includes/Title.php

   1 <?php
   2 /**
   3  * See title.txt
   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, $wgServer, $wgScript;
 620
 621                 if ( '' == $this->mInterwiki ) {
 622                         return $wgServer . $this->getLocalUrl( $query );
 623                 } else {
 624                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 625                         $namespace = $wgContLang->getNsText( $this->mNamespace );
 626                         if ( '' != $namespace ) {
 627                                 # Can this actually happen? Interwikis shouldn't be parsed.
 628                                 $namepace .= ':';
 629                         }
 630                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 631                         if( $query != '' ) {
 632                                 if( false === strpos( $url, '?' ) ) {
 633                                         $url .= '?';
 634                                 } else {
 635                                         $url .= '&';
 636                                 }
 637                                 $url .= $query;
 638                         }
 639                         if ( '' != $this->mFragment ) {
 640                                 $url .= '#' . $this->mFragment;
 641                         }
 642                         return $url;
 643                 }
 644         }
 645
 646         /**
 647          * Get a relative directory for putting an HTML version of this article into
 648          */
 649         function getHashedDirectory() {
 650                 $dbkey = $this->getPrefixedDBkey();
 651                 if ( strlen( $dbkey ) < 2 ) {
 652                         $dbkey = sprintf( "%2s", $dbkey );
 653                 }
 654                 $dir = '';
 655                 for ( $i=0; $i<=1; $i++ ) {
 656                         if ( $i ) {
 657                                 $dir .= '/';
 658                         }
 659                         if ( ord( $dbkey{$i} ) < 128 && ord( $dbkey{$i} ) > 32 ) {
 660                                 $dir .= strtolower( $dbkey{$i} );
 661                         } else {
 662                                 $dir .= sprintf( "%02X", ord( $dbkey{$i} ) );
 663                         }
 664                 }
 665                 return $dir;
 666         }
 667
 668         function getHashedFilename() {
 669                 $dbkey = $this->getPrefixedDBkey();
 670                 $dir = $this->getHashedDirectory();
 671                 $friendlyName = strtr( $dbkey, '/\\:*?"<>|', '_________' );
 672                 return "$dir/$friendlyName.html";
 673         }
 674
 675         /**
 676          * Get a URL with no fragment or server name
 677          * @param string $query an optional query string; if not specified,
 678          *      $wgArticlePath will be used.
 679          * @return string the URL
 680          * @access public
 681          */
 682         function getLocalURL( $query = '' ) {
 683                 global $wgLang, $wgArticlePath, $wgScript, $wgMakeDumpLinks;
 684
 685                 if ( $this->isExternal() ) {
 686                         return $this->getFullURL();
 687                 }
 688
 689                 $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 690                 if ( $wgMakeDumpLinks ) {
 691                         $url = str_replace( '$1', wfUrlencode( $this->getHashedFilename() ), $wgArticlePath );
 692                 } elseif ( $query == '' ) {
 693                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 694                 } else {
 695                         if( preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) ) {
 696                                 global $wgActionPaths;
 697                                 $action = urldecode( $matches[2] );
 698                                 if( isset( $wgActionPaths[$action] ) ) {
 699                                         $query = $matches[1];
 700                                         if( isset( $matches[4] ) ) $query .= $matches[4];
 701                                         $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 702                                         if( $query != '' ) $url .= '?' . $query;
 703                                         return $url;
 704                                 }
 705                         }
 706                         if ( $query == '-' ) {
 707                                 $query = '';
 708                         }
 709                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 710                 }
 711                 return $url;
 712         }
 713
 714         /**
 715          * Get an HTML-escaped version of the URL form, suitable for
 716          * using in a link, without a server name or fragment
 717          * @param string $query an optional query string
 718          * @return string the URL
 719          * @access public
 720          */
 721         function escapeLocalURL( $query = '' ) {
 722                 return htmlspecialchars( $this->getLocalURL( $query ) );
 723         }
 724
 725         /**
 726          * Get an HTML-escaped version of the URL form, suitable for
 727          * using in a link, including the server name and fragment
 728          *
 729          * @return string the URL
 730          * @param string $query an optional query string
 731          * @access public
 732          */
 733         function escapeFullURL( $query = '' ) {
 734                 return htmlspecialchars( $this->getFullURL( $query ) );
 735         }
 736
 737         /**
 738          * Get the URL form for an internal link.
 739          * - Used in various Squid-related code, in case we have a different
 740          * internal hostname for the server from the exposed one.
 741          *
 742          * @param string $query an optional query string
 743          * @return string the URL
 744          * @access public
 745          */
 746         function getInternalURL( $query = '' ) {
 747                 global $wgInternalServer;
 748                 return $wgInternalServer . $this->getLocalURL( $query );
 749         }
 750
 751         /**
 752          * Get the edit URL for this Title
 753          * @return string the URL, or a null string if this is an
 754          *      interwiki link
 755          * @access public
 756          */
 757         function getEditURL() {
 758                 global $wgServer, $wgScript;
 759
 760                 if ( '' != $this->mInterwiki ) { return ''; }
 761                 $s = $this->getLocalURL( 'action=edit' );
 762
 763                 return $s;
 764         }
 765
 766         /**
 767          * Get the HTML-escaped displayable text form.
 768          * Used for the title field in <a> tags.
 769          * @return string the text, including any prefixes
 770          * @access public
 771          */
 772         function getEscapedText() {
 773                 return htmlspecialchars( $this->getPrefixedText() );
 774         }
 775
 776         /**
 777          * Is this Title interwiki?
 778          * @return boolean
 779          * @access public
 780          */
 781         function isExternal() { return ( '' != $this->mInterwiki ); }
 782
 783         /**
 784          * Does the title correspond to a protected article?
