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 $mLatestID;         # ID of most recent revision
  46         var $mRestrictions;       # Array of groups allowed to edit this article
  47                               # Only null or "sysop" are supported
  48         var $mRestrictionsLoaded; # Boolean for initialisation on demand
  49         var $mPrefixedText;       # Text form including namespace/interwiki, initialised on demand
  50         var $mDefaultNamespace;   # Namespace index when there is no namespace
  51                               # Zero except in {{transclusion}} tags
  52         var $mWatched;            # Is $wgUser watching this page? NULL if unfilled, accessed through userIsWatching()
  53         /**#@-*/
  54
  55
  56         /**
  57          * Constructor
  58          * @access private
  59          */
  60         /* private */ function Title() {
  61                 $this->mInterwiki = $this->mUrlform =
  62                 $this->mTextform = $this->mDbkeyform = '';
  63                 $this->mArticleID = -1;
  64                 $this->mNamespace = NS_MAIN;
  65                 $this->mRestrictionsLoaded = false;
  66                 $this->mRestrictions = array();
  67                 # Dont change the following, NS_MAIN is hardcoded in several place
  68                 # See bug #696
  69                 $this->mDefaultNamespace = NS_MAIN;
  70                 $this->mWatched = NULL;
  71                 $this->mLatestID = false;
  72         }
  73
  74         /**
  75          * Create a new Title from a prefixed DB key
  76          * @param string $key The database key, which has underscores
  77          *      instead of spaces, possibly including namespace and
  78          *      interwiki prefixes
  79          * @return Title the new object, or NULL on an error
  80          * @static
  81          * @access public
  82          */
  83         /* static */ function newFromDBkey( $key ) {
  84                 $t = new Title();
  85                 $t->mDbkeyform = $key;
  86                 if( $t->secureAndSplit() )
  87                         return $t;
  88                 else
  89                         return NULL;
  90         }
  91
  92         /**
  93          * Create a new Title from text, such as what one would
  94          * find in a link. Decodes any HTML entities in the text.
  95          *
  96          * @param string $text the link text; spaces, prefixes,
  97          *      and an initial ':' indicating the main namespace
  98          *      are accepted
  99          * @param int $defaultNamespace the namespace to use if
 100          *      none is specified by a prefix
 101          * @return Title the new object, or NULL on an error
 102          * @static
 103          * @access public
 104          */
 105         function newFromText( $text, $defaultNamespace = NS_MAIN ) {
 106                 $fname = 'Title::newFromText';
 107                 wfProfileIn( $fname );
 108
 109                 if( is_object( $text ) ) {
 110                         wfDebugDieBacktrace( 'Title::newFromText given an object' );
 111                 }
 112
 113                 /**
 114                  * Wiki pages often contain multiple links to the same page.
 115                  * Title normalization and parsing can become expensive on
 116                  * pages with many links, so we can save a little time by
 117                  * caching them.
 118                  *
 119                  * In theory these are value objects and won't get changed...
 120                  */
 121                 static $titleCache = array();
 122                 if( $defaultNamespace == NS_MAIN && isset( $titleCache[$text] ) ) {
 123                         wfProfileOut( $fname );
 124                         return $titleCache[$text];
 125                 }
 126
 127                 /**
 128                  * Convert things like &eacute; &#257; or &#x3017; into real text...
 129                  */
 130                 $filteredText = Sanitizer::decodeCharReferences( $text );
 131
 132                 $t =& new Title();
 133                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 134                 $t->mDefaultNamespace = $defaultNamespace;
 135
 136                 if( $t->secureAndSplit() ) {
 137                         if( $defaultNamespace == NS_MAIN ) {
 138                                 if( count( $titleCache ) >= MW_TITLECACHE_MAX ) {
 139                                         # Avoid memory leaks on mass operations...
 140                                         $titleCache = array();
 141                                 }
 142                                 $titleCache[$text] =& $t;
 143                         }
 144                         wfProfileOut( $fname );
 145                         return $t;
 146                 } else {
 147                         wfProfileOut( $fname );
 148                         $ret = NULL;
 149                         return $ret;
 150                 }
 151         }
 152
 153         /**
 154          * Create a new Title from URL-encoded text. Ensures that
 155          * the given title's length does not exceed the maximum.
 156          * @param string $url the title, as might be taken from a URL
 157          * @return Title the new object, or NULL on an error
 158          * @static
 159          * @access public
 160          */
 161         function newFromURL( $url ) {
 162                 global $wgLang, $wgServer;
 163                 $t = new Title();
 164
 165                 # For compatibility with old buggy URLs. "+" is not valid in titles,
 166                 # but some URLs used it as a space replacement and they still come
 167                 # from some external search tools.
 168                 $s = str_replace( '+', ' ', $url );
 169
 170                 $t->mDbkeyform = str_replace( ' ', '_', $s );
 171                 if( $t->secureAndSplit() ) {
 172                         return $t;
 173                 } else {
 174                         return NULL;
 175                 }
 176         }
 177
 178         /**
 179          * Create a new Title from an article ID
 180          *
 181          * @todo This is inefficiently implemented, the page row is requested
 182          *       but not used for anything else
 183          *
 184          * @param int $id the page_id corresponding to the Title to create
 185          * @return Title the new object, or NULL on an error
 186          * @access public
 187          * @static
 188          */
 189         function newFromID( $id ) {
 190                 $fname = 'Title::newFromID';
 191                 $dbr =& wfGetDB( DB_SLAVE );
 192                 $row = $dbr->selectRow( 'page', array( 'page_namespace', 'page_title' ),
 193                         array( 'page_id' => $id ), $fname );
 194                 if ( $row !== false ) {
 195                         $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 196                 } else {
 197                         $title = NULL;
 198                 }
 199                 return $title;
 200         }
 201
 202         /**
 203          * Create a new Title from a namespace index and a DB key.
