includes/Title.php

   1 <?php
   2 /**
   3  * See title.doc
   4  *
   5  * @package MediaWiki
   6  */
   7
   8 /** */
   9 require_once( 'normal/UtfNormal.php' );
  10
  11 $wgTitleInterwikiCache = array();
  12 define ( 'GAID_FOR_UPDATE', 1 );
  13
  14 # Title::newFromTitle maintains a cache to avoid
  15 # expensive re-normalization of commonly used titles.
  16 # On a batch operation this can become a memory leak
  17 # if not bounded. After hitting this many titles,
  18 # reset the cache.
  19 define( 'MW_TITLECACHE_MAX', 1000 );
  20
  21 /**
  22  * Title class
  23  * - Represents a title, which may contain an interwiki designation or namespace
  24  * - Can fetch various kinds of data from the database, albeit inefficiently.
  25  *
  26  * @package MediaWiki
  27  */
  28 class Title {
  29         /**
  30          * All member variables should be considered private
  31          * Please use the accessor functions
  32          */
  33
  34          /**#@+
  35          * @access private
  36          */
  37
  38         var $mTextform;           # Text form (spaces not underscores) of the main part
  39         var $mUrlform;            # URL-encoded form of the main part
  40         var $mDbkeyform;          # Main part with underscores
  41         var $mNamespace;          # Namespace index, i.e. one of the NS_xxxx constants
  42         var $mInterwiki;          # Interwiki prefix (or null string)
  43         var $mFragment;           # Title fragment (i.e. the bit after the #)
  44         var $mArticleID;          # Article ID, fetched from the link cache on demand
  45         var $mRestrictions;       # Array of groups allowed to edit this article
  46                               # Only null or "sysop" are supported
  47         var $mRestrictionsLoaded; # Boolean for initialisation on demand
  48         var $mPrefixedText;       # Text form including namespace/interwiki, initialised on demand
  49         var $mDefaultNamespace;   # Namespace index when there is no namespace
  50                               # Zero except in {{transclusion}} tags
  51         /**#@-*/
  52
  53
  54         /**
  55          * Constructor
  56          * @access private
  57          */
  58         /* private */ function Title() {
  59                 $this->mInterwiki = $this->mUrlform =
  60                 $this->mTextform = $this->mDbkeyform = '';
  61                 $this->mArticleID = -1;
  62                 $this->mNamespace = NS_MAIN;
  63                 $this->mRestrictionsLoaded = false;
  64                 $this->mRestrictions = array();
  65                 # Dont change the following, NS_MAIN is hardcoded in several place
  66                 # See bug #696
  67                 $this->mDefaultNamespace = NS_MAIN;
  68         }
  69
  70         /**
  71          * Create a new Title from a prefixed DB key
  72          * @param string $key The database key, which has underscores
  73          *      instead of spaces, possibly including namespace and
  74          *      interwiki prefixes
  75          * @return Title the new object, or NULL on an error
  76          * @static
  77          * @access public
  78          */
  79         /* static */ function newFromDBkey( $key ) {
  80                 $t = new Title();
  81                 $t->mDbkeyform = $key;
  82                 if( $t->secureAndSplit() )
  83                         return $t;
  84                 else
  85                         return NULL;
  86         }
  87
  88         /**
  89          * Create a new Title from text, such as what one would
  90          * find in a link. Decodes any HTML entities in the text.
  91          *
  92          * @param string $text the link text; spaces, prefixes,
  93          *      and an initial ':' indicating the main namespace
  94          *      are accepted
  95          * @param int $defaultNamespace the namespace to use if
  96          *      none is specified by a prefix
  97          * @return Title the new object, or NULL on an error
  98          * @static
  99          * @access public
 100          */
 101         function &newFromText( $text, $defaultNamespace = NS_MAIN ) {
 102                 $fname = 'Title::newFromText';
 103                 wfProfileIn( $fname );
 104
 105                 if( is_object( $text ) ) {
 106                         wfDebugDieBacktrace( 'Title::newFromText given an object' );
 107                 }
 108
 109                 /**
 110                  * Wiki pages often contain multiple links to the same page.
 111                  * Title normalization and parsing can become expensive on
 112                  * pages with many links, so we can save a little time by
 113                  * caching them.
 114                  *
 115                  * In theory these are value objects and won't get changed...
 116                  */
 117                 static $titleCache = array();
 118                 if( $defaultNamespace == NS_MAIN && isset( $titleCache[$text] ) ) {
 119                         wfProfileOut( $fname );
 120                         return $titleCache[$text];
 121                 }
 122
 123                 /**
 124                  * Convert things like &eacute; into real text...
 125                  */
 126                 global $wgInputEncoding;
 127                 $filteredText = do_html_entity_decode( $text, ENT_COMPAT, $wgInputEncoding );
 128
 129                 /**
 130                  * Convert things like &#257; or &#x3017; into real text...
 131                  * WARNING: Not friendly to internal links on a latin-1 wiki.
 132                  */
 133                 $filteredText = wfMungeToUtf8( $filteredText );
 134
 135                 # What was this for? TS 2004-03-03
 136                 # $text = urldecode( $text );
 137
 138                 $t =& new Title();
 139                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 140                 $t->mDefaultNamespace = $defaultNamespace;
 141
 142                 if( $t->secureAndSplit() ) {
 143                         if( $defaultNamespace == NS_MAIN ) {
 144                                 if( count( $titleCache ) >= MW_TITLECACHE_MAX ) {
 145                                         # Avoid memory leaks on mass operations...
 146                                         $titleCache = array();
 147                                 }
 148                                 $titleCache[$text] =& $t;
 149                         }
 150                         wfProfileOut( $fname );
 151                         return $t;
 152                 } else {
 153                         wfProfileOut( $fname );
 154                         return NULL;
 155                 }
 156         }
 157
 158         /**
 159          * Create a new Title from URL-encoded text. Ensures that
 160          * the given title's length does not exceed the maximum.
 161          * @param string $url the title, as might be taken from a URL
 162          * @return Title the new object, or NULL on an error
 163          * @static
 164          * @access public
 165          */
 166         /* static */ function newFromURL( $url ) {
 167                 global $wgLang, $wgServer;
 168                 $t = new Title();
 169
 170                 # For compatibility with old buggy URLs. "+" is not valid in titles,
 171                 # but some URLs used it as a space replacement and they still come
 172                 # from some external search tools.
 173                 $s = str_replace( '+', ' ', $url );
 174
 175                 $t->mDbkeyform = str_replace( ' ', '_', $s );
 176                 if( $t->secureAndSplit() ) {
 177                         return $t;
 178                 } else {
 179                         return NULL;
 180                 }
 181         }
 182
 183         /**
 184          * Create a new Title from an article ID
 185          * @todo This is inefficiently implemented, the page row is requested
 186          * but not used for anything else
 187          * @param int $id the page_id corresponding to the Title to create
 188          * @return Title the new object, or NULL on an error
 189          * @access public
 190          */
 191         /* static */ function newFromID( $id ) {
 192                 $fname = 'Title::newFromID';
 193                 $dbr =& wfGetDB( DB_SLAVE );
 194                 $row = $dbr->selectRow( 'page', array( 'page_namespace', 'page_title' ),
 195                         array( 'page_id' => $id ), $fname );
 196                 if ( $row !== false ) {
 197                         $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 198                 } else {
 199                         $title = NULL;
 200                 }
 201                 return $title;
 202         }
 203
 204         /**
 205          * Create a new Title from a namespace index and a DB key.
 206          * It's assumed that $ns and $title are *valid*, for instance when
 207          * they came directly from the database or a special page name.
 208          * For convenience, spaces are converted to underscores so that
 209          * eg user_text fields can be used directly.
 210          *
 211          * @param int $ns the namespace of the article
 212          * @param string $title the unprefixed database key form
 213          * @return Title the new object
 214          * @static
 215          * @access public
 216          */
 217         /* static */ function &makeTitle( $ns, $title ) {
 218                 $t =& new Title();
 219                 $t->mInterwiki = '';
 220                 $t->mFragment = '';
 221                 $t->mNamespace = IntVal( $ns );
 222                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 223                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 224                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 225                 $t->mTextform = str_replace( '_', ' ', $title );
 226                 return $t;
 227         }
 228
 229         /**
 230          * Create a new Title frrom a namespace index and a DB key.
 231          * The parameters will be checked for validity, which is a bit slower
 232          * than makeTitle() but safer for user-provided data.