 785          * @param string $what the action the page is protected from,
 786          *      by default checks move and edit
 787          * @return boolean
 788          * @access public
 789          */
 790         function isProtected($action = '') {
 791                 if ( -1 == $this->mNamespace ) { return true; }
 792                 if($action == 'edit' || $action == '') {
 793                         $a = $this->getRestrictions("edit");
 794                         if ( in_array( 'sysop', $a ) ) { return true; }
 795                 }
 796                 if($action == 'move' || $action == '') {
 797                         $a = $this->getRestrictions("move");
 798                         if ( in_array( 'sysop', $a ) ) { return true; }
 799                 }
 800                 return false;
 801         }
 802
 803         /**
 804          * Is $wgUser is watching this page?
 805          * @return boolean
 806          * @access public
 807          */
 808         function userIsWatching() {
 809                 global $wgUser;
 810
 811                 if ( -1 == $this->mNamespace ) { return false; }
 812                 if ( 0 == $wgUser->getID() ) { return false; }
 813
 814                 return $wgUser->isWatched( $this );
 815         }
 816
 817         /**
 818          * Is $wgUser perform $action this page?
 819          * @param string $action action that permission needs to be checked for
 820          * @return boolean
 821          * @access private
 822          */
 823         function userCan($action) {
 824                 $fname = 'Title::userCanEdit';
 825                 wfProfileIn( $fname );
 826
 827                 global $wgUser;
 828                 if( NS_SPECIAL == $this->mNamespace ) {
 829                         wfProfileOut( $fname );
 830                         return false;
 831                 }
 832                 if( NS_MEDIAWIKI == $this->mNamespace &&
 833                     !$wgUser->isAllowed('editinterface') ) {
 834                         wfProfileOut( $fname );
 835                         return false;
 836                 }
 837                 if( $this->mDbkeyform == '_' ) {
 838                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
 839                         wfProfileOut( $fname );
 840                         return false;
 841                 }
 842
 843                 # protect global styles and js
 844                 if ( NS_MEDIAWIKI == $this->mNamespace
 845                  && preg_match("/\\.(css|js)$/", $this->mTextform )
 846                      && !$wgUser->isAllowed('editinterface') ) {
 847                         wfProfileOut( $fname );
 848                         return false;
 849                 }
 850
 851                 # protect css/js subpages of user pages
 852                 # XXX: this might be better using restrictions
 853                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
 854                 if( NS_USER == $this->mNamespace
 855                         && preg_match("/\\.(css|js)$/", $this->mTextform )
 856                         && !$wgUser->isAllowed('editinterface')
 857                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
 858                         wfProfileOut( $fname );
 859                         return false;
 860                 }
 861
 862                 foreach( $this->getRestrictions($action) as $right ) {
 863                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
 864                                 wfProfileOut( $fname );
 865                                 return false;
 866                         }
 867                 }
 868
 869                 if( $action == 'move' && !$this->isMovable() ) {
 870                         wfProfileOut( $fname );
 871                         return false;
 872                 }
 873
 874                 wfProfileOut( $fname );
 875                 return true;
 876         }
 877
 878         /**
 879          * Can $wgUser edit this page?
 880          * @return boolean
 881          * @access public
 882          */
 883         function userCanEdit() {
 884                 return $this->userCan('edit');
 885         }
 886
 887         /**
 888          * Can $wgUser move this page?
 889          * @return boolean
 890          * @access public
 891          */
 892         function userCanMove() {
 893                 return $this->userCan('move');
 894         }
 895
 896         /**
 897          * Would anybody with sufficient privileges be able to mvoe this page?
 898          * Some pages just ain't movable.
 899          *
 900          * @return boolean
 901          * @access public
 902          */
 903         function isMovable() {
 904                 return Namespace::isMovable( $this->getNamespace() );
 905         }
 906
 907         /**
 908          * Can $wgUser read this page?
 909          * @return boolean
 910          * @access public
 911          */
 912         function userCanRead() {
 913                 global $wgUser;
 914
 915                 if( $wgUser->isAllowed('read') ) {
 916                         return true;
 917                 } else {
 918                         global $wgWhitelistRead;
 919
 920                         /** If anon users can create an account,
 921                             they need to reach the login page first! */
 922                         if( $wgUser->isAllowed( 'createaccount' )
 923                             && $this->mId == NS_SPECIAL
 924                             && $this->getText() == 'Userlogin' ) {
 925                                 return true;
 926                         }
 927
 928                         /** some pages are explicitly allowed */
 929                         $name = $this->getPrefixedText();
 930                         if( in_array( $name, $wgWhitelistRead ) ) {
 931                                 return true;
 932                         }
 933
 934                         # Compatibility with old settings
 935                         if( $this->getNamespace() == NS_MAIN ) {
 936                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
 937                                         return true;
 938                                 }
 939                         }
 940                 }
 941                 return false;
 942         }
 943
 944         /**
 945          * Is this a talk page of some sort?
 946          * @return bool
 947          * @access public
 948          */
 949         function isTalkPage() {
 950                 return Namespace::isTalk( $this->getNamespace() );
 951         }
 952
 953         /**
 954          * Is this a .css or .js subpage of a user page?
 955          * @return bool
 956          * @access public
 957          */
 958         function isCssJsSubpage() {
 959                 return ( NS_USER == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
 960         }
 961         /**
 962          * Is this a .css subpage of a user page?
 963          * @return bool
 964          * @access public
 965          */
 966         function isCssSubpage() {
 967                 return ( NS_USER == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
 968         }
 969         /**
 970          * Is this a .js subpage of a user page?
 971          * @return bool
 972          * @access public
 973          */
 974         function isJsSubpage() {
 975                 return ( NS_USER == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
 976         }
 977         /**
 978          * Protect css/js subpages of user pages: can $wgUser edit
 979          * this page?