 204          * It's assumed that $ns and $title are *valid*, for instance when
 205          * they came directly from the database or a special page name.
 206          * For convenience, spaces are converted to underscores so that
 207          * eg user_text fields can be used directly.
 208          *
 209          * @param int $ns the namespace of the article
 210          * @param string $title the unprefixed database key form
 211          * @return Title the new object
 212          * @static
 213          * @access public
 214          */
 215         function &makeTitle( $ns, $title ) {
 216                 $t =& new Title();
 217                 $t->mInterwiki = '';
 218                 $t->mFragment = '';
 219                 $t->mNamespace = intval( $ns );
 220                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 221                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 222                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 223                 $t->mTextform = str_replace( '_', ' ', $title );
 224                 return $t;
 225         }
 226
 227         /**
 228          * Create a new Title frrom a namespace index and a DB key.
 229          * The parameters will be checked for validity, which is a bit slower
 230          * than makeTitle() but safer for user-provided data.
 231          *
 232          * @param int $ns the namespace of the article
 233          * @param string $title the database key form
 234          * @return Title the new object, or NULL on an error
 235          * @static
 236          * @access public
 237          */
 238         function makeTitleSafe( $ns, $title ) {
 239                 $t = new Title();
 240                 $t->mDbkeyform = Title::makeName( $ns, $title );
 241                 if( $t->secureAndSplit() ) {
 242                         return $t;
 243                 } else {
 244                         return NULL;
 245                 }
 246         }
 247
 248         /**
 249          * Create a new Title for the Main Page
 250          *
 251          * @static
 252          * @return Title the new object
 253          * @access public
 254          */
 255         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         function newFromRedirect( $text ) {
 268                 global $wgMwRedir;
 269                 $rt = NULL;
 270                 if ( $wgMwRedir->matchStart( $text ) ) {
 271                         if ( preg_match( '/\[{2}(.*?)(?:\||\]{2})/', $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         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         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                 return $n == '' ? $title : "$n:$title";
 380         }
 381
 382         /**
 383          * Returns the URL associated with an interwiki prefix
 384          * @param string $key the interwiki prefix (e.g. "MeatBall")
 385          * @return the associated URL, containing "$1", which should be
 386          *      replaced by an article title
 387          * @static (arguably)
 388          * @access public
 389          */
 390         function getInterwikiLink( $key, $transludeonly = false ) {
 391                 global $wgMemc, $wgDBname, $wgInterwikiExpiry, $wgTitleInterwikiCache;
 392                 $fname = 'Title::getInterwikiLink';
 393
 394                 wfProfileIn( $fname );
 395
 396                 $k = $wgDBname.':interwiki:'.$key;
 397                 if( array_key_exists( $k, $wgTitleInterwikiCache ) ) {
 398                         wfProfileOut( $fname );
 399                         return $wgTitleInterwikiCache[$k]->iw_url;
 400                 }
 401
 402                 $s = $wgMemc->get( $k );
 403                 # Ignore old keys with no iw_local
 404                 if( $s && isset( $s->iw_local ) && isset($s->iw_trans)) {
 405                         $wgTitleInterwikiCache[$k] = $s;
 406                         wfProfileOut( $fname );
 407                         return $s->iw_url;
 408                 }
 409
 410                 $dbr =& wfGetDB( DB_SLAVE );
 411                 $res = $dbr->select( 'interwiki',
 412                         array( 'iw_url', 'iw_local', 'iw_trans' ),
 413                         array( 'iw_prefix' => $key ), $fname );
 414                 if( !$res ) {
 415                         wfProfileOut( $fname );
 416                         return '';
 417                 }
 418
 419                 $s = $dbr->fetchObject( $res );
 420                 if( !$s ) {
 421                         # Cache non-existence: create a blank object and save it to memcached
 422                         $s = (object)false;
 423                         $s->iw_url = '';
 424                         $s->iw_local = 0;
 425                         $s->iw_trans = 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          * Determine whether the object refers to a page within
 457          * this project and is transcludable.