 233          * @param int $ns the namespace of the article
 234          * @param string $title the database key form
 235          * @return Title the new object, or NULL on an error
 236          * @static
 237          * @access public
 238          */
 239         /* static */ function makeTitleSafe( $ns, $title ) {
 240                 $t = new Title();
 241                 $t->mDbkeyform = Title::makeName( $ns, $title );
 242                 if( $t->secureAndSplit() ) {
 243                         return $t;
 244                 } else {
 245                         return NULL;
 246                 }
 247         }
 248
 249         /**
 250          * Create a new Title for the Main Page
 251          * @static
 252          * @return Title the new object
 253          * @access public
 254          */
 255         /* static */ function newMainPage() {
 256                 return Title::newFromText( wfMsgForContent( 'mainpage' ) );
 257         }
 258
 259         /**
 260          * Create a new Title for a redirect
 261          * @param string $text the redirect title text
 262          * @return Title the new object, or NULL if the text is not a
 263          *      valid redirect
 264          * @static
 265          * @access public
 266          */
 267         /* static */ function newFromRedirect( $text ) {
 268                 global $wgMwRedir;
 269                 $rt = NULL;
 270                 if ( $wgMwRedir->matchStart( $text ) ) {
 271                         if ( preg_match( '/\\[\\[([^\\]\\|]+)[\\]\\|]/', $text, $m ) ) {
 272                                 # categories are escaped using : for example one can enter:
 273                                 # #REDIRECT [[:Category:Music]]. Need to remove it.
 274                                 if ( substr($m[1],0,1) == ':') {
 275                                         # We don't want to keep the ':'
 276                                         $m[1] = substr( $m[1], 1 );
 277                                 }
 278
 279                                 $rt = Title::newFromText( $m[1] );
 280                                 # Disallow redirects to Special:Userlogout
 281                                 if ( !is_null($rt) && $rt->getNamespace() == NS_SPECIAL && preg_match( '/^Userlogout/i', $rt->getText() ) ) {
 282                                         $rt = NULL;
 283                                 }
 284                         }
 285                 }
 286                 return $rt;
 287         }
 288
 289 #----------------------------------------------------------------------------
 290 #       Static functions
 291 #----------------------------------------------------------------------------
 292
 293         /**
 294          * Get the prefixed DB key associated with an ID
 295          * @param int $id the page_id of the article
 296          * @return Title an object representing the article, or NULL
 297          *      if no such article was found
 298          * @static
 299          * @access public
 300          */
 301         /* static */ function nameOf( $id ) {
 302                 $fname = 'Title::nameOf';
 303                 $dbr =& wfGetDB( DB_SLAVE );
 304
 305                 $s = $dbr->selectRow( 'page', array( 'page_namespace','page_title' ),  array( 'page_id' => $id ), $fname );
 306                 if ( $s === false ) { return NULL; }
 307
 308                 $n = Title::makeName( $s->page_namespace, $s->page_title );
 309                 return $n;
 310         }
 311
 312         /**
 313          * Get a regex character class describing the legal characters in a link
 314          * @return string the list of characters, not delimited
 315          * @static
 316          * @access public
 317          */
 318         /* static */ function legalChars() {
 319                 # Missing characters:
 320                 #  * []|# Needed for link syntax
 321                 #  * % and + are corrupted by Apache when they appear in the path
 322                 #
 323                 # % seems to work though
 324                 #
 325                 # The problem with % is that URLs are double-unescaped: once by Apache's
 326                 # path conversion code, and again by PHP. So %253F, for example, becomes "?".
 327                 # Our code does not double-escape to compensate for this, indeed double escaping
 328                 # would break if the double-escaped title was passed in the query string
 329                 # rather than the path. This is a minor security issue because articles can be
 330                 # created such that they are hard to view or edit. -- TS
 331                 #
 332                 # Theoretically 0x80-0x9F of ISO 8859-1 should be disallowed, but
 333                 # this breaks interlanguage links
 334
 335                 $set = " %!\"$&'()*,\\-.\\/0-9:;=?@A-Z\\\\^_`a-z~\\x80-\\xFF";
 336                 return $set;
 337         }
 338
 339         /**
 340          * Get a string representation of a title suitable for
 341          * including in a search index
 342          *
 343          * @param int $ns a namespace index
 344          * @param string $title text-form main part
 345          * @return string a stripped-down title string ready for the
 346          *      search index
 347          */
 348         /* static */ function indexTitle( $ns, $title ) {
 349                 global $wgDBminWordLen, $wgContLang;
 350                 require_once( 'SearchEngine.php' );
 351
 352                 $lc = SearchEngine::legalSearchChars() . '&#;';
 353                 $t = $wgContLang->stripForSearch( $title );
 354                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 355                 $t = strtolower( $t );
 356
 357                 # Handle 's, s'
 358                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 359                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 360
 361                 $t = preg_replace( "/\\s+/", ' ', $t );
 362
 363                 if ( $ns == NS_IMAGE ) {
 364                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 365                 }
 366                 return trim( $t );
 367         }
 368
 369         /*
 370          * Make a prefixed DB key from a DB key and a namespace index
 371          * @param int $ns numerical representation of the namespace
 372          * @param string $title the DB key form the title
 373          * @return string the prefixed form of the title
 374          */
 375         /* static */ function makeName( $ns, $title ) {
 376                 global $wgContLang;
 377
 378                 $n = $wgContLang->getNsText( $ns );
 379                 if ( '' == $n ) { return $title; }
 380                 else { return $n.':'.$title; }
 381         }
 382
 383         /**
 384          * Returns the URL associated with an interwiki prefix
 385          * @param string $key the interwiki prefix (e.g. "MeatBall")
 386          * @return the associated URL, containing "$1", which should be
 387          *      replaced by an article title
 388          * @static (arguably)
 389          * @access public
 390          */
 391         function getInterwikiLink( $key ) {
 392                 global $wgMemc, $wgDBname, $wgInterwikiExpiry, $wgTitleInterwikiCache;
 393                 $fname = 'Title::getInterwikiLink';
 394
 395                 wfProfileIn( $fname );
 396
 397                 $k = $wgDBname.':interwiki:'.$key;
 398                 if( array_key_exists( $k, $wgTitleInterwikiCache ) ) {
 399                         wfProfileOut( $fname );
 400                         return $wgTitleInterwikiCache[$k]->iw_url;
 401                 }
 402
 403                 $s = $wgMemc->get( $k );
 404                 # Ignore old keys with no iw_local
 405                 if( $s && isset( $s->iw_local ) ) {
 406                         $wgTitleInterwikiCache[$k] = $s;
 407                         wfProfileOut( $fname );
 408                         return $s->iw_url;
 409                 }
 410
 411                 $dbr =& wfGetDB( DB_SLAVE );
 412                 $res = $dbr->select( 'interwiki',
 413                         array( 'iw_url', 'iw_local' ),
 414                         array( 'iw_prefix' => $key ), $fname );
 415                 if( !$res ) {
 416                         wfProfileOut( $fname );
 417                         return '';
 418                 }
 419
 420                 $s = $dbr->fetchObject( $res );
 421                 if( !$s ) {
 422                         # Cache non-existence: create a blank object and save it to memcached
 423                         $s = (object)false;
 424                         $s->iw_url = '';
 425                         $s->iw_local = 0;
 426                 }
 427                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 428                 $wgTitleInterwikiCache[$k] = $s;
 429
 430                 wfProfileOut( $fname );
 431                 return $s->iw_url;
 432         }
 433
 434         /**
 435          * Determine whether the object refers to a page within
 436          * this project.