 980          *
 981          * @return boolean
 982          * @todo XXX: this might be better using restrictions
 983          * @access public
 984          */
 985         function userCanEditCssJsSubpage() {
 986                 global $wgUser;
 987                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
 988         }
 989
 990         /**
 991          * Loads a string into mRestrictions array
 992          * @param string $res restrictions in string format
 993          * @access public
 994          */
 995         function loadRestrictions( $res ) {
 996                 foreach( explode( ':', trim( $res ) ) as $restrict ) {
 997                         $temp = explode( '=', trim( $restrict ) );
 998                         if(count($temp) == 1) {
 999                                 // old format should be treated as edit/move restriction
1000                                 $this->mRestrictions["edit"] = explode( ',', trim( $temp[0] ) );
1001                                 $this->mRestrictions["move"] = explode( ',', trim( $temp[0] ) );
1002                         } else {
1003                                 $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1004                         }
1005                 }
1006                 $this->mRestrictionsLoaded = true;
1007         }
1008
1009         /**
1010          * Accessor/initialisation for mRestrictions
1011          * @param string $action action that permission needs to be checked for
1012          * @return array the array of groups allowed to edit this article
1013          * @access public
1014          */
1015         function getRestrictions($action) {
1016                 $id = $this->getArticleID();
1017                 if ( 0 == $id ) { return array(); }
1018
1019                 if ( ! $this->mRestrictionsLoaded ) {
1020                         $dbr =& wfGetDB( DB_SLAVE );
1021                         $res = $dbr->selectField( 'page', 'page_restrictions', 'page_id='.$id );
1022                         $this->loadRestrictions( $res );
1023                 }
1024                 if( isset( $this->mRestrictions[$action] ) ) {
1025                         return $this->mRestrictions[$action];
1026                 }
1027                 return array();
1028         }
1029
1030         /**
1031          * Is there a version of this page in the deletion archive?
1032          * @return int the number of archived revisions
1033          * @access public
1034          */
1035         function isDeleted() {
1036                 $fname = 'Title::isDeleted';
1037                 $dbr =& wfGetDB( DB_SLAVE );
1038                 $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1039                         'ar_title' => $this->getDBkey() ), $fname );
1040                 return (int)$n;
1041         }
1042
1043         /**
1044          * Get the article ID for this Title from the link cache,
1045          * adding it if necessary
1046          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1047          *      for update
1048          * @return int the ID
1049          * @access public
1050          */
1051         function getArticleID( $flags = 0 ) {
1052                 global $wgLinkCache;
1053
1054                 if ( $flags & GAID_FOR_UPDATE ) {
1055                         $oldUpdate = $wgLinkCache->forUpdate( true );
1056                         $this->mArticleID = $wgLinkCache->addLinkObj( $this );
1057                         $wgLinkCache->forUpdate( $oldUpdate );
1058                 } else {
1059                         if ( -1 == $this->mArticleID ) {
1060                                 $this->mArticleID = $wgLinkCache->addLinkObj( $this );
1061                         }
1062                 }
1063                 return $this->mArticleID;
1064         }
1065
1066         /**
1067          * This clears some fields in this object, and clears any associated
1068          * keys in the "bad links" section of $wgLinkCache.
1069          *
1070          * - This is called from Article::insertNewArticle() to allow
1071          * loading of the new page_id. It's also called from
1072          * Article::doDeleteArticle()
1073          *
1074          * @param int $newid the new Article ID
1075          * @access public
1076          */
1077         function resetArticleID( $newid ) {
1078                 global $wgLinkCache;
1079                 $wgLinkCache->clearBadLink( $this->getPrefixedDBkey() );
1080
1081                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1082                 else { $this->mArticleID = $newid; }
1083                 $this->mRestrictionsLoaded = false;
1084                 $this->mRestrictions = array();
1085         }
1086
1087         /**
1088          * Updates page_touched for this page; called from LinksUpdate.php
1089          * @return bool true if the update succeded
1090          * @access public
1091          */
1092         function invalidateCache() {
1093                 if ( wfReadOnly() ) {
1094                         return;
1095                 }
1096
1097                 $now = wfTimestampNow();
1098                 $dbw =& wfGetDB( DB_MASTER );
1099                 $success = $dbw->update( 'page',
1100                         array( /* SET */
1101                                 'page_touched' => $dbw->timestamp()
1102                         ), array( /* WHERE */
1103                                 'page_namespace' => $this->getNamespace() ,
1104                                 'page_title' => $this->getDBkey()
1105                         ), 'Title::invalidateCache'
1106                 );
1107                 return $success;
1108         }
1109
1110         /**
1111          * Prefix some arbitrary text with the namespace or interwiki prefix
1112          * of this object
1113          *
1114          * @param string $name the text
1115          * @return string the prefixed text
1116          * @access private
1117          */
1118         /* private */ function prefix( $name ) {
1119                 global $wgContLang;
1120
1121                 $p = '';
1122                 if ( '' != $this->mInterwiki ) {
1123                         $p = $this->mInterwiki . ':';
1124                 }
1125                 if ( 0 != $this->mNamespace ) {
1126                         $p .= $wgContLang->getNsText( $this->mNamespace ) . ':';
1127                 }
1128                 return $p . $name;
1129         }
1130
1131         /**
1132          * Secure and split - main initialisation function for this object
1133          *
1134          * Assumes that mDbkeyform has been set, and is urldecoded
1135          * and uses underscores, but not otherwise munged.  This function
1136          * removes illegal characters, splits off the interwiki and
1137          * namespace prefixes, sets the other forms, and canonicalizes
1138          * everything.