 458          *
 459          * @return bool TRUE if this is transcludable
 460          * @access public
 461          */
 462         function isTrans() {
 463                 global $wgTitleInterwikiCache, $wgDBname;
 464
 465                 if ($this->mInterwiki == '' || !$this->isLocal())
 466                         return false;
 467                 # Make sure key is loaded into cache
 468                 $this->getInterwikiLink( $this->mInterwiki );
 469                 $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 470                 return (bool)($wgTitleInterwikiCache[$k]->iw_trans);
 471         }
 472
 473         /**
 474          * Update the page_touched field for an array of title objects
 475          * @todo Inefficient unless the IDs are already loaded into the
 476          *      link cache
 477          * @param array $titles an array of Title objects to be touched
 478          * @param string $timestamp the timestamp to use instead of the
 479          *      default current time
 480          * @static
 481          * @access public
 482          */
 483         function touchArray( $titles, $timestamp = '' ) {
 484                 global $wgUseFileCache;
 485
 486                 if ( count( $titles ) == 0 ) {
 487                         return;
 488                 }
 489                 $dbw =& wfGetDB( DB_MASTER );
 490                 if ( $timestamp == '' ) {
 491                         $timestamp = $dbw->timestamp();
 492                 }
 493                 $page = $dbw->tableName( 'page' );
 494                 /*
 495                 $sql = "UPDATE $page SET page_touched='{$timestamp}' WHERE page_id IN (";
 496                 $first = true;
 497
 498                 foreach ( $titles as $title ) {
 499                         if ( $wgUseFileCache ) {
 500                                 $cm = new CacheManager($title);
 501                                 @unlink($cm->fileCacheName());
 502                         }
 503
 504                         if ( ! $first ) {
 505                                 $sql .= ',';
 506                         }
 507                         $first = false;
 508                         $sql .= $title->getArticleID();
 509                 }
 510                 $sql .= ')';
 511                 if ( ! $first ) {
 512                         $dbw->query( $sql, 'Title::touchArray' );
 513                 }
 514                 */
 515                 // hack hack hack -- brion 2005-07-11. this was unfriendly to db.
 516                 // do them in small chunks:
 517                 $fname = 'Title::touchArray';
 518                 foreach( $titles as $title ) {
 519                         $dbw->update( 'page',
 520                                 array( 'page_touched' => $timestamp ),
 521                                 array(
 522                                         'page_namespace' => $title->getNamespace(),
 523                                         'page_title'     => $title->getDBkey() ),
 524                                 $fname );
 525                 }
 526         }
 527
 528 #----------------------------------------------------------------------------
 529 #       Other stuff
 530 #----------------------------------------------------------------------------
 531
 532         /** Simple accessors */
 533         /**
 534          * Get the text form (spaces not underscores) of the main part
 535          * @return string
 536          * @access public
 537          */
 538         function getText() { return $this->mTextform; }
 539         /**
 540          * Get the URL-encoded form of the main part
 541          * @return string
 542          * @access public
 543          */
 544         function getPartialURL() { return $this->mUrlform; }
 545         /**
 546          * Get the main part with underscores
 547          * @return string
 548          * @access public
 549          */
 550         function getDBkey() { return $this->mDbkeyform; }
 551         /**
 552          * Get the namespace index, i.e. one of the NS_xxxx constants
 553          * @return int
 554          * @access public
 555          */
 556         function getNamespace() { return $this->mNamespace; }
 557         /**
 558          * Get the namespace text
 559          * @return string
 560          * @access public
 561          */
 562         function getNsText() {
 563                 global $wgContLang;
 564                 return $wgContLang->getNsText( $this->mNamespace );
 565         }
 566         /**
 567          * Get the namespace text of the subject (rather than talk) page
 568          * @return string
 569          * @access public
 570          */
 571         function getSubjectNsText() {
 572                 global $wgContLang;
 573                 return $wgContLang->getNsText( Namespace::getSubject( $this->mNamespace ) );
 574         }
 575
 576         /**
 577          * Get the interwiki prefix (or null string)
 578          * @return string
 579          * @access public
 580          */
 581         function getInterwiki() { return $this->mInterwiki; }
 582         /**
 583          * Get the Title fragment (i.e. the bit after the #)
 584          * @return string
 585          * @access public
 586          */
 587         function getFragment() { return $this->mFragment; }
 588         /**
 589          * Get the default namespace index, for when there is no namespace
 590          * @return int
 591          * @access public
 592          */
 593         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 594
 595         /**
 596          * Get title for search index
 597          * @return string a stripped-down title string ready for the
 598          *      search index
 599          */
 600         function getIndexTitle() {
 601                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 602         }
 603
 604         /**
 605          * Get the prefixed database key form
 606          * @return string the prefixed title, with underscores and
 607          *      any interwiki and namespace prefixes
 608          * @access public
 609          */
 610         function getPrefixedDBkey() {
 611                 $s = $this->prefix( $this->mDbkeyform );
 612                 $s = str_replace( ' ', '_', $s );
 613                 return $s;
 614         }
 615
 616         /**
 617          * Get the prefixed title with spaces.
 618          * This is the form usually used for display
 619          * @return string the prefixed title, with spaces
 620          * @access public
 621          */
 622         function getPrefixedText() {
 623                 global $wgContLang;
 624                 if ( empty( $this->mPrefixedText ) ) {
 625                         $s = $this->prefix( $this->mTextform );
 626                         $s = str_replace( '_', ' ', $s );
 627                         $this->mPrefixedText = $s;
 628                 }
 629                 return $this->mPrefixedText;
 630         }
 631
 632         /**
 633          * Get the prefixed title with spaces, plus any fragment
 634          * (part beginning with '#')
 635          * @return string the prefixed title, with spaces and
 636          *      the fragment, including '#'
 637          * @access public
 638          */
 639         function getFullText() {
 640                 global $wgContLang;
 641                 $text = $this->getPrefixedText();
 642                 if( '' != $this->mFragment ) {
 643                         $text .= '#' . $this->mFragment;
 644                 }
 645                 return $text;
 646         }
 647
 648         /**
 649          * Get a URL-encoded title (not an actual URL) including interwiki
 650          * @return string the URL-encoded form
 651          * @access public
 652          */
 653         function getPrefixedURL() {
 654                 $s = $this->prefix( $this->mDbkeyform );
 655                 $s = str_replace( ' ', '_', $s );
 656
 657                 $s = wfUrlencode ( $s ) ;
 658
 659                 # Cleaning up URL to make it look nice -- is this safe?