 437          *
 438          * @return bool TRUE if this is an in-project interwiki link
 439          *      or a wikilink, FALSE otherwise
 440          * @access public
 441          */
 442         function isLocal() {
 443                 global $wgTitleInterwikiCache, $wgDBname;
 444
 445                 if ( $this->mInterwiki != '' ) {
 446                         # Make sure key is loaded into cache
 447                         $this->getInterwikiLink( $this->mInterwiki );
 448                         $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 449                         return (bool)($wgTitleInterwikiCache[$k]->iw_local);
 450                 } else {
 451                         return true;
 452                 }
 453         }
 454
 455         /**
 456          * Update the page_touched field for an array of title objects
 457          * @todo Inefficient unless the IDs are already loaded into the
 458          *      link cache
 459          * @param array $titles an array of Title objects to be touched
 460          * @param string $timestamp the timestamp to use instead of the
 461          *      default current time
 462          * @static
 463          * @access public
 464          */
 465         /* static */ function touchArray( $titles, $timestamp = '' ) {
 466                 if ( count( $titles ) == 0 ) {
 467                         return;
 468                 }
 469                 $dbw =& wfGetDB( DB_MASTER );
 470                 if ( $timestamp == '' ) {
 471                         $timestamp = $dbw->timestamp();
 472                 }
 473                 $page = $dbw->tableName( 'page' );
 474                 $sql = "UPDATE $page SET page_touched='{$timestamp}' WHERE page_id IN (";
 475                 $first = true;
 476
 477                 foreach ( $titles as $title ) {
 478                         if ( ! $first ) {
 479                                 $sql .= ',';
 480                         }
 481                         $first = false;
 482                         $sql .= $title->getArticleID();
 483                 }
 484                 $sql .= ')';
 485                 if ( ! $first ) {
 486                         $dbw->query( $sql, 'Title::touchArray' );
 487                 }
 488         }
 489
 490 #----------------------------------------------------------------------------
 491 #       Other stuff
 492 #----------------------------------------------------------------------------
 493
 494         /** Simple accessors */
 495         /**
 496          * Get the text form (spaces not underscores) of the main part
 497          * @return string
 498          * @access public
 499          */
 500         function getText() { return $this->mTextform; }
 501         /**
 502          * Get the URL-encoded form of the main part
 503          * @return string
 504          * @access public
 505          */
 506         function getPartialURL() { return $this->mUrlform; }
 507         /**
 508          * Get the main part with underscores
 509          * @return string
 510          * @access public
 511          */
 512         function getDBkey() { return $this->mDbkeyform; }
 513         /**
 514          * Get the namespace index, i.e. one of the NS_xxxx constants
 515          * @return int
 516          * @access public
 517          */
 518         function getNamespace() { return $this->mNamespace; }
 519         /**
 520          * Get the interwiki prefix (or null string)
 521          * @return string
 522          * @access public
 523          */
 524         function getInterwiki() { return $this->mInterwiki; }
 525         /**
 526          * Get the Title fragment (i.e. the bit after the #)
 527          * @return string
 528          * @access public
 529          */
 530         function getFragment() { return $this->mFragment; }
 531         /**
 532          * Get the default namespace index, for when there is no namespace
 533          * @return int
 534          * @access public
 535          */
 536         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 537
 538         /**
 539          * Get title for search index
 540          * @return string a stripped-down title string ready for the
 541          *      search index
 542          */
 543         function getIndexTitle() {
 544                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 545         }
 546
 547         /**
 548          * Get the prefixed database key form
 549          * @return string the prefixed title, with underscores and
 550          *      any interwiki and namespace prefixes
 551          * @access public
 552          */
 553         function getPrefixedDBkey() {
 554                 $s = $this->prefix( $this->mDbkeyform );
 555                 $s = str_replace( ' ', '_', $s );
 556                 return $s;
 557         }
 558
 559         /**
 560          * Get the prefixed title with spaces.
 561          * This is the form usually used for display
 562          * @return string the prefixed title, with spaces
 563          * @access public
 564          */
 565         function getPrefixedText() {
 566                 global $wgContLang;
 567                 if ( empty( $this->mPrefixedText ) ) {
 568                         $s = $this->prefix( $this->mTextform );
 569                         $s = str_replace( '_', ' ', $s );
 570                         $this->mPrefixedText = $s;
 571                 }
 572                 return $this->mPrefixedText;
 573         }
 574
 575         /**
 576          * Get the prefixed title with spaces, plus any fragment
 577          * (part beginning with '#')
 578          * @return string the prefixed title, with spaces and
 579          *      the fragment, including '#'
 580          * @access public
 581          */
 582         function getFullText() {
 583                 global $wgContLang;
 584                 $text = $this->getPrefixedText();
 585                 if( '' != $this->mFragment ) {
 586                         $text .= '#' . $this->mFragment;
 587                 }
 588                 return $text;
 589         }
 590
 591         /**
 592          * Get a URL-encoded title (not an actual URL) including interwiki
 593          * @return string the URL-encoded form
 594          * @access public
 595          */
 596         function getPrefixedURL() {
 597                 $s = $this->prefix( $this->mDbkeyform );
 598                 $s = str_replace( ' ', '_', $s );
 599
 600                 $s = wfUrlencode ( $s ) ;
 601
 602                 # Cleaning up URL to make it look nice -- is this safe?
 603                 $s = str_replace( '%28', '(', $s );
 604                 $s = str_replace( '%29', ')', $s );
 605
 606                 return $s;
 607         }
 608
 609         /**
 610          * Get a real URL referring to this title, with interwiki link and
 611          * fragment
 612          *
 613          * @param string $query an optional query string, not used
 614          *      for interwiki links
 615          * @return string the URL
 616          * @access public
 617          */
 618         function getFullURL( $query = '' ) {
 619                 global $wgContLang, $wgArticlePath, $wgServer, $wgScript;
 620
 621                 if ( '' == $this->mInterwiki ) {
 622                         $p = $wgArticlePath;
 623                         return $wgServer . $this->getLocalUrl( $query );
 624                 } else {
 625                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 626                         $namespace = $wgContLang->getNsText( $this->mNamespace );
 627                         if ( '' != $namespace ) {
 628                                 # Can this actually happen? Interwikis shouldn't be parsed.
 629                                 $namepace .= ':';
 630                         }
 631                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 632                         if ( '' != $this->mFragment ) {
 633                                 $url .= '#' . $this->mFragment;
 634                         }
 635                         return $url;
 636                 }
 637         }
 638
 639         /**
 640          * Get a URL with no fragment or server name
 641          * @param string $query an optional query string; if not specified,
 642          *      $wgArticlePath will be used.
 643          * @return string the URL
 644          * @access public
 645          */
 646         function getLocalURL( $query = '' ) {
 647                 global $wgLang, $wgArticlePath, $wgScript;
 648
 649                 if ( $this->isExternal() ) {
 650                         return $this->getFullURL();
 651                 }
 652
 653                 $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 654                 if ( $query == '' ) {
 655                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 656                 } else {
 657                         if( preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) ) {
 658                                 global $wgActionPaths;
 659                                 $action = urldecode( $matches[2] );
 660                                 if( isset( $wgActionPaths[$action] ) ) {
 661                                         $query = $matches[1];
 662                                         if( isset( $matches[4] ) ) $query .= $matches[4];
 663                                         $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 664                                         if( $query != '' ) $url .= '?' . $query;
 665                                         return $url;
 666                                 }
 667                         }
 668                         if ( $query == '-' ) {
 669                                 $query = '';
 670                         }
 671                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 672                 }
 673                 return $url;
 674         }
 675
 676         /**
 677          * Get an HTML-escaped version of the URL form, suitable for
 678          * using in a link, without a server name or fragment
 679          * @param string $query an optional query string
 680          * @return string the URL
 681          * @access public
 682          */
 683         function escapeLocalURL( $query = '' ) {
 684                 return htmlspecialchars( $this->getLocalURL( $query ) );
 685         }
 686
 687         /**
 688          * Get an HTML-escaped version of the URL form, suitable for
 689          * using in a link, including the server name and fragment
 690          *
 691          * @return string the URL
 692          * @param string $query an optional query string
 693          * @access public
 694          */
 695         function escapeFullURL( $query = '' ) {
 696                 return htmlspecialchars( $this->getFullURL( $query ) );
 697         }
 698
 699         /**
 700          * Get the URL form for an internal link.
 701          * - Used in various Squid-related code, in case we have a different
 702          * internal hostname for the server from the exposed one.
 703          *
 704          * @param string $query an optional query string
 705          * @return string the URL
 706          * @access public
 707          */
 708         function getInternalURL( $query = '' ) {
 709                 global $wgInternalServer;
 710                 return $wgInternalServer . $this->getLocalURL( $query );
 711         }
 712
 713         /**
 714          * Get the edit URL for this Title
 715          * @return string the URL, or a null string if this is an
 716          *      interwiki link
 717          * @access public
 718          */
 719         function getEditURL() {
 720                 global $wgServer, $wgScript;
 721
 722                 if ( '' != $this->mInterwiki ) { return ''; }
 723                 $s = $this->getLocalURL( 'action=edit' );
 724
 725                 return $s;
 726         }
 727
 728         /**
 729          * Get the HTML-escaped displayable text form.
 730          * Used for the title field in <a> tags.
 731          * @return string the text, including any prefixes
 732          * @access public
 733          */
 734         function getEscapedText() {
 735                 return htmlspecialchars( $this->getPrefixedText() );
 736         }
 737
 738         /**
 739          * Is this Title interwiki?
 740          * @return boolean
 741          * @access public
 742          */
 743         function isExternal() { return ( '' != $this->mInterwiki ); }
 744
 745         /**
 746          * Does the title correspond to a protected article?