1139          * @return bool true on success
1140          * @access private
1141          */
1142         /* private */ function secureAndSplit() {
1143                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1144                 $fname = 'Title::secureAndSplit';
1145                 wfProfileIn( $fname );
1146
1147                 # Initialisation
1148                 static $rxTc = false;
1149                 if( !$rxTc ) {
1150                         # % is needed as well
1151                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/S';
1152                 }
1153
1154                 $this->mInterwiki = $this->mFragment = '';
1155                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1156
1157                 # Clean up whitespace
1158                 #
1159                 $t = preg_replace( '/[ _]+/', '_', $this->mDbkeyform );
1160                 $t = trim( $t, '_' );
1161
1162                 if ( '' == $t ) {
1163                         wfProfileOut( $fname );
1164                         return false;
1165                 }
1166
1167                 if( false !== strpos( $t, UTF8_REPLACEMENT ) ) {
1168                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1169                         wfProfileOut( $fname );
1170                         return false;
1171                 }
1172
1173                 $this->mDbkeyform = $t;
1174
1175                 # Initial colon indicating main namespace
1176                 if ( ':' == $t{0} ) {
1177                         $r = substr( $t, 1 );
1178                         $this->mNamespace = NS_MAIN;
1179                 } else {
1180                         # Namespace or interwiki prefix
1181                         $firstPass = true;
1182                         do {
1183                                 if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $t, $m ) ) {
1184                                         $p = $m[1];
1185                                         $lowerNs = strtolower( $p );
1186                                         if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1187                                                 # Canonical namespace
1188                                                 $t = $m[2];
1189                                                 $this->mNamespace = $ns;
1190                                         } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1191                                                 # Ordinary namespace
1192                                                 $t = $m[2];
1193                                                 $this->mNamespace = $ns;
1194                                         } elseif( $this->getInterwikiLink( $p ) ) {
1195                                                 if( !$firstPass ) {
1196                                                         # Can't make a local interwiki link to an interwiki link.
1197                                                         # That's just crazy!
1198                                                         wfProfileOut( $fname );
1199                                                         return false;
1200                                                 }
1201
1202                                                 # Interwiki link
1203                                                 $t = $m[2];
1204                                                 $this->mInterwiki = $p;
1205
1206                                                 # Redundant interwiki prefix to the local wiki
1207                                                 if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1208                                                         if( $t == '' ) {
1209                                                                 # Can't have an empty self-link
1210                                                                 wfProfileOut( $fname );
1211                                                                 return false;
1212                                                         }
1213                                                         $this->mInterwiki = '';
1214                                                         $firstPass = false;
1215                                                         # Do another namespace split...
1216                                                         continue;
1217                                                 }
1218                                         }
1219                                         # If there's no recognized interwiki or namespace,
1220                                         # then let the colon expression be part of the title.
1221                                 }
1222                                 break;
1223                         } while( true );
1224                         $r = $t;
1225                 }
1226
1227                 # We already know that some pages won't be in the database!
1228                 #
1229                 if ( '' != $this->mInterwiki || -1 == $this->mNamespace ) {
1230                         $this->mArticleID = 0;
1231                 }
1232                 $f = strstr( $r, '#' );
1233                 if ( false !== $f ) {
1234                         $this->mFragment = substr( $f, 1 );
1235                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
1236                         # remove whitespace again: prevents "Foo_bar_#"
1237                         # becoming "Foo_bar_"
1238                         $r = preg_replace( '/_*$/', '', $r );
1239                 }
1240
1241                 # Reject illegal characters.
1242                 #
1243                 if( preg_match( $rxTc, $r ) ) {
1244                         wfProfileOut( $fname );
1245                         return false;
1246                 }
1247
1248                 /**
1249                  * Pages with "/./" or "/../" appearing in the URLs will
1250                  * often be unreachable due to the way web browsers deal
1251                  * with 'relative' URLs. Forbid them explicitly.
1252                  */
1253                 if ( strpos( $r, '.' ) !== false &&
1254                      ( $r === '.' || $r === '..' ||
1255                        strpos( $r, './' ) === 0  ||
1256                        strpos( $r, '../' ) === 0 ||
1257                        strpos( $r, '/./' ) !== false ||
1258                        strpos( $r, '/../' ) !== false ) )
1259                 {
1260                         wfProfileOut( $fname );
1261                         return false;
1262                 }
1263
1264                 # We shouldn't need to query the DB for the size.
1265                 #$maxSize = $dbr->textFieldSize( 'page', 'page_title' );
1266                 if ( strlen( $r ) > 255 ) {
1267                         wfProfileOut( $fname );
1268                         return false;
1269                 }
1270
1271                 /**
1272                  * Normally, all wiki links are forced to have
1273                  * an initial capital letter so [[foo]] and [[Foo]]
1274                  * point to the same place.
1275                  *
1276                  * Don't force it for interwikis, since the other
1277                  * site might be case-sensitive.
1278                  */
1279                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1280                         $t = $wgContLang->ucfirst( $r );
1281                 } else {
1282                         $t = $r;
1283                 }
1284
1285                 /**
1286                  * Can't make a link to a namespace alone...
1287                  * "empty" local links can only be self-links
1288                  * with a fragment identifier.
1289                  */
1290                 if( $t == '' &&
1291                         $this->mInterwiki == '' &&
1292                         $this->mNamespace != NS_MAIN ) {
1293                         wfProfileOut( $fname );
1294                         return false;
1295                 }
1296
1297                 # Fill fields
1298                 $this->mDbkeyform = $t;
1299                 $this->mUrlform = wfUrlencode( $t );
1300
1301                 $this->mTextform = str_replace( '_', ' ', $t );
1302
1303                 wfProfileOut( $fname );
1304                 return true;
1305         }
1306
1307         /**
1308          * Get a Title object associated with the talk page of this article
1309          * @return Title the object for the talk page
1310          * @access public
1311          */
1312         function getTalkPage() {
1313                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1314         }
1315
1316         /**
1317          * Get a title object associated with the subject page of this
1318          * talk page
1319          *
1320          * @return Title the object for the subject page
1321          * @access public
1322          */
1323         function getSubjectPage() {
1324                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1325         }
1326
1327         /**
1328          * Get an array of Title objects linking to this Title
1329          * - Also stores the IDs in the link cache.