 660                 $s = str_replace( '%28', '(', $s );
 661                 $s = str_replace( '%29', ')', $s );
 662
 663                 return $s;
 664         }
 665
 666         /**
 667          * Get a real URL referring to this title, with interwiki link and
 668          * fragment
 669          *
 670          * @param string $query an optional query string, not used
 671          *      for interwiki links
 672          * @return string the URL
 673          * @access public
 674          */
 675         function getFullURL( $query = '' ) {
 676                 global $wgContLang, $wgServer, $wgScript, $wgMakeDumpLinks, $wgArticlePath;
 677
 678                 if ( '' == $this->mInterwiki ) {
 679                         return $wgServer . $this->getLocalUrl( $query );
 680                 } elseif ( $wgMakeDumpLinks && $wgContLang->getLanguageName( $this->mInterwiki ) ) {
 681                         $baseUrl = str_replace( '$1', "../../{$this->mInterwiki}/$1", $wgArticlePath );
 682                         $baseUrl = str_replace( '$1', $this->getHashedDirectory() . '/$1', $baseUrl );
 683                 } else {
 684                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 685                 }
 686
 687                 $namespace = $wgContLang->getNsText( $this->mNamespace );
 688                 if ( '' != $namespace ) {
 689                         # Can this actually happen? Interwikis shouldn't be parsed.
 690                         $namespace .= ':';
 691                 }
 692                 $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 693                 if( $query != '' ) {
 694                         if( false === strpos( $url, '?' ) ) {
 695                                 $url .= '?';
 696                         } else {
 697                                 $url .= '&';
 698                         }
 699                         $url .= $query;
 700                 }
 701                 if ( '' != $this->mFragment ) {
 702                         $url .= '#' . $this->mFragment;
 703                 }
 704                 return $url;
 705         }
 706
 707         /**
 708          * Get a relative directory for putting an HTML version of this article into
 709          */
 710         function getHashedDirectory() {
 711                 global $wgMakeDumpLinks, $wgInputEncoding;
 712                 $dbkey = $this->getDBkey();
 713
 714                 # Split into characters
 715                 if ( $wgInputEncoding == 'UTF-8' ) {
 716                         preg_match_all( '/./us', $dbkey, $m );
 717                 } else {
 718                         preg_match_all( '/./s', $dbkey, $m );
 719                 }
 720                 $chars = $m[0];
 721                 $length = count( $chars );
 722                 $dir = '';
 723
 724                 for ( $i = 0; $i < $wgMakeDumpLinks; $i++ ) {
 725                         if ( $i ) {
 726                                 $dir .= '/';
 727                         }
 728                         if ( $i >= $length ) {
 729                                 $dir .= '_';
 730                         } elseif ( ord( $chars[$i] ) > 32 ) {
 731                                 $dir .= strtolower( $chars[$i] );
 732                         } else {
 733                                 $dir .= sprintf( "%02X", ord( $chars[$i] ) );
 734                         }
 735                 }
 736                 return $dir;
 737         }
 738
 739         function getHashedFilename() {
 740                 $dbkey = $this->getPrefixedDBkey();
 741                 $mainPage = Title::newMainPage();
 742                 if ( $mainPage->getPrefixedDBkey() == $dbkey ) {
 743                         return 'index.html';
 744                 }
 745
 746                 $dir = $this->getHashedDirectory();
 747
 748                 # Replace illegal charcters for Windows paths with underscores
 749                 $friendlyName = strtr( $dbkey, '/\\*?"<>|~', '_________' );
 750
 751                 # Work out lower case form. We assume we're on a system with case-insensitive
 752                 # filenames, so unless the case is of a special form, we have to disambiguate
 753                 $lowerCase = $this->prefix( ucfirst( strtolower( $this->getDBkey() ) ) );
 754
 755                 # Make it mostly unique
 756                 if ( $lowerCase != $friendlyName  ) {
 757                         $friendlyName .= '_' . substr(md5( $dbkey ), 0, 4);
 758                 }
 759                 # Handle colon specially by replacing it with tilde
 760                 # Thus we reduce the number of paths with hashes appended
 761                 $friendlyName = str_replace( ':', '~', $friendlyName );
 762                 return "$dir/$friendlyName.html";
 763         }
 764
 765         /**
 766          * Get a URL with no fragment or server name.  If this page is generated
 767          * with action=render, $wgServer is prepended.
 768          * @param string $query an optional query string; if not specified,
 769          *      $wgArticlePath will be used.