 747          * @param string $what the action the page is protected from,
 748          *      by default checks move and edit
 749          * @return boolean
 750          * @access public
 751          */
 752         function isProtected($action = '') {
 753                 if ( -1 == $this->mNamespace ) { return true; }
 754                 if($action == 'edit' || $action == '') {
 755                         $a = $this->getRestrictions("edit");
 756                         if ( in_array( 'sysop', $a ) ) { return true; }
 757                 }
 758                 if($action == 'move' || $action == '') {
 759                         $a = $this->getRestrictions("move");
 760                         if ( in_array( 'sysop', $a ) ) { return true; }
 761                 }
 762                 return false;
 763         }
 764
 765         /**
 766          * Is $wgUser is watching this page?
 767          * @return boolean
 768          * @access public
 769          */
 770         function userIsWatching() {
 771                 global $wgUser;
 772
 773                 if ( -1 == $this->mNamespace ) { return false; }
 774                 if ( 0 == $wgUser->getID() ) { return false; }
 775
 776                 return $wgUser->isWatched( $this );
 777         }
 778
 779         /**
 780          * Is $wgUser perform $action this page?
 781          * @param string $action action that permission needs to be checked for
 782          * @return boolean
 783          * @access private
 784          */
 785         function userCan($action) {
 786                 $fname = 'Title::userCanEdit';
 787                 wfProfileIn( $fname );
 788
 789                 global $wgUser;
 790                 if( NS_SPECIAL == $this->mNamespace ) {
 791                         wfProfileOut( $fname );
 792                         return false;
 793                 }
 794                 if( NS_MEDIAWIKI == $this->mNamespace &&
 795                     !$wgUser->isAllowed('editinterface') ) {
 796                         wfProfileOut( $fname );
 797                         return false;
 798                 }
 799                 if( $this->mDbkeyform == '_' ) {
 800                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
 801                         wfProfileOut( $fname );
 802                         return false;
 803                 }
 804
 805                 # protect global styles and js
 806                 if ( NS_MEDIAWIKI == $this->mNamespace
 807                  && preg_match("/\\.(css|js)$/", $this->mTextform )
 808                      && !$wgUser->isAllowed('editinterface') ) {
 809                         wfProfileOut( $fname );
 810                         return false;
 811                 }
 812
 813                 # protect css/js subpages of user pages
 814                 # XXX: this might be better using restrictions
 815                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
 816                 if( NS_USER == $this->mNamespace
 817                         && preg_match("/\\.(css|js)$/", $this->mTextform )
 818                         && !$wgUser->isAllowed('editinterface')
 819                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
 820                         wfProfileOut( $fname );
 821                         return false;
 822                 }
 823
 824                 foreach( $this->getRestrictions($action) as $right ) {
 825                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
 826                                 wfProfileOut( $fname );
 827                                 return false;
 828                         }
 829                 }
 830                 wfProfileOut( $fname );
 831                 return true;
 832         }
 833
 834         /**
 835          * Can $wgUser edit this page?
 836          * @return boolean
 837          * @access public
 838          */
 839         function userCanEdit() {
 840                 return $this->userCan('edit');
 841         }
 842
 843         /**
 844          * Can $wgUser move this page?
 845          * @return boolean
 846          * @access public
 847          */
 848         function userCanMove() {
 849                 return $this->userCan('move');
 850         }
 851
 852         /**
 853          * Can $wgUser read this page?
 854          * @return boolean
 855          * @access public
 856          */
 857         function userCanRead() {
 858                 global $wgUser;
 859
 860                 if( $wgUser->isAllowed('read') ) {
 861                         return true;
 862                 } else {
 863                         global $wgWhitelistRead;
 864
 865                         /** If anon users can create an account,
 866                             they need to reach the login page first! */
 867                         if( $wgUser->isAllowed( 'createaccount' )
 868                             && $this->mId == NS_SPECIAL
 869                             && $this->getText() == 'Userlogin' ) {
 870                                 return true;
 871                         }
 872
 873                         /** some pages are explicitly allowed */
 874                         $name = $this->getPrefixedText();
 875                         if( in_array( $name, $wgWhitelistRead ) ) {
 876                                 return true;
 877                         }
 878
 879                         # Compatibility with old settings
 880                         if( $this->getNamespace() == NS_MAIN ) {
 881                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
 882                                         return true;
 883                                 }
 884                         }
 885                 }
 886                 return false;
 887         }
 888
 889         /**
 890          * Is this a talk page of some sort?
 891          * @return bool
 892          * @access public
 893          */
 894         function isTalkPage() {
 895                 return Namespace::isTalk( $this->getNamespace() );
 896         }
 897
 898         /**
 899          * Is this a .css or .js subpage of a user page?
 900          * @return bool
 901          * @access public
 902          */
 903         function isCssJsSubpage() {
 904                 return ( NS_USER == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
 905         }
 906         /**
 907          * Is this a .css subpage of a user page?
 908          * @return bool
 909          * @access public
 910          */
 911         function isCssSubpage() {
 912                 return ( NS_USER == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
 913         }
 914         /**
 915          * Is this a .js subpage of a user page?
 916          * @return bool
 917          * @access public
 918          */
 919         function isJsSubpage() {
 920                 return ( NS_USER == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
 921         }
 922         /**
 923          * Protect css/js subpages of user pages: can $wgUser edit
 924          * this page?
 925          *
 926          * @return boolean
 927          * @todo XXX: this might be better using restrictions
 928          * @access public
 929          */
 930         function userCanEditCssJsSubpage() {
 931                 global $wgUser;
 932                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
 933         }
 934
 935         /**
 936          * Loads a string into mRestrictions array
 937          * @param string $res restrictions in string format
 938          * @access public
 939          */
 940         function loadRestrictions( $res ) {
 941                 foreach( explode( ':', trim( $res ) ) as $restrict ) {
 942                         $temp = explode( '=', trim( $restrict ) );
 943                         if(count($temp) == 1) {
 944                                 // old format should be treated as edit/move restriction
 945                                 $this->mRestrictions["edit"] = explode( ',', trim( $temp[0] ) );
 946                                 $this->mRestrictions["move"] = explode( ',', trim( $temp[0] ) );
 947                         } else {
 948                                 $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
 949                         }
 950                 }
 951                 $this->mRestrictionsLoaded = true;
 952         }
 953
 954         /**
 955          * Accessor/initialisation for mRestrictions
 956          * @param string $action action that permission needs to be checked for
 957          * @return array the array of groups allowed to edit this article
 958          * @access public
 959          */
 960         function getRestrictions($action) {
 961                 $id = $this->getArticleID();
 962                 if ( 0 == $id ) { return array(); }
 963
 964                 if ( ! $this->mRestrictionsLoaded ) {
 965                         $dbr =& wfGetDB( DB_SLAVE );
 966                         $res = $dbr->selectField( 'page', 'page_restrictions', 'page_id='.$id );
 967                         $this->loadRestrictions( $res );
 968                 }
 969                 if( isset( $this->mRestrictions[$action] ) ) {
 970                         return $this->mRestrictions[$action];
 971                 }
 972                 return array();
 973         }
 974
 975         /**
 976          * Is there a version of this page in the deletion archive?
 977          * @return int the number of archived revisions
 978          * @access public
 979          */
 980         function isDeleted() {
 981                 $fname = 'Title::isDeleted';
 982                 $dbr =& wfGetDB( DB_SLAVE );
 983                 $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
 984                         'ar_title' => $this->getDBkey() ), $fname );
 985                 return (int)$n;
 986         }
 987
 988         /**
 989          * Get the article ID for this Title from the link cache,
 990          * adding it if necessary
 991          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
 992          *      for update
 993          * @return int the ID
 994          * @access public
 995          */
 996         function getArticleID( $flags = 0 ) {
 997                 global $wgLinkCache;
 998
 999                 if ( $flags & GAID_FOR_UPDATE ) {
1000                         $oldUpdate = $wgLinkCache->forUpdate( true );
1001                         $this->mArticleID = $wgLinkCache->addLinkObj( $this );
1002                         $wgLinkCache->forUpdate( $oldUpdate );
1003                 } else {
1004                         if ( -1 == $this->mArticleID ) {
1005                                 $this->mArticleID = $wgLinkCache->addLinkObj( $this );
1006                         }
1007                 }
1008                 return $this->mArticleID;
1009         }
1010
1011         /**
1012          * This clears some fields in this object, and clears any associated
1013          * keys in the "bad links" section of $wgLinkCache.