1330          *
1331          * @param string $options may be FOR UPDATE
1332          * @return array the Title objects linking here
1333          * @access public
1334          */
1335         function getLinksTo( $options = '' ) {
1336                 global $wgLinkCache;
1337                 $id = $this->getArticleID();
1338
1339                 if ( $options ) {
1340                         $db =& wfGetDB( DB_MASTER );
1341                 } else {
1342                         $db =& wfGetDB( DB_SLAVE );
1343                 }
1344                 $page = $db->tableName( 'page' );
1345                 $links = $db->tableName( 'links' );
1346
1347                 $sql = "SELECT page_namespace,page_title,page_id FROM $page,$links WHERE l_from=page_id AND l_to={$id} $options";
1348                 $res = $db->query( $sql, 'Title::getLinksTo' );
1349                 $retVal = array();
1350                 if ( $db->numRows( $res ) ) {
1351                         while ( $row = $db->fetchObject( $res ) ) {
1352                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1353                                         $wgLinkCache->addGoodLink( $row->page_id, $titleObj->getPrefixedDBkey() );
1354                                         $retVal[] = $titleObj;
1355                                 }
1356                         }
1357                 }
1358                 $db->freeResult( $res );
1359                 return $retVal;
1360         }
1361
1362         /**
1363          * Get an array of Title objects linking to this non-existent title.
1364          * - Also stores the IDs in the link cache.
1365          *
1366          * @param string $options may be FOR UPDATE
1367          * @return array the Title objects linking here
1368          * @access public
1369          */
1370         function getBrokenLinksTo( $options = '' ) {
1371                 global $wgLinkCache;
1372
1373                 if ( $options ) {
1374                         $db =& wfGetDB( DB_MASTER );
1375                 } else {
1376                         $db =& wfGetDB( DB_SLAVE );
1377                 }
1378                 $page = $db->tableName( 'page' );
1379                 $brokenlinks = $db->tableName( 'brokenlinks' );
1380                 $encTitle = $db->strencode( $this->getPrefixedDBkey() );
1381
1382                 $sql = "SELECT page_namespace,page_title,page_id FROM $brokenlinks,$page " .
1383                   "WHERE bl_from=page_id AND bl_to='$encTitle' $options";
1384                 $res = $db->query( $sql, "Title::getBrokenLinksTo" );
1385                 $retVal = array();
1386                 if ( $db->numRows( $res ) ) {
1387                         while ( $row = $db->fetchObject( $res ) ) {
1388                                 $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title );
1389                                 $wgLinkCache->addGoodLink( $row->page_id, $titleObj->getPrefixedDBkey() );
1390                                 $retVal[] = $titleObj;
1391                         }
1392                 }
1393                 $db->freeResult( $res );
1394                 return $retVal;
1395         }
1396
1397
1398         /**
1399          * Get an array of Title objects referring to non-existent articles linked from this page
1400          *
1401          * @param string $options may be FOR UPDATE
1402          * @return array the Title objects
1403          * @access public
1404          */
1405         function getBrokenLinksFrom( $options = '' ) {
1406                 global $wgLinkCache;
1407
1408                 if ( $options ) {
1409                         $db =& wfGetDB( DB_MASTER );
1410                 } else {
1411                         $db =& wfGetDB( DB_SLAVE );
1412                 }
1413                 $page = $db->tableName( 'page' );
1414                 $brokenlinks = $db->tableName( 'brokenlinks' );
1415                 $id = $this->getArticleID();
1416
1417                 $sql = "SELECT bl_to FROM $brokenlinks WHERE bl_from=$id $options";
1418                 $res = $db->query( $sql, "Title::getBrokenLinksFrom" );
1419                 $retVal = array();
1420                 if ( $db->numRows( $res ) ) {
1421                         while ( $row = $db->fetchObject( $res ) ) {
1422                                 $retVal[] = Title::newFromText( $row->bl_to );
1423                         }
1424                 }
1425                 $db->freeResult( $res );
1426                 return $retVal;
1427         }
1428
1429
1430         /**
1431          * Get a list of URLs to purge from the Squid cache when this
1432          * page changes
1433          *
1434          * @return array the URLs
1435          * @access public
1436          */
1437         function getSquidURLs() {
1438                 return array(
1439                         $this->getInternalURL(),
1440                         $this->getInternalURL( 'action=history' )
1441                 );
1442         }
1443
1444         /**
1445          * Move this page without authentication
1446          * @param Title &$nt the new page Title
1447          * @access public
1448          */
1449         function moveNoAuth( &$nt ) {
1450                 return $this->moveTo( $nt, false );
1451         }
1452
1453         /**
1454          * Move a title to a new location
1455          * @param Title &$nt the new title
1456          * @param bool $auth indicates whether $wgUser's permissions
1457          *      should be checked
1458          * @return mixed true on success, message name on failure
1459          * @access public
1460          */
1461         function moveTo( &$nt, $auth = true, $reason = '' ) {
1462                 global $wgUser;
1463                 if( !$this or !$nt ) {
1464                         return 'badtitletext';
1465                 }
1466
1467                 $fname = 'Title::move';
1468                 $oldid = $this->getArticleID();
1469                 $newid = $nt->getArticleID();
1470
1471                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1472                         return 'articleexists';
1473                 }
1474                 if ( ( ! Namespace::isMovable( $this->getNamespace() ) ) ||
1475                          ( '' == $this->getDBkey() ) ||
1476                          ( '' != $this->getInterwiki() ) ||
1477                          ( !$oldid ) ||
1478                      ( ! Namespace::isMovable( $nt->getNamespace() ) ) ||
1479                          ( '' == $nt->getDBkey() ) ||
1480                          ( '' != $nt->getInterwiki() ) ) {
1481                         return 'badarticleerror';
1482                 }
1483
1484                 if ( $auth && (
1485                                 !$this->userCanEdit() || !$nt->userCanEdit() ||
1486                                 !$this->userCanMove() || !$nt->userCanMove() ) ) {
1487                         return 'protectedpage';
1488                 }
1489
1490                 # The move is allowed only if (1) the target doesn't exist, or
1491                 # (2) the target is a redirect to the source, and has no history
1492                 # (so we can undo bad moves right after they're done).