 770          * @return string the URL
 771          * @access public
 772          */
 773         function getLocalURL( $query = '' ) {
 774                 global $wgLang, $wgArticlePath, $wgScript, $wgMakeDumpLinks, $wgServer, $action;
 775
 776                 if ( $this->isExternal() ) {
 777                         return $this->getFullURL();
 778                 }
 779
 780                 $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 781                 if ( $wgMakeDumpLinks ) {
 782                         $url = str_replace( '$1', wfUrlencode( $this->getHashedFilename() ), $wgArticlePath );
 783                 } elseif ( $query == '' ) {
 784                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 785                 } else {
 786                         global $wgActionPaths;
 787                         if( !empty( $wgActionPaths ) &&
 788                                 preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) ) {
 789                                 $action = urldecode( $matches[2] );
 790                                 if( isset( $wgActionPaths[$action] ) ) {
 791                                         $query = $matches[1];
 792                                         if( isset( $matches[4] ) ) $query .= $matches[4];
 793                                         $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 794                                         if( $query != '' ) $url .= '?' . $query;
 795                                         return $url;
 796                                 }
 797                         }
 798                         if ( $query == '-' ) {
 799                                 $query = '';
 800                         }
 801                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 802                 }
 803
 804                 if ($action == 'render')
 805                         return $wgServer . $url;
 806                 else
 807                         return $url;
 808         }
 809
 810         /**
 811          * Get an HTML-escaped version of the URL form, suitable for
 812          * using in a link, without a server name or fragment
 813          * @param string $query an optional query string
 814          * @return string the URL
 815          * @access public
 816          */
 817         function escapeLocalURL( $query = '' ) {
 818                 return htmlspecialchars( $this->getLocalURL( $query ) );
 819         }
 820
 821         /**
 822          * Get an HTML-escaped version of the URL form, suitable for
 823          * using in a link, including the server name and fragment
 824          *
 825          * @return string the URL
 826          * @param string $query an optional query string
 827          * @access public
 828          */
 829         function escapeFullURL( $query = '' ) {
 830                 return htmlspecialchars( $this->getFullURL( $query ) );
 831         }
 832
 833         /**
 834          * Get the URL form for an internal link.
 835          * - Used in various Squid-related code, in case we have a different
 836          * internal hostname for the server from the exposed one.
 837          *
 838          * @param string $query an optional query string
 839          * @return string the URL
 840          * @access public
 841          */
 842         function getInternalURL( $query = '' ) {
 843                 global $wgInternalServer;
 844                 return $wgInternalServer . $this->getLocalURL( $query );
 845         }
 846
 847         /**
 848          * Get the edit URL for this Title
 849          * @return string the URL, or a null string if this is an
 850          *      interwiki link
 851          * @access public
 852          */
 853         function getEditURL() {
 854                 global $wgServer, $wgScript;
 855
 856                 if ( '' != $this->mInterwiki ) { return ''; }
 857                 $s = $this->getLocalURL( 'action=edit' );
 858
 859                 return $s;
 860         }
 861
 862         /**
 863          * Get the HTML-escaped displayable text form.
 864          * Used for the title field in <a> tags.
 865          * @return string the text, including any prefixes
 866          * @access public
 867          */
 868         function getEscapedText() {
 869                 return htmlspecialchars( $this->getPrefixedText() );
 870         }
 871
 872         /**
 873          * Is this Title interwiki?
 874          * @return boolean
 875          * @access public
 876          */
 877         function isExternal() { return ( '' != $this->mInterwiki ); }
 878
 879         /**
 880          * Does the title correspond to a protected article?
 881          * @param string $what the action the page is protected from,
 882          *      by default checks move and edit
 883          * @return boolean
 884          * @access public
 885          */
 886         function isProtected($action = '') {
 887                 if ( -1 == $this->mNamespace ) { return true; }
 888                 if($action == 'edit' || $action == '') {
 889                         $a = $this->getRestrictions("edit");
 890                         if ( in_array( 'sysop', $a ) ) { return true; }
 891                 }
 892                 if($action == 'move' || $action == '') {
 893                         $a = $this->getRestrictions("move");
 894                         if ( in_array( 'sysop', $a ) ) { return true; }
 895                 }
 896                 return false;
 897         }
 898
 899         /**
 900          * Is $wgUser is watching this page?
 901          * @return boolean
 902          * @access public
 903          */
 904         function userIsWatching() {
 905                 global $wgUser;
 906
 907                 if ( is_null( $this->mWatched ) ) {
 908                         if ( -1 == $this->mNamespace || 0 == $wgUser->getID()) {
 909                                 $this->mWatched = false;
 910                         } else {
 911                                 $this->mWatched = $wgUser->isWatched( $this );
 912                         }
 913                 }
 914                 return $this->mWatched;
 915         }
 916
 917         /**
 918          * Is $wgUser perform $action this page?