1014          *
1015          * - This is called from Article::insertNewArticle() to allow
1016          * loading of the new page_id. It's also called from
1017          * Article::doDeleteArticle()
1018          *
1019          * @param int $newid the new Article ID
1020          * @access public
1021          */
1022         function resetArticleID( $newid ) {
1023                 global $wgLinkCache;
1024                 $wgLinkCache->clearBadLink( $this->getPrefixedDBkey() );
1025
1026                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1027                 else { $this->mArticleID = $newid; }
1028                 $this->mRestrictionsLoaded = false;
1029                 $this->mRestrictions = array();
1030         }
1031
1032         /**
1033          * Updates page_touched for this page; called from LinksUpdate.php
1034          * @return bool true if the update succeded
1035          * @access public
1036          */
1037         function invalidateCache() {
1038                 $now = wfTimestampNow();
1039                 $dbw =& wfGetDB( DB_MASTER );
1040                 $success = $dbw->update( 'page',
1041                         array( /* SET */
1042                                 'page_touched' => $dbw->timestamp()
1043                         ), array( /* WHERE */
1044                                 'page_namespace' => $this->getNamespace() ,
1045                                 'page_title' => $this->getDBkey()
1046                         ), 'Title::invalidateCache'
1047                 );
1048                 return $success;
1049         }
1050
1051         /**
1052          * Prefix some arbitrary text with the namespace or interwiki prefix
1053          * of this object
1054          *
1055          * @param string $name the text
1056          * @return string the prefixed text
1057          * @access private
1058          */
1059         /* private */ function prefix( $name ) {
1060                 global $wgContLang;
1061
1062                 $p = '';
1063                 if ( '' != $this->mInterwiki ) {
1064                         $p = $this->mInterwiki . ':';
1065                 }
1066                 if ( 0 != $this->mNamespace ) {
1067                         $p .= $wgContLang->getNsText( $this->mNamespace ) . ':';
1068                 }
1069                 return $p . $name;
1070         }
1071
1072         /**
1073          * Secure and split - main initialisation function for this object
1074          *
1075          * Assumes that mDbkeyform has been set, and is urldecoded
1076          * and uses underscores, but not otherwise munged.  This function
1077          * removes illegal characters, splits off the interwiki and
1078          * namespace prefixes, sets the other forms, and canonicalizes
1079          * everything.
1080          * @return bool true on success
1081          * @access private
1082          */
1083         /* private */ function secureAndSplit() {
1084                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1085                 $fname = 'Title::secureAndSplit';
1086                 wfProfileIn( $fname );
1087
1088                 # Initialisation
1089                 static $rxTc = false;
1090                 if( !$rxTc ) {
1091                         # % is needed as well
1092                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/S';
1093                 }
1094
1095                 $this->mInterwiki = $this->mFragment = '';
1096                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1097
1098                 # Clean up whitespace
1099                 #
1100                 $t = preg_replace( '/[ _]+/', '_', $this->mDbkeyform );
1101                 $t = trim( $t, '_' );
1102
1103                 if ( '' == $t ) {
1104                         wfProfileOut( $fname );
1105                         return false;
1106                 }
1107
1108                 global $wgUseLatin1;
1109                 if( !$wgUseLatin1 && false !== strpos( $t, UTF8_REPLACEMENT ) ) {
1110                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1111                         wfProfileOut( $fname );
1112                         return false;
1113                 }
1114
1115                 $this->mDbkeyform = $t;
1116
1117                 # Initial colon indicating main namespace
1118                 if ( ':' == $t{0} ) {
1119                         $r = substr( $t, 1 );
1120                         $this->mNamespace = NS_MAIN;
1121                 } else {
1122                         # Namespace or interwiki prefix
1123                         $firstPass = true;
1124                         do {
1125                                 if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $t, $m ) ) {
1126                                         $p = $m[1];
1127                                         $lowerNs = strtolower( $p );
1128                                         if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1129                                                 # Canonical namespace
1130                                                 $t = $m[2];
1131                                                 $this->mNamespace = $ns;
1132                                         } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1133                                                 # Ordinary namespace
1134                                                 $t = $m[2];
1135                                                 $this->mNamespace = $ns;
1136                                         } elseif( $this->getInterwikiLink( $p ) ) {
1137                                                 if( !$firstPass ) {
1138                                                         # Can't make a local interwiki link to an interwiki link.
1139                                                         # That's just crazy!
1140                                                         wfProfileOut( $fname );
1141                                                         return false;
1142                                                 }
1143
1144                                                 # Interwiki link
1145                                                 $t = $m[2];
1146                                                 $this->mInterwiki = $p;
1147
1148                                                 # Redundant interwiki prefix to the local wiki
1149                                                 if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1150                                                         if( $t == '' ) {
1151                                                                 # Can't have an empty self-link
1152                                                                 wfProfileOut( $fname );
1153                                                                 return false;
1154                                                         }
1155                                                         $this->mInterwiki = '';
1156                                                         $firstPass = false;
1157                                                         # Do another namespace split...
1158                                                         continue;
1159                                                 }
1160                                         }
1161                                         # If there's no recognized interwiki or namespace,
1162                                         # then let the colon expression be part of the title.
1163                                 }
1164                                 break;
1165                         } while( true );
1166                         $r = $t;
1167                 }
1168
1169                 # We already know that some pages won't be in the database!
1170                 #
1171                 if ( '' != $this->mInterwiki || -1 == $this->mNamespace ) {
1172                         $this->mArticleID = 0;
1173                 }
1174                 $f = strstr( $r, '#' );
1175                 if ( false !== $f ) {
1176                         $this->mFragment = substr( $f, 1 );
1177                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
1178                         # remove whitespace again: prevents "Foo_bar_#"
1179                         # becoming "Foo_bar_"
1180                         $r = preg_replace( '/_*$/', '', $r );
1181                 }
1182
1183                 # Reject illegal characters.
1184                 #
1185                 if( preg_match( $rxTc, $r ) ) {
1186                         wfProfileOut( $fname );
1187                         return false;
1188                 }
1189
1190                 /**
1191                  * Pages with "/./" or "/../" appearing in the URLs will
1192                  * often be unreachable due to the way web browsers deal
1193                  * with 'relative' URLs. Forbid them explicitly.
1194                  */
1195                 if ( strpos( $r, '.' ) !== false &&
1196                      ( $r === '.' || $r === '..' ||
1197                        strpos( $r, './' ) === 0  ||
1198                        strpos( $r, '../' ) === 0 ||
1199                        strpos( $r, '/./' ) !== false ||
1200                        strpos( $r, '/../' ) !== false ) )
1201                 {
1202                         wfProfileOut( $fname );
1203                         return false;
1204                 }
1205
1206                 # We shouldn't need to query the DB for the size.
1207                 #$maxSize = $dbr->textFieldSize( 'page', 'page_title' );
1208                 if ( strlen( $r ) > 255 ) {
1209                         wfProfileOut( $fname );
1210                         return false;
1211                 }
1212
1213                 /**
1214                  * Normally, all wiki links are forced to have
1215                  * an initial capital letter so [[foo]] and [[Foo]]
1216                  * point to the same place.
1217                  *
1218                  * Don't force it for interwikis, since the other
1219                  * site might be case-sensitive.
1220                  */
1221                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1222                         $t = $wgContLang->ucfirst( $r );
1223                 } else {
1224                         $t = $r;
1225                 }
1226
1227                 /**
1228                  * Can't make a link to a namespace alone...
1229                  * "empty" local links can only be self-links
1230                  * with a fragment identifier.
1231                  */
1232                 if( $t == '' &&
1233                         $this->mInterwiki == '' &&
1234                         $this->mNamespace != NS_MAIN ) {
1235                         wfProfileOut( $fname );
1236                         return false;
1237                 }
1238
1239                 if( $wgUseLatin1 && $this->mInterwiki != '' ) {
1240                         # On a Latin-1 wiki, numbered character entities may have
1241                         # left us with a mix of 8-bit and UTF-8 characters, and
1242                         # some of those might be Windows-1252 special chars.
1243                         # Normalize interwikis to pure UTF-8.
1244                         $t = Title::mergeLatin1Utf8( $t );
1245                 }
1246
1247                 # Fill fields
1248                 $this->mDbkeyform = $t;
1249                 $this->mUrlform = wfUrlencode( $t );
1250
1251                 $this->mTextform = str_replace( '_', ' ', $t );
1252
1253                 wfProfileOut( $fname );
1254                 return true;
1255         }
1256
1257         /**
1258          * Get a Title object associated with the talk page of this article
1259          * @return Title the object for the talk page
1260          * @access public
1261          */
1262         function getTalkPage() {
1263                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1264         }
1265
1266         /**
1267          * Get a title object associated with the subject page of this
1268          * talk page
1269          *
1270          * @return Title the object for the subject page
1271          * @access public
1272          */
1273         function getSubjectPage() {
1274                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1275         }
1276
1277         /**
1278          * Get an array of Title objects linking to this Title
1279          * - Also stores the IDs in the link cache.
