfGetDB( DB_MASTER );
1675                 $now = wfTimestampNow();
1676                 $won = wfInvertTimestamp( $now );
1677                 $seqVal = $dbw->nextSequenceValue( 'cur_cur_id_seq' );
1678
1679                 $dbw->insert( 'cur', array(
1680                         'cur_id' => $seqVal,
1681                         'cur_namespace' => $this->getNamespace(),
1682                         'cur_title' => $this->getDBkey(),
1683                         'cur_comment' => $comment,
1684                         'cur_user' => $wgUser->getID(),
1685                         'cur_user_text' => $wgUser->getName(),
1686                         'cur_timestamp' => $now,
1687                         'inverse_timestamp' => $won,
1688                         'cur_touched' => $now,
1689                         'cur_is_redirect' => 1,
1690                         'cur_is_new' => 1,
1691                         'cur_text' => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n"
1692                 ), $fname );
1693                 $newid = $dbw->insertId();
1694                 $this->resetArticleID( $newid );
1695
1696                 # Link table
1697                 if ( $dest->getArticleID() ) {
1698                         $dbw->insert( 'links',
1699                                 array(
1700                                         'l_to' => $dest->getArticleID(),
1701                                         'l_from' => $newid
1702                                 ), $fname
1703                         );
1704                 } else {
1705                         $dbw->insert( 'brokenlinks',
1706                                 array(
1707                                         'bl_to' => $dest->getPrefixedDBkey(),
1708                                         'bl_from' => $newid
1709                                 ), $fname
1710                         );
1711                 }
1712
1713                 Article::onArticleCreate( $this );
1714                 return true;
1715         }
1716
1717         /**
1718          * Get categories to which this Title belongs and return an array of
1719          * categories' names.
1720          *
1721          * @return array an array of parents in the form:
1722          *      $parent => $currentarticle
1723          * @access public
1724          */
1725         function getParentCategories() {
1726                 global $wgContLang,$wgUser;
1727
1728                 $titlekey = $this->getArticleId();
1729                 $sk =& $wgUser->getSkin();
1730                 $parents = array();
1731                 $dbr =& wfGetDB( DB_SLAVE );
1732                 $categorylinks = $dbr->tableName( 'categorylinks' );
1733
1734                 # NEW SQL
1735                 $sql = "SELECT * FROM $categorylinks"
1736                      ." WHERE cl_from='$titlekey'"
1737                          ." AND cl_from <> '0'"
1738                          ." ORDER BY cl_sortkey";
1739
1740                 $res = $dbr->query ( $sql ) ;
1741
1742                 if($dbr->numRows($res) > 0) {
1743                         while ( $x = $dbr->fetchObject ( $res ) )
1744                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
1745                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
1746                         $dbr->freeResult ( $res ) ;
1747                 } else {
1748                         $data = '';
1749                 }
1750                 return $data;
1751         }
1752
1753         /**
1754          * Get a tree of parent categories
1755          * @param array $children an array with the children in the keys, to check for circular refs
1756          * @return array
1757          * @access public
1758          */
1759         function getParentCategoryTree( $children = array() ) {
1760                 $parents = $this->getParentCategories();
1761
1762                 if($parents != '') {
1763                         foreach($parents as $parent => $current)
1764                         {
1765                                 if ( array_key_exists( $parent, $children ) ) {
1766                                         # Circular reference
1767                                         $stack[$parent] = array();
1768                                 } else {
1769                                         $nt = Title::newFromText($parent);
1770                                         $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
1771                                 }
1772                         }
1773                         return $stack;
1774                 } else {
1775                         return array();
1776                 }
1777         }
1778
1779
1780         /**
1781          * Get an associative array for selecting this title from
1782          * the "cur" table
1783          *
1784          * @return array
1785          * @access public
1786          */
1787         function curCond() {
1788                 return array( 'cur_namespace' => $this->mNamespace, 'cur_title' => $this->mDbkeyform );
1789         }
1790
1791         /**
1792          * Get an associative array for selecting this title from the
1793          * "old" table
1794          *
1795          * @return array
1796          * @access public
1797          */
1798         function oldCond() {
1799                 return array( 'old_namespace' => $this->mNamespace, 'old_title' => $this->mDbkeyform );
1800         }
1801
1802         /**
1803          * Get the revision ID of the previous revision
1804          *
1805          * @param integer $revision  Revision ID. Get the revision that was before this one.
1806          * @return interger $oldrevision|false
1807          */
1808         function getPreviousRevisionID( $revision ) {
1809                 $dbr =& wfGetDB( DB_SLAVE );
1810                 return $dbr->selectField( 'old', 'old_id',
1811                         'old_title=' . $dbr->addQuotes( $this->getDBkey() ) .
1812                         ' AND old_namespace=' . IntVal( $this->getNamespace() ) .
1813                         ' AND old_id<' . IntVal( $revision ) . ' ORDER BY old_id DESC' );
1814         }
1815
1816         /**
1817          * Get the revision ID of the next revision
1818          *
1819          * @param integer $revision  Revision ID. Get the revision that was after this one.
1820          * @return interger $oldrevision|false
1821          */
1822         function getNextRevisionID( $revision ) {
1823                 $dbr =& wfGetDB( DB_SLAVE );
1824                 return $dbr->selectField( 'old', 'old_id',
1825                         'old_title=' . $dbr->addQuotes( $this->getDBkey() ) .
1826                         ' AND old_namespace=' . IntVal( $this->getNamespace() ) .
1827                         ' AND old_id>' . IntVal( $revision ) . ' ORDER BY old_id' );
1828         }
1829
1830 }
1831 ?>