 919          * @param string $action action that permission needs to be checked for
 920          * @return boolean
 921          * @access private
 922          */
 923         function userCan($action) {
 924                 $fname = 'Title::userCanEdit';
 925                 wfProfileIn( $fname );
 926
 927                 global $wgUser;
 928                 if( NS_SPECIAL == $this->mNamespace ) {
 929                         wfProfileOut( $fname );
 930                         return false;
 931                 }
 932                 if( NS_MEDIAWIKI == $this->mNamespace &&
 933                     !$wgUser->isAllowed('editinterface') ) {
 934                         wfProfileOut( $fname );
 935                         return false;
 936                 }
 937                 if( $this->mDbkeyform == '_' ) {
 938                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
 939                         wfProfileOut( $fname );
 940                         return false;
 941                 }
 942
 943                 # protect global styles and js
 944                 if ( NS_MEDIAWIKI == $this->mNamespace
 945                  && preg_match("/\\.(css|js)$/", $this->mTextform )
 946                      && !$wgUser->isAllowed('editinterface') ) {
 947                         wfProfileOut( $fname );
 948                         return false;
 949                 }
 950
 951                 # protect css/js subpages of user pages
 952                 # XXX: this might be better using restrictions
 953                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
 954                 if( NS_USER == $this->mNamespace
 955                         && preg_match("/\\.(css|js)$/", $this->mTextform )
 956                         && !$wgUser->isAllowed('editinterface')
 957                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
 958                         wfProfileOut( $fname );
 959                         return false;
 960                 }
 961
 962                 foreach( $this->getRestrictions($action) as $right ) {
 963                         // Backwards compatibility, rewrite sysop -> protect
 964                         if ( $right == 'sysop' ) {
 965                                 $right = 'protect';
 966                         }
 967                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
 968                                 wfProfileOut( $fname );
 969                                 return false;
 970                         }
 971                 }
 972
 973                 if( $action == 'move' &&
 974                         !( $this->isMovable() && $wgUser->isAllowed( 'move' ) ) ) {
 975                         wfProfileOut( $fname );
 976                         return false;
 977                 }
 978
 979                 wfProfileOut( $fname );
 980                 return true;
 981         }
 982
 983         /**
 984          * Can $wgUser edit this page?
 985          * @return boolean
 986          * @access public
 987          */
 988         function userCanEdit() {
 989                 return $this->userCan('edit');
 990         }
 991
 992         /**
 993          * Can $wgUser move this page?
 994          * @return boolean
 995          * @access public
 996          */
 997         function userCanMove() {
 998                 return $this->userCan('move');
 999         }
1000
1001         /**
1002          * Would anybody with sufficient privileges be able to move this page?
1003          * Some pages just aren't movable.
1004          *
1005          * @return boolean
1006          * @access public
1007          */
1008         function isMovable() {
1009                 return Namespace::isMovable( $this->getNamespace() )
1010                         && $this->getInterwiki() == '';
1011         }
1012
1013         /**
1014          * Can $wgUser read this page?
1015          * @return boolean
1016          * @access public
1017          */
1018         function userCanRead() {
1019                 global $wgUser;
1020
1021                 if( $wgUser->isAllowed('read') ) {
1022                         return true;
1023                 } else {
1024                         global $wgWhitelistRead;
1025
1026                         /** If anon users can create an account,
1027                             they need to reach the login page first! */
1028                         if( $wgUser->isAllowed( 'createaccount' )
1029                             && $this->getNamespace() == NS_SPECIAL
1030                             && $this->getText() == 'Userlogin' ) {
1031                                 return true;
1032                         }
1033
1034                         /** some pages are explicitly allowed */
1035                         $name = $this->getPrefixedText();
1036                         if( $wgWhitelistRead && in_array( $name, $wgWhitelistRead ) ) {
1037                                 return true;
1038                         }
1039
1040                         # Compatibility with old settings
1041                         if( $wgWhitelistRead && $this->getNamespace() == NS_MAIN ) {
1042                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
1043                                         return true;
1044                                 }
1045                         }
1046                 }
1047                 return false;
1048         }
1049
1050         /**
1051          * Is this a talk page of some sort?
1052          * @return bool
1053          * @access public
1054          */
1055         function isTalkPage() {
1056                 return Namespace::isTalk( $this->getNamespace() );
1057         }
1058
1059         /**
1060          * Is this a .css or .js subpage of a user page?
1061          * @return bool
1062          * @access public
1063          */
1064         function isCssJsSubpage() {
1065                 return ( NS_USER == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
1066         }
1067         /**
1068          * Is this a .css subpage of a user page?
1069          * @return bool
1070          * @access public
1071          */
1072         function isCssSubpage() {
1073                 return ( NS_USER == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
1074         }
1075         /**
1076          * Is this a .js subpage of a user page?
1077          * @return bool
1078          * @access public
1079          */
1080         function isJsSubpage() {
1081                 return ( NS_USER == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
1082         }
1083         /**
1084          * Protect css/js subpages of user pages: can $wgUser edit
1085          * this page?
1086          *
1087          * @return boolean
1088          * @todo XXX: this might be better using restrictions
1089          * @access public
1090          */
1091         function userCanEditCssJsSubpage() {
1092                 global $wgUser;
1093                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1094         }
1095
1096         /**
1097          * Loads a string into mRestrictions array
1098          * @param string $res restrictions in string format
1099          * @access public
1100          */
1101         function loadRestrictions( $res ) {
1102                 foreach( explode( ':', trim( $res ) ) as $restrict ) {
1103                         $temp = explode( '=', trim( $restrict ) );
1104                         if(count($temp) == 1) {
1105                                 // old format should be treated as edit/move restriction
1106                                 $this->mRestrictions["edit"] = explode( ',', trim( $temp[0] ) );
1107                                 $this->mRestrictions["move"] = explode( ',', trim( $temp[0] ) );
1108                         } else {
1109                                 $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1110                         }
1111                 }
1112                 $this->mRestrictionsLoaded = true;
1113         }
1114
1115         /**
1116          * Accessor/initialisation for mRestrictions
1117          * @param string $action action that permission needs to be checked for
1118          * @return array the array of groups allowed to edit this article
1119          * @access public
1120          */
1121         function getRestrictions($action) {
1122                 $id = $this->getArticleID();
1123                 if ( 0 == $id ) { return array(); }
1124
1125                 if ( ! $this->mRestrictionsLoaded ) {
1126                         $dbr =& wfGetDB( DB_SLAVE );
1127                         $res = $dbr->selectField( 'page', 'page_restrictions', 'page_id='.$id );
1128                         $this->loadRestrictions( $res );
1129                 }
1130                 if( isset( $this->mRestrictions[$action] ) ) {
1131                         return $this->mRestrictions[$action];
1132                 }
1133                 return array();
1134         }
1135
1136         /**
1137          * Is there a version of this page in the deletion archive?