1280          *
1281          * @param string $options may be FOR UPDATE
1282          * @return array the Title objects linking here
1283          * @access public
1284          */
1285         function getLinksTo( $options = '' ) {
1286                 global $wgLinkCache;
1287                 $id = $this->getArticleID();
1288
1289                 if ( $options ) {
1290                         $db =& wfGetDB( DB_MASTER );
1291                 } else {
1292                         $db =& wfGetDB( DB_SLAVE );
1293                 }
1294                 $page = $db->tableName( 'page' );
1295                 $links = $db->tableName( 'links' );
1296
1297                 $sql = "SELECT page_namespace,page_title,page_id FROM $page,$links WHERE l_from=page_id AND l_to={$id} $options";
1298                 $res = $db->query( $sql, 'Title::getLinksTo' );
1299                 $retVal = array();
1300                 if ( $db->numRows( $res ) ) {
1301                         while ( $row = $db->fetchObject( $res ) ) {
1302                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1303                                         $wgLinkCache->addGoodLink( $row->page_id, $titleObj->getPrefixedDBkey() );
1304                                         $retVal[] = $titleObj;
1305                                 }
1306                         }
1307                 }
1308                 $db->freeResult( $res );
1309                 return $retVal;
1310         }
1311
1312         /**
1313          * Get an array of Title objects linking to this non-existent title.
1314          * - Also stores the IDs in the link cache.
1315          *
1316          * @param string $options may be FOR UPDATE
1317          * @return array the Title objects linking here
1318          * @access public
1319          */
1320         function getBrokenLinksTo( $options = '' ) {
1321                 global $wgLinkCache;
1322
1323                 if ( $options ) {
1324                         $db =& wfGetDB( DB_MASTER );
1325                 } else {
1326                         $db =& wfGetDB( DB_SLAVE );
1327                 }
1328                 $page = $db->tableName( 'page' );
1329                 $brokenlinks = $db->tableName( 'brokenlinks' );
1330                 $encTitle = $db->strencode( $this->getPrefixedDBkey() );
1331
1332                 $sql = "SELECT page_namespace,page_title,page_id FROM $brokenlinks,$page " .
1333                   "WHERE bl_from=page_id AND bl_to='$encTitle' $options";
1334                 $res = $db->query( $sql, "Title::getBrokenLinksTo" );
1335                 $retVal = array();
1336                 if ( $db->numRows( $res ) ) {
1337                         while ( $row = $db->fetchObject( $res ) ) {
1338                                 $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title );
1339                                 $wgLinkCache->addGoodLink( $row->page_id, $titleObj->getPrefixedDBkey() );
1340                                 $retVal[] = $titleObj;
1341                         }
1342                 }
1343                 $db->freeResult( $res );
1344                 return $retVal;
1345         }
1346
1347         /**
1348          * Get a list of URLs to purge from the Squid cache when this
1349          * page changes
1350          *
1351          * @return array the URLs
1352          * @access public
1353          */
1354         function getSquidURLs() {
1355                 return array(
1356                         $this->getInternalURL(),
1357                         $this->getInternalURL( 'action=history' )
1358                 );
1359         }
1360
1361         /**
1362          * Move this page without authentication
1363          * @param Title &$nt the new page Title
1364          * @access public
1365          */
1366         function moveNoAuth( &$nt ) {
1367                 return $this->moveTo( $nt, false );
1368         }
1369
1370         /**
1371          * Move a title to a new location
1372          * @param Title &$nt the new title
1373          * @param bool $auth indicates whether $wgUser's permissions
1374          *      should be checked
1375          * @return mixed true on success, message name on failure
1376          * @access public
1377          */
1378         function moveTo( &$nt, $auth = true ) {
1379                 global $wgUser;
1380                 if( !$this or !$nt ) {
1381                         return 'badtitletext';
1382                 }
1383
1384                 $fname = 'Title::move';
1385                 $oldid = $this->getArticleID();
1386                 $newid = $nt->getArticleID();
1387
1388                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1389                         return 'articleexists';
1390                 }
1391                 if ( ( ! Namespace::isMovable( $this->getNamespace() ) ) ||
1392                          ( '' == $this->getDBkey() ) ||
1393                          ( '' != $this->getInterwiki() ) ||
1394                          ( !$oldid ) ||
1395                      ( ! Namespace::isMovable( $nt->getNamespace() ) ) ||
1396                          ( '' == $nt->getDBkey() ) ||
1397                          ( '' != $nt->getInterwiki() ) ) {
1398                         return 'badarticleerror';
1399                 }
1400
1401                 if ( $auth && (
1402                                 !$this->userCanEdit() || !$nt->userCanEdit() ||
1403                                 !$this->userCanMove() || !$nt->userCanMove() ) ) {
1404                         return 'protectedpage';
1405                 }
1406
1407                 # The move is allowed only if (1) the target doesn't exist, or
1408                 # (2) the target is a redirect to the source, and has no history
1409                 # (so we can undo bad moves right after they're done).
1410
1411                 if ( 0 != $newid ) { # Target exists; check for validity
1412                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1413                                 return 'articleexists';
1414                         }
1415                         $this->moveOverExistingRedirect( $nt );
1416                 } else { # Target didn't exist, do normal move.
1417                         $this->moveToNewTitle( $nt, $newid );
1418                 }
1419
1420                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
1421
1422                 $dbw =& wfGetDB( DB_MASTER );
1423                 $categorylinks = $dbw->tableName( 'categorylinks' );
1424                 $sql = "UPDATE $categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
1425                         " WHERE cl_from=" . $dbw->addQuotes( $this->getArticleID() ) .
1426                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
1427                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
1428
1429                 # Update watchlists
1430
1431                 $oldnamespace = $this->getNamespace() & ~1;
1432                 $newnamespace = $nt->getNamespace() & ~1;
1433                 $oldtitle = $this->getDBkey();
1434                 $newtitle = $nt->getDBkey();
1435
1436                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
1437                         WatchedItem::duplicateEntries( $this, $nt );
1438                 }
1439
1440                 # Update search engine
1441                 $u = new SearchUpdate( $oldid, $nt->getPrefixedDBkey() );
1442                 $u->doUpdate();
1443                 $u = new SearchUpdate( $newid, $this->getPrefixedDBkey(), '' );
1444                 $u->doUpdate();
1445
1446                 wfRunHooks( 'TitleMoveComplete', array(&$this, &$nt, &$wgUser, $oldid, $newid) );
1447                 return true;
1448         }
1449
1450         /**
1451          * Move page to a title which is at present a redirect to the
1452          * source page
1453          *
1454          * @param Title &$nt the page to move to, which should currently
1455          *      be a redirect
1456          * @access private
1457          */
1458         /* private */ function moveOverExistingRedirect( &$nt ) {
1459                 global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
1460                 $fname = 'Title::moveOverExistingRedirect';
1461                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1462
1463                 $now = wfTimestampNow();
1464                 $rand = wfRandom();
1465                 $newid = $nt->getArticleID();
1466                 $oldid = $this->getArticleID();
1467                 $dbw =& wfGetDB( DB_MASTER );
1468                 $links = $dbw->tableName( 'links' );
1469
1470                 # Delete the old redirect. We don't save it to history since
1471                 # by definition if we've got here it's rather uninteresting.
1472                 # We have to remove it so that the next step doesn't trigger
1473                 # a conflict on the unique namespace+title index...
1474                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
1475
1476                 # Change the name of the target page:
1477                 $dbw->update( 'page',
1478                         /* SET */ array(
1479                                 'page_touched' => $dbw->timestamp($now),
1480                                 'page_namespace' => $nt->getNamespace(),
1481                                 'page_title' => $nt->getDBkey()
1482                         ),
1483                         /* WHERE */ array( 'page_id' => $oldid ),
1484                         $fname
1485                 );
1486                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1487
1488                 # Recreate the redirect, this time in the other direction.