1493
1494                 if ( 0 != $newid ) { # Target exists; check for validity
1495                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1496                                 return 'articleexists';
1497                         }
1498                         $this->moveOverExistingRedirect( $nt, $reason );
1499                 } else { # Target didn't exist, do normal move.
1500                         $this->moveToNewTitle( $nt, $newid, $reason );
1501                 }
1502
1503                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
1504
1505                 $dbw =& wfGetDB( DB_MASTER );
1506                 $categorylinks = $dbw->tableName( 'categorylinks' );
1507                 $sql = "UPDATE $categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
1508                         " WHERE cl_from=" . $dbw->addQuotes( $this->getArticleID() ) .
1509                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
1510                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
1511
1512                 # Update watchlists
1513
1514                 $oldnamespace = $this->getNamespace() & ~1;
1515                 $newnamespace = $nt->getNamespace() & ~1;
1516                 $oldtitle = $this->getDBkey();
1517                 $newtitle = $nt->getDBkey();
1518
1519                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
1520                         WatchedItem::duplicateEntries( $this, $nt );
1521                 }
1522
1523                 # Update search engine
1524                 $u = new SearchUpdate( $oldid, $nt->getPrefixedDBkey() );
1525                 $u->doUpdate();
1526                 $u = new SearchUpdate( $newid, $this->getPrefixedDBkey(), '' );
1527                 $u->doUpdate();
1528
1529                 wfRunHooks( 'TitleMoveComplete', array(&$this, &$nt, &$wgUser, $oldid, $newid) );
1530                 return true;
1531         }
1532
1533         /**
1534          * Move page to a title which is at present a redirect to the
1535          * source page
1536          *
1537          * @param Title &$nt the page to move to, which should currently
1538          *      be a redirect
1539          * @access private
1540          */
1541         /* private */ function moveOverExistingRedirect( &$nt, $reason = '' ) {
1542                 global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
1543                 $fname = 'Title::moveOverExistingRedirect';
1544                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1545
1546                 if ( $reason ) {
1547                         $comment .= ": $reason";
1548                 }
1549
1550                 $now = wfTimestampNow();
1551                 $rand = wfRandom();
1552                 $newid = $nt->getArticleID();
1553                 $oldid = $this->getArticleID();
1554                 $dbw =& wfGetDB( DB_MASTER );
1555                 $links = $dbw->tableName( 'links' );
1556
1557                 # Delete the old redirect. We don't save it to history since
1558                 # by definition if we've got here it's rather uninteresting.
1559                 # We have to remove it so that the next step doesn't trigger
1560                 # a conflict on the unique namespace+title index...
1561                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
1562
1563                 # Save a null revision in the page's history notifying of the move
1564                 $nullRevision = Revision::newNullRevision( $dbw, $oldid,
1565                         wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() ),
1566                         true );
1567                 $nullRevId = $nullRevision->insertOn( $dbw );
1568
1569                 # Change the name of the target page:
1570                 $dbw->update( 'page',
1571                         /* SET */ array(
1572                                 'page_touched'   => $dbw->timestamp($now),
1573                                 'page_namespace' => $nt->getNamespace(),
1574                                 'page_title'     => $nt->getDBkey(),
1575                                 'page_latest'    => $nullRevId,
1576                         ),
1577                         /* WHERE */ array( 'page_id' => $oldid ),
1578                         $fname
1579                 );
1580                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1581
1582                 # Recreate the redirect, this time in the other direction.
1583                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1584                 $redirectArticle = new Article( $this );
1585                 $newid = $redirectArticle->insertOn( $dbw );
1586                 $redirectRevision = new Revision( array(
1587                         'page'    => $newid,
1588                         'comment' => $comment,
1589                         'text'    => $redirectText ) );
1590                 $revid = $redirectRevision->insertOn( $dbw );
1591                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1592                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1593
1594                 # Log the move
1595                 $log = new LogPage( 'move' );
1596                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
1597
1598                 # Swap links
1599
1600                 # Load titles and IDs
1601                 $linksToOld = $this->getLinksTo( 'FOR UPDATE' );
1602                 $linksToNew = $nt->getLinksTo( 'FOR UPDATE' );
1603
1604                 # Delete them all
1605                 $sql = "DELETE FROM $links WHERE l_to=$oldid OR l_to=$newid";
1606                 $dbw->query( $sql, $fname );
1607
1608                 # Reinsert
1609                 if ( count( $linksToOld ) || count( $linksToNew )) {
1610                         $sql = "INSERT INTO $links (l_from,l_to) VALUES ";
1611                         $first = true;
1612
1613                         # Insert links to old title
1614                         foreach ( $linksToOld as $linkTitle ) {
1615                                 if ( $first ) {
1616                                         $first = false;
1617                                 } else {
1618                                         $sql .= ',';
1619                                 }
1620                                 $id = $linkTitle->getArticleID();
1621                                 $sql .= "($id,$newid)";
1622                         }
1623
1624                         # Insert links to new title
1625                         foreach ( $linksToNew as $linkTitle ) {
1626                                 if ( $first ) {
1627                                         $first = false;
1628                                 } else {
1629                                         $sql .= ',';
1630                                 }
1631                                 $id = $linkTitle->getArticleID();
1632                                 $sql .= "($id, $oldid)";
1633                         }
1634
1635                         $dbw->query( $sql, $fname );
1636                 }
1637
1638                 # Now, we record the link from the redirect to the new title.