1138          * @return int the number of archived revisions
1139          * @access public
1140          */
1141         function isDeleted() {
1142                 $fname = 'Title::isDeleted';
1143                 if ( $this->getNamespace() < 0 ) {
1144                         $n = 0;
1145                 } else {
1146                         $dbr =& wfGetDB( DB_SLAVE );
1147                         $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1148                                 'ar_title' => $this->getDBkey() ), $fname );
1149                 }
1150                 return (int)$n;
1151         }
1152
1153         /**
1154          * Get the article ID for this Title from the link cache,
1155          * adding it if necessary
1156          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1157          *      for update
1158          * @return int the ID
1159          * @access public
1160          */
1161         function getArticleID( $flags = 0 ) {
1162                 global $wgLinkCache;
1163                 if ( $flags & GAID_FOR_UPDATE ) {
1164                         $oldUpdate = $wgLinkCache->forUpdate( true );
1165                         $this->mArticleID = $wgLinkCache->addLinkObj( $this );
1166                         $wgLinkCache->forUpdate( $oldUpdate );
1167                 } else {
1168                         if ( -1 == $this->mArticleID ) {
1169                                 $this->mArticleID = $wgLinkCache->addLinkObj( $this );
1170                         }
1171                 }
1172                 return $this->mArticleID;
1173         }
1174
1175         function getLatestRevID() {
1176                 if ($this->mLatestID !== false)
1177                         return $this->mLatestID;
1178
1179                 $db =& wfGetDB(DB_SLAVE);
1180                 return $this->mLatestID = $db->selectField( 'revision',
1181                         "max(rev_id)",
1182                         array('rev_page' => $this->getArticleID()),
1183                         'Title::getLatestRevID' );
1184         }
1185
1186         /**
1187          * This clears some fields in this object, and clears any associated
1188          * keys in the "bad links" section of $wgLinkCache.
1189          *
1190          * - This is called from Article::insertNewArticle() to allow
1191          * loading of the new page_id. It's also called from
1192          * Article::doDeleteArticle()
1193          *
1194          * @param int $newid the new Article ID
1195          * @access public
1196          */
1197         function resetArticleID( $newid ) {
1198                 global $wgLinkCache;
1199                 $wgLinkCache->clearBadLink( $this->getPrefixedDBkey() );
1200
1201                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1202                 else { $this->mArticleID = $newid; }
1203                 $this->mRestrictionsLoaded = false;
1204                 $this->mRestrictions = array();
1205         }
1206
1207         /**
1208          * Updates page_touched for this page; called from LinksUpdate.php
1209          * @return bool true if the update succeded
1210          * @access public
1211          */
1212         function invalidateCache() {
1213                 global $wgUseFileCache;
1214
1215                 if ( wfReadOnly() ) {
1216                         return;
1217                 }
1218
1219                 $now = wfTimestampNow();
1220                 $dbw =& wfGetDB( DB_MASTER );
1221                 $success = $dbw->update( 'page',
1222                         array( /* SET */
1223                                 'page_touched' => $dbw->timestamp()
1224                         ), array( /* WHERE */
1225                                 'page_namespace' => $this->getNamespace() ,
1226                                 'page_title' => $this->getDBkey()
1227                         ), 'Title::invalidateCache'
1228                 );
1229
1230                 if ($wgUseFileCache) {
1231                         $cache = new CacheManager($this);
1232                         @unlink($cache->fileCacheName());
1233                 }
1234
1235                 return $success;
1236         }
1237
1238         /**
1239          * Prefix some arbitrary text with the namespace or interwiki prefix
1240          * of this object
1241          *
1242          * @param string $name the text
1243          * @return string the prefixed text
1244          * @access private
1245          */
1246         /* private */ function prefix( $name ) {
1247                 global $wgContLang;
1248
1249                 $p = '';
1250                 if ( '' != $this->mInterwiki ) {
1251                         $p = $this->mInterwiki . ':';
1252                 }
1253                 if ( 0 != $this->mNamespace ) {
1254                         $p .= $wgContLang->getNsText( $this->mNamespace ) . ':';
1255                 }
1256                 return $p . $name;
1257         }
1258
1259         /**
1260          * Secure and split - main initialisation function for this object
1261          *
1262          * Assumes that mDbkeyform has been set, and is urldecoded
1263          * and uses underscores, but not otherwise munged.  This function
1264          * removes illegal characters, splits off the interwiki and
1265          * namespace prefixes, sets the other forms, and canonicalizes
1266          * everything.