1489                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1490                 $redirectArticle = new Article( $this );
1491                 $newid = $redirectArticle->insertOn( $dbw );
1492                 $redirectRevision = new Revision( array(
1493                         'page'    => $newid,
1494                         'comment' => $comment,
1495                         'text'    => $redirectText ) );
1496                 $revid = $redirectRevision->insertOn( $dbw );
1497                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1498                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1499
1500                 # Record in RC
1501                 // Replaced by a log entry
1502                 // RecentChange::notifyMoveOverRedirect( $now, $this, $nt, $wgUser, $comment );
1503
1504                 # Log the move
1505                 $log = new LogPage( 'move' );
1506                 $log->addEntry( 'move_redir', $this, '', array(1 => $nt->getText()) );
1507
1508                 # Swap links
1509
1510                 # Load titles and IDs
1511                 $linksToOld = $this->getLinksTo( 'FOR UPDATE' );
1512                 $linksToNew = $nt->getLinksTo( 'FOR UPDATE' );
1513
1514                 # Delete them all
1515                 $sql = "DELETE FROM $links WHERE l_to=$oldid OR l_to=$newid";
1516                 $dbw->query( $sql, $fname );
1517
1518                 # Reinsert
1519                 if ( count( $linksToOld ) || count( $linksToNew )) {
1520                         $sql = "INSERT INTO $links (l_from,l_to) VALUES ";
1521                         $first = true;
1522
1523                         # Insert links to old title
1524                         foreach ( $linksToOld as $linkTitle ) {
1525                                 if ( $first ) {
1526                                         $first = false;
1527                                 } else {
1528                                         $sql .= ',';
1529                                 }
1530                                 $id = $linkTitle->getArticleID();
1531                                 $sql .= "($id,$newid)";
1532                         }
1533
1534                         # Insert links to new title
1535                         foreach ( $linksToNew as $linkTitle ) {
1536                                 if ( $first ) {
1537                                         $first = false;
1538                                 } else {
1539                                         $sql .= ',';
1540                                 }
1541                                 $id = $linkTitle->getArticleID();
1542                                 $sql .= "($id, $oldid)";
1543                         }
1544
1545                         $dbw->query( $sql, DB_MASTER, $fname );
1546                 }
1547
1548                 # Now, we record the link from the redirect to the new title.
1549                 # It should have no other outgoing links...
1550                 $dbw->delete( 'links', array( 'l_from' => $newid ) );
1551                 $dbw->insert( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ) );
1552
1553                 # Clear linkscc
1554                 LinkCache::linksccClearLinksTo( $oldid );
1555                 LinkCache::linksccClearLinksTo( $newid );
1556
1557                 # Purge squid
1558                 if ( $wgUseSquid ) {
1559                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1560                         $u = new SquidUpdate( $urls );
1561                         $u->doUpdate();
1562                 }
1563         }
1564
1565         /**
1566          * Move page to non-existing title.
1567          * @param Title &$nt the new Title
1568          * @param int &$newid set to be the new article ID
1569          * @access private
1570          */
1571         /* private */ function moveToNewTitle( &$nt, &$newid ) {
1572                 global $wgUser, $wgLinkCache, $wgUseSquid;
1573                 global $wgMwRedir;
1574                 $fname = 'MovePageForm::moveToNewTitle';
1575                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1576
1577                 $newid = $nt->getArticleID();
1578                 $oldid = $this->getArticleID();
1579                 $dbw =& wfGetDB( DB_MASTER );
1580                 $now = $dbw->timestamp();
1581                 wfSeedRandom();
1582                 $rand = wfRandom();
1583
1584                 # Rename cur entry
1585                 $dbw->update( 'page',
1586                         /* SET */ array(
1587                                 'page_touched' => $now,
1588                                 'page_namespace' => $nt->getNamespace(),
1589                                 'page_title' => $nt->getDBkey()
1590                         ),
1591                         /* WHERE */ array( 'page_id' => $oldid ),
1592                         $fname
1593                 );
1594
1595                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1596
1597                 # Insert redirect
1598                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1599                 $redirectArticle = new Article( $this );
1600                 $newid = $redirectArticle->insertOn( $dbw );
1601                 $redirectRevision = new Revision( array(
1602                         'page'    => $newid,
1603                         'comment' => $comment,
1604                         'text'    => $redirectText ) );
1605                 $revid = $redirectRevision->insertOn( $dbw );
1606                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1607                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1608
1609                 # Record in RC
1610                 // Replaced by a log entry
1611                 // RecentChange::notifyMoveToNew( $now, $this, $nt, $wgUser, $comment );
1612
1613                 # Log the move
1614                 $log = new LogPage( 'move' );
1615                 $log->addEntry( 'move', $this, '', array(1 => $nt->getText()) );
1616
1617                 # Purge squid and linkscc as per article creation
1618                 Article::onArticleCreate( $nt );
1619
1620                 # Any text links to the old title must be reassigned to the redirect
1621                 $dbw->update( 'links', array( 'l_to' => $newid ), array( 'l_to' => $oldid ), $fname );
1622                 LinkCache::linksccClearLinksTo( $oldid );
1623
1624                 # Record the just-created redirect's linking to the page
1625                 $dbw->insert( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ), $fname );
1626
1627                 # Non-existent target may have had broken links to it; these must
1628                 # now be removed and made into good links.
1629                 $update = new LinksUpdate( $oldid, $nt->getPrefixedDBkey() );
1630                 $update->fixBrokenLinks();
1631
1632                 # Purge old title from squid
1633                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1634                 $titles = $nt->getLinksTo();
1635                 if ( $wgUseSquid ) {
1636                         $urls = $this->getSquidURLs();
1637                         foreach ( $titles as $linkTitle ) {
1638                                 $urls[] = $linkTitle->getInternalURL();
1639                         }
1640                         $u = new SquidUpdate( $urls );
1641                         $u->doUpdate();
1642                 }
1643         }
1644
1645         /**
1646          * Checks if $this can be moved to a given Title
1647          * - Selects for update, so don't call it unless you mean business
1648          *
1649          * @param Title &$nt the new title to check
1650          * @access public
1651          */
1652         function isValidMoveTarget( $nt ) {
1653
1654                 $fname = 'Title::isValidMoveTarget';
1655                 $dbw =& wfGetDB( DB_MASTER );
1656
1657                 # Is it a redirect?
1658                 $id  = $nt->getArticleID();
1659                 $obj = $dbw->selectRow( array( 'page', 'text') ,
1660                         array( 'page_is_redirect','old_text' ),
1661                         array( 'page_id' => $id, 'page_latest=old_id' ),
1662                         $fname, 'FOR UPDATE' );
1663
1664                 if ( !$obj || 0 == $obj->page_is_redirect ) {
1665                         # Not a redirect
1666                         return false;
1667                 }
1668
1669                 # Does the redirect point to the source?
1670                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $obj->old_text, $m ) ) {
1671                         $redirTitle = Title::newFromText( $m[1] );
1672                         if( !is_object( $redirTitle ) ||
1673                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1674                                 return false;
1675                         }
1676                 }
1677
1678                 # Does the article have a history?
1679                 $row = $dbw->selectRow( array( 'page', 'revision'),
1680                         array( 'rev_id' ),
1681                         array( 'page_namespace' => $nt->getNamespace(),
1682                                 'page_title' => $nt->getDBkey(),
1683                                 'page_id=rev_page AND page_latest != rev_id'
1684                         ), $fname, 'FOR UPDATE'
1685                 );
1686
1687                 # Return true if there was no history
1688                 return $row === false;
1689         }
1690
1691         /**
1692          * Create a redirect; fails if the title already exists; does
1693          * not notify RC
1694          *
1695          * @param Title $dest the destination of the redirect
1696          * @param string $comment the comment string describing the move
1697          * @return bool true on success
1698          * @access public
1699          */
1700         function createRedirect( $dest, $comment ) {
1701                 global $wgUser;
1702                 if ( $this->getArticleID() ) {
1703                         return false;
1704                 }
1705
1706                 $fname = 'Title::createRedirect';
1707                 $dbw =& wfGetDB( DB_MASTER );
1708
1709                 $article = new Article( $this );
1710                 $newid = $article->insertOn( $dbw );
1711                 $revision = new Revision( array(
1712                         'page'      => $newid,
1713                         'comment'   => $comment,
1714                         'text'      => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n",
1715                         ) );
1716                 $revisionId = $revision->insertOn( $dbw );
1717                 $article->updateRevisionOn( $dbw, $revision, 0 );
1718
1719                 # Link table
1720                 if ( $dest->getArticleID() ) {
1721                         $dbw->insert( 'links',
1722                                 array(
1723                                         'l_to' => $dest->getArticleID(),
1724                                         'l_from' => $newid
1725                                 ), $fname
1726                         );
1727                 } else {
1728                         $dbw->insert( 'brokenlinks',
1729                                 array(
1730                                         'bl_to' => $dest->getPrefixedDBkey(),
1731                                         'bl_from' => $newid
1732                                 ), $fname
1733                         );
1734                 }
1735
1736                 Article::onArticleCreate( $this );
1737                 return true;
1738         }
1739
1740         /**
1741          * Get categories to which this Title belongs and return an array of
1742          * categories' names.