1639                 # It should have no other outgoing links...
1640                 $dbw->delete( 'links', array( 'l_from' => $newid ) );
1641                 $dbw->insert( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ) );
1642
1643                 # Clear linkscc
1644                 LinkCache::linksccClearLinksTo( $oldid );
1645                 LinkCache::linksccClearLinksTo( $newid );
1646
1647                 # Purge squid
1648                 if ( $wgUseSquid ) {
1649                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1650                         $u = new SquidUpdate( $urls );
1651                         $u->doUpdate();
1652                 }
1653         }
1654
1655         /**
1656          * Move page to non-existing title.
1657          * @param Title &$nt the new Title
1658          * @param int &$newid set to be the new article ID
1659          * @access private
1660          */
1661         /* private */ function moveToNewTitle( &$nt, &$newid, $reason = '' ) {
1662                 global $wgUser, $wgLinkCache, $wgUseSquid;
1663                 global $wgMwRedir;
1664                 $fname = 'MovePageForm::moveToNewTitle';
1665                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1666                 if ( $reason ) {
1667                         $comment .= ": $reason";
1668                 }
1669
1670                 $newid = $nt->getArticleID();
1671                 $oldid = $this->getArticleID();
1672                 $dbw =& wfGetDB( DB_MASTER );
1673                 $now = $dbw->timestamp();
1674                 wfSeedRandom();
1675                 $rand = wfRandom();
1676
1677                 # Save a null revision in the page's history notifying of the move
1678                 $nullRevision = Revision::newNullRevision( $dbw, $oldid,
1679                         wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() ),
1680                         true );
1681                 $nullRevId = $nullRevision->insertOn( $dbw );
1682
1683                 # Rename cur entry
1684                 $dbw->update( 'page',
1685                         /* SET */ array(
1686                                 'page_touched'   => $now,
1687                                 'page_namespace' => $nt->getNamespace(),
1688                                 'page_title'     => $nt->getDBkey(),
1689                                 'page_latest'    => $nullRevId,
1690                         ),
1691                         /* WHERE */ array( 'page_id' => $oldid ),
1692                         $fname
1693                 );
1694
1695                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1696
1697                 # Insert redirect
1698                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1699                 $redirectArticle = new Article( $this );
1700                 $newid = $redirectArticle->insertOn( $dbw );
1701                 $redirectRevision = new Revision( array(
1702                         'page'    => $newid,
1703                         'comment' => $comment,
1704                         'text'    => $redirectText ) );
1705                 $revid = $redirectRevision->insertOn( $dbw );
1706                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1707                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1708
1709                 # Log the move
1710                 $log = new LogPage( 'move' );
1711                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
1712
1713                 # Purge squid and linkscc as per article creation
1714                 Article::onArticleCreate( $nt );
1715
1716                 # Any text links to the old title must be reassigned to the redirect
1717                 $dbw->update( 'links', array( 'l_to' => $newid ), array( 'l_to' => $oldid ), $fname );
1718                 LinkCache::linksccClearLinksTo( $oldid );
1719
1720                 # Record the just-created redirect's linking to the page
1721                 $dbw->insert( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ), $fname );
1722
1723                 # Non-existent target may have had broken links to it; these must
1724                 # now be removed and made into good links.
1725                 $update = new LinksUpdate( $oldid, $nt->getPrefixedDBkey() );
1726                 $update->fixBrokenLinks();
1727
1728                 # Purge old title from squid
1729                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1730                 $titles = $nt->getLinksTo();
1731                 if ( $wgUseSquid ) {
1732                         $urls = $this->getSquidURLs();
1733                         foreach ( $titles as $linkTitle ) {
1734                                 $urls[] = $linkTitle->getInternalURL();
1735                         }
1736                         $u = new SquidUpdate( $urls );
1737                         $u->doUpdate();
1738                 }
1739         }
1740
1741         /**
1742          * Checks if $this can be moved to a given Title
1743          * - Selects for update, so don't call it unless you mean business
1744          *
1745          * @param Title &$nt the new title to check
1746          * @access public
1747          */
1748         function isValidMoveTarget( $nt ) {
1749
1750                 $fname = 'Title::isValidMoveTarget';
1751                 $dbw =& wfGetDB( DB_MASTER );
1752
1753                 # Is it a redirect?
1754                 $id  = $nt->getArticleID();
1755                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
1756                         array( 'page_is_redirect','old_text' ),
1757                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
1758                         $fname, 'FOR UPDATE' );
1759
1760                 if ( !$obj || 0 == $obj->page_is_redirect ) {
1761                         # Not a redirect
1762                         return false;
1763                 }
1764
1765                 # Does the redirect point to the source?
1766                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $obj->old_text, $m ) ) {
1767                         $redirTitle = Title::newFromText( $m[1] );
1768                         if( !is_object( $redirTitle ) ||
1769                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1770                                 return false;
1771                         }
1772                 }
1773
1774                 # Does the article have a history?