1743          *
1744          * @return array an array of parents in the form:
1745          *      $parent => $currentarticle
1746          * @access public
1747          */
1748         function getParentCategories() {
1749                 global $wgContLang,$wgUser;
1750
1751                 $titlekey = $this->getArticleId();
1752                 $sk =& $wgUser->getSkin();
1753                 $parents = array();
1754                 $dbr =& wfGetDB( DB_SLAVE );
1755                 $categorylinks = $dbr->tableName( 'categorylinks' );
1756
1757                 # NEW SQL
1758                 $sql = "SELECT * FROM $categorylinks"
1759                      ." WHERE cl_from='$titlekey'"
1760                          ." AND cl_from <> '0'"
1761                          ." ORDER BY cl_sortkey";
1762
1763                 $res = $dbr->query ( $sql ) ;
1764
1765                 if($dbr->numRows($res) > 0) {
1766                         while ( $x = $dbr->fetchObject ( $res ) )
1767                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
1768                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
1769                         $dbr->freeResult ( $res ) ;
1770                 } else {
1771                         $data = '';
1772                 }
1773                 return $data;
1774         }
1775
1776         /**
1777          * Get a tree of parent categories
1778          * @param array $children an array with the children in the keys, to check for circular refs
1779          * @return array
1780          * @access public
1781          */
1782         function getParentCategoryTree( $children = array() ) {
1783                 $parents = $this->getParentCategories();
1784
1785                 if($parents != '') {
1786                         foreach($parents as $parent => $current)
1787                         {
1788                                 if ( array_key_exists( $parent, $children ) ) {
1789                                         # Circular reference
1790                                         $stack[$parent] = array();
1791                                 } else {
1792                                         $nt = Title::newFromText($parent);
1793                                         $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
1794                                 }
1795                         }
1796                         return $stack;
1797                 } else {
1798                         return array();
1799                 }
1800         }
1801
1802
1803         /**
1804          * Get an associative array for selecting this title from
1805          * the "cur" table
1806          *
1807          * @return array
1808          * @access public
1809          */
1810         function curCond() {
1811                 wfDebugDieBacktrace( 'curCond called' );
1812                 return array( 'cur_namespace' => $this->mNamespace, 'cur_title' => $this->mDbkeyform );
1813         }
1814
1815         /**
1816          * Get an associative array for selecting this title from the
1817          * "old" table
1818          *
1819          * @return array
1820          * @access public
1821          */
1822         function oldCond() {
1823                 wfDebugDieBacktrace( 'oldCond called' );
1824                 return array( 'old_namespace' => $this->mNamespace, 'old_title' => $this->mDbkeyform );
1825         }
1826
1827         /**
1828          * Get the revision ID of the previous revision
1829          *
1830          * @param integer $revision  Revision ID. Get the revision that was before this one.
1831          * @return interger $oldrevision|false
1832          */
1833         function getPreviousRevisionID( $revision ) {
1834                 $dbr =& wfGetDB( DB_SLAVE );
1835                 return $dbr->selectField( 'revision', 'rev_id',
1836                         'rev_page=' . IntVal( $this->getArticleId() ) .
1837                         ' AND rev_id<' . IntVal( $revision ) . ' ORDER BY rev_id DESC' );
1838         }
1839
1840         /**
1841          * Get the revision ID of the next revision
1842          *
1843          * @param integer $revision  Revision ID. Get the revision that was after this one.
1844          * @return interger $oldrevision|false
1845          */
1846         function getNextRevisionID( $revision ) {
1847                 $dbr =& wfGetDB( DB_SLAVE );
1848                 return $dbr->selectField( 'revision', 'rev_id',
1849                         'rev_page=' . IntVal( $this->getArticleId() ) .
1850                         ' AND rev_id>' . IntVal( $revision ) . ' ORDER BY rev_id' );
1851         }
1852
1853         /**
1854          * Compare with another title.
1855          *
1856          * @param Title $title
1857          * @return bool
1858          */
1859         function equals( &$title ) {
1860                 return $this->getInterwiki() == $title->getInterwiki()
1861                         && $this->getNamespace() == $title->getNamespace()
1862                         && $this->getDbkey() == $title->getDbkey();
1863         }
1864
1865         /**
1866          * Convert Windows-1252 extended codepoints to their real Unicode points.
1867          * @param int $codepoint
1868          * @return int
1869          * @access private
1870          */
1871         function cp1252toUnicode( $codepoint ) {
1872                 # Mappings from:
1873                 # http://www.unicode.org/Public/MAPPINGS/VENDORS/MICSFT/WINDOWS/CP1252.TXT
1874                 static $cp1252 = array(
1875                         0x80 => 0x20AC, #EURO SIGN
1876                         0x81 => UNICODE_REPLACEMENT,
1877                         0x82 => 0x201A, #SINGLE LOW-9 QUOTATION MARK
1878                         0x83 => 0x0192, #LATIN SMALL LETTER F WITH HOOK
1879                         0x84 => 0x201E, #DOUBLE LOW-9 QUOTATION MARK
1880                         0x85 => 0x2026, #HORIZONTAL ELLIPSIS
1881                         0x86 => 0x2020, #DAGGER
1882                         0x87 => 0x2021, #DOUBLE DAGGER
1883                         0x88 => 0x02C6, #MODIFIER LETTER CIRCUMFLEX ACCENT
1884                         0x89 => 0x2030, #PER MILLE SIGN
1885                         0x8A => 0x0160, #LATIN CAPITAL LETTER S WITH CARON
1886                         0x8B => 0x2039, #SINGLE LEFT-POINTING ANGLE QUOTATION MARK
1887                         0x8C => 0x0152, #LATIN CAPITAL LIGATURE OE
1888                         0x8D => UNICODE_REPLACEMENT,
1889                         0x8E => 0x017D, #LATIN CAPITAL LETTER Z WITH CARON
1890                         0x8F => UNICODE_REPLACEMENT,
1891                         0x90 => UNICODE_REPLACEMENT,
1892                         0x91 => 0x2018, #LEFT SINGLE QUOTATION MARK
1893                         0x92 => 0x2019, #RIGHT SINGLE QUOTATION MARK
1894                         0x93 => 0x201C, #LEFT DOUBLE QUOTATION MARK
1895                         0x94 => 0x201D, #RIGHT DOUBLE QUOTATION MARK
1896                         0x95 => 0x2022, #BULLET
1897                         0x96 => 0x2013, #EN DASH
1898                         0x97 => 0x2014, #EM DASH
1899                         0x98 => 0x02DC, #SMALL TILDE
1900                         0x99 => 0x2122, #TRADE MARK SIGN
1901                         0x9A => 0x0161, #LATIN SMALL LETTER S WITH CARON
1902                         0x9B => 0x203A, #SINGLE RIGHT-POINTING ANGLE QUOTATION MARK
1903                         0x9C => 0x0153, #LATIN SMALL LIGATURE OE
1904                         0x9D => UNICODE_REPLACEMENT,
1905                         0x9E => 0x017E, #LATIN SMALL LETTER Z WITH CARON
1906                         0x9F => 0x0178, #LATIN CAPITAL LETTER Y WITH DIAERESIS
1907                         );
1908                 return isset( $cp1252[$codepoint] )
1909                         ? $cp1252[$codepoint]
1910                         : $codepoint;
1911         }
1912
1913         /**
1914          * HACKHACKHACK
1915          * Take a string containing a mix of CP1252 characters and UTF-8 and try
1916          * to convert it completely to UTF-8.
1917          *
1918          * @param string $string
1919          * @return string
1920          * @access private
1921          */
1922         function mergeLatin1Utf8( $string ) {
1923                 return preg_replace_callback(
1924                         # Windows CP1252 extends ISO-8859-1 by putting extra characters
1925                         # into the high control chars area. We have to convert these
1926                         # to their proper Unicode counterparts.
1927                         '/([\x80-\x9f])/u',
1928                         create_function( '$matches',
1929                                 'return codepointToUtf8(
1930                                         Title::cp1252toUnicode(
1931                                                 utf8ToCodepoint( $matches[1] ) ) );' ),
1932                         preg_replace_callback(
1933                                 # Up-convert everything from 8-bit to UTF-8, then
1934                                 # filter the valid-looking UTF-8 back from the
1935                                 # double-converted form.
1936                                 '/((?:[\xc0-\xdf][\x80-\xbf]
1937                                          |[\xe0-\xef][\x80-\xbf]{2}
1938                                          |[\xf0-\xf7][\x80-\xbf]{3})+)/ux',
1939                                 create_function( '$matches',
1940                                         'return utf8_decode( $matches[1] );' ),
1941                                 utf8_encode( $string ) ) );
1942         }
1943
1944 }
1945 ?>