1775                 $row = $dbw->selectRow( array( 'page', 'revision'),
1776                         array( 'rev_id' ),
1777                         array( 'page_namespace' => $nt->getNamespace(),
1778                                 'page_title' => $nt->getDBkey(),
1779                                 'page_id=rev_page AND page_latest != rev_id'
1780                         ), $fname, 'FOR UPDATE'
1781                 );
1782
1783                 # Return true if there was no history
1784                 return $row === false;
1785         }
1786
1787         /**
1788          * Create a redirect; fails if the title already exists; does
1789          * not notify RC
1790          *
1791          * @param Title $dest the destination of the redirect
1792          * @param string $comment the comment string describing the move
1793          * @return bool true on success
1794          * @access public
1795          */
1796         function createRedirect( $dest, $comment ) {
1797                 global $wgUser;
1798                 if ( $this->getArticleID() ) {
1799                         return false;
1800                 }
1801
1802                 $fname = 'Title::createRedirect';
1803                 $dbw =& wfGetDB( DB_MASTER );
1804
1805                 $article = new Article( $this );
1806                 $newid = $article->insertOn( $dbw );
1807                 $revision = new Revision( array(
1808                         'page'      => $newid,
1809                         'comment'   => $comment,
1810                         'text'      => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n",
1811                         ) );
1812                 $revisionId = $revision->insertOn( $dbw );
1813                 $article->updateRevisionOn( $dbw, $revision, 0 );
1814
1815                 # Link table
1816                 if ( $dest->getArticleID() ) {
1817                         $dbw->insert( 'links',
1818                                 array(
1819                                         'l_to' => $dest->getArticleID(),
1820                                         'l_from' => $newid
1821                                 ), $fname
1822                         );
1823                 } else {
1824                         $dbw->insert( 'brokenlinks',
1825                                 array(
1826                                         'bl_to' => $dest->getPrefixedDBkey(),
1827                                         'bl_from' => $newid
1828                                 ), $fname
1829                         );
1830                 }
1831
1832                 Article::onArticleCreate( $this );
1833                 return true;
1834         }
1835
1836         /**
1837          * Get categories to which this Title belongs and return an array of
1838          * categories' names.
1839          *
1840          * @return array an array of parents in the form:
1841          *      $parent => $currentarticle
1842          * @access public
1843          */
1844         function getParentCategories() {
1845                 global $wgContLang,$wgUser;
1846
1847                 $titlekey = $this->getArticleId();
1848                 $sk =& $wgUser->getSkin();
1849                 $parents = array();
1850                 $dbr =& wfGetDB( DB_SLAVE );
1851                 $categorylinks = $dbr->tableName( 'categorylinks' );
1852
1853                 # NEW SQL
1854                 $sql = "SELECT * FROM $categorylinks"
1855                      ." WHERE cl_from='$titlekey'"
1856                          ." AND cl_from <> '0'"
1857                          ." ORDER BY cl_sortkey";
1858
1859                 $res = $dbr->query ( $sql ) ;
1860
1861                 if($dbr->numRows($res) > 0) {
1862                         while ( $x = $dbr->fetchObject ( $res ) )
1863                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
1864                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
1865                         $dbr->freeResult ( $res ) ;
1866                 } else {
1867                         $data = '';
1868                 }
1869                 return $data;
1870         }
1871
1872         /**
1873          * Get a tree of parent categories
1874          * @param array $children an array with the children in the keys, to check for circular refs
1875          * @return array
1876          * @access public
1877          */
1878         function getParentCategoryTree( $children = array() ) {
1879                 $parents = $this->getParentCategories();
1880
1881                 if($parents != '') {
1882                         foreach($parents as $parent => $current)
1883                         {
1884                                 if ( array_key_exists( $parent, $children ) ) {
1885                                         # Circular reference
1886                                         $stack[$parent] = array();
1887                                 } else {
1888                                         $nt = Title::newFromText($parent);
1889                                         $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
1890                                 }
1891                         }
1892                         return $stack;
1893                 } else {
1894                         return array();
1895                 }
1896         }
1897
1898
1899         /**
1900          * Get an associative array for selecting this title from
1901          * the "cur" table
1902          *
1903          * @return array
1904          * @access public
1905          */
1906         function curCond() {
1907                 wfDebugDieBacktrace( 'curCond called' );
1908                 return array( 'cur_namespace' => $this->mNamespace, 'cur_title' => $this->mDbkeyform );
1909         }
1910
1911         /**
1912          * Get an associative array for selecting this title from the
1913          * "old" table
1914          *
1915          * @return array
1916          * @access public
1917          */
1918         function oldCond() {
1919                 wfDebugDieBacktrace( 'oldCond called' );
1920                 return array( 'old_namespace' => $this->mNamespace, 'old_title' => $this->mDbkeyform );
1921         }
1922
1923         /**
1924          * Get the revision ID of the previous revision
1925          *
1926          * @param integer $revision  Revision ID. Get the revision that was before this one.
1927          * @return interger $oldrevision|false
1928          */
1929         function getPreviousRevisionID( $revision ) {
1930                 $dbr =& wfGetDB( DB_SLAVE );
1931                 return $dbr->selectField( 'revision', 'rev_id',
1932                         'rev_page=' . IntVal( $this->getArticleId() ) .
1933                         ' AND rev_id<' . IntVal( $revision ) . ' ORDER BY rev_id DESC' );
1934         }
1935
1936         /**
1937          * Get the revision ID of the next revision
1938          *
1939          * @param integer $revision  Revision ID. Get the revision that was after this one.
1940          * @return interger $oldrevision|false
1941          */
1942         function getNextRevisionID( $revision ) {
1943                 $dbr =& wfGetDB( DB_SLAVE );
1944                 return $dbr->selectField( 'revision', 'rev_id',
1945                         'rev_page=' . IntVal( $this->getArticleId() ) .
1946                         ' AND rev_id>' . IntVal( $revision ) . ' ORDER BY rev_id' );
1947         }
1948
1949         /**
1950          * Compare with another title.
1951          *
1952          * @param Title $title
1953          * @return bool
1954          */
1955         function equals( &$title ) {
1956                 return $this->getInterwiki() == $title->getInterwiki()
1957                         && $this->getNamespace() == $title->getNamespace()
1958                         && $this->getDbkey() == $title->getDbkey();
1959         }
1960
1961 }
1962 ?>