1267          * @return bool true on success
1268          * @access private
1269          */
1270         /* private */ function secureAndSplit() {
1271                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1272                 $fname = 'Title::secureAndSplit';
1273                 wfProfileIn( $fname );
1274
1275                 # Initialisation
1276                 static $rxTc = false;
1277                 if( !$rxTc ) {
1278                         # % is needed as well
1279                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/S';
1280                 }
1281
1282                 $this->mInterwiki = $this->mFragment = '';
1283                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1284
1285                 # Clean up whitespace
1286                 #
1287                 $t = preg_replace( '/[ _]+/', '_', $this->mDbkeyform );
1288                 $t = trim( $t, '_' );
1289
1290                 if ( '' == $t ) {
1291                         wfProfileOut( $fname );
1292                         return false;
1293                 }
1294
1295                 if( false !== strpos( $t, UTF8_REPLACEMENT ) ) {
1296                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1297                         wfProfileOut( $fname );
1298                         return false;
1299                 }
1300
1301                 $this->mDbkeyform = $t;
1302
1303                 # Initial colon indicates main namespace rather than specified default
1304                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
1305                 if ( ':' == $t{0} ) {
1306                         $this->mNamespace = NS_MAIN;
1307                         $t = substr( $t, 1 ); # remove the colon but continue processing
1308                 }
1309
1310                 # Namespace or interwiki prefix
1311                 $firstPass = true;
1312                 do {
1313                         if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $t, $m ) ) {
1314                                 $p = $m[1];
1315                                 $lowerNs = strtolower( $p );
1316                                 if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1317                                         # Canonical namespace
1318                                         $t = $m[2];
1319                                         $this->mNamespace = $ns;
1320                                 } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1321                                         # Ordinary namespace
1322                                         $t = $m[2];
1323                                         $this->mNamespace = $ns;
1324                                 } elseif( $this->getInterwikiLink( $p ) ) {
1325                                         if( !$firstPass ) {
1326                                                 # Can't make a local interwiki link to an interwiki link.
1327                                                 # That's just crazy!
1328                                                 wfProfileOut( $fname );
1329                                                 return false;
1330                                         }
1331
1332                                         # Interwiki link
1333                                         $t = $m[2];
1334                                         $this->mInterwiki = $p;
1335
1336                                         # Redundant interwiki prefix to the local wiki
1337                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1338                                                 if( $t == '' ) {
1339                                                         # Can't have an empty self-link
1340                                                         wfProfileOut( $fname );
1341                                                         return false;
1342                                                 }
1343                                                 $this->mInterwiki = '';
1344                                                 $firstPass = false;
1345                                                 # Do another namespace split...
1346                                                 continue;
1347                                         }
1348                                 }
1349                                 # If there's no recognized interwiki or namespace,
1350                                 # then let the colon expression be part of the title.
1351                         }
1352                         break;
1353                 } while( true );
1354                 $r = $t;
1355
1356                 # We already know that some pages won't be in the database!
1357                 #
1358                 if ( '' != $this->mInterwiki || -1 == $this->mNamespace ) {
1359                         $this->mArticleID = 0;
1360                 }
1361                 $f = strstr( $r, '#' );
1362                 if ( false !== $f ) {
1363                         $this->mFragment = substr( $f, 1 );
1364                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
1365                         # remove whitespace again: prevents "Foo_bar_#"
1366                         # becoming "Foo_bar_"
1367                         $r = preg_replace( '/_*$/', '', $r );
1368                 }
1369
1370                 # Reject illegal characters.
1371                 #
1372                 if( preg_match( $rxTc, $r ) ) {
1373                         wfProfileOut( $fname );
1374                         return false;
1375                 }
1376
1377                 /**
1378                  * Pages with "/./" or "/../" appearing in the URLs will
1379                  * often be unreachable due to the way web browsers deal
1380                  * with 'relative' URLs. Forbid them explicitly.
1381                  */
1382                 if ( strpos( $r, '.' ) !== false &&
1383                      ( $r === '.' || $r === '..' ||
1384                        strpos( $r, './' ) === 0  ||
1385                        strpos( $r, '../' ) === 0 ||
1386                        strpos( $r, '/./' ) !== false ||
1387                        strpos( $r, '/../' ) !== false ) )
1388                 {
1389                         wfProfileOut( $fname );
1390                         return false;
1391                 }
1392
1393                 # We shouldn't need to query the DB for the size.
1394                 #$maxSize = $dbr->textFieldSize( 'page', 'page_title' );
1395                 if ( strlen( $r ) > 255 ) {
1396                         wfProfileOut( $fname );
1397                         return false;
1398                 }
1399
1400                 /**
1401                  * Normally, all wiki links are forced to have
1402                  * an initial capital letter so [[foo]] and [[Foo]]
1403                  * point to the same place.
1404                  *
1405                  * Don't force it for interwikis, since the other
1406                  * site might be case-sensitive.
1407                  */
1408                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1409                         $t = $wgContLang->ucfirst( $r );
1410                 } else {
1411                         $t = $r;
1412                 }
1413
1414                 /**
1415                  * Can't make a link to a namespace alone...
1416                  * "empty" local links can only be self-links
1417                  * with a fragment identifier.
1418                  */
1419                 if( $t == '' &&
1420                         $this->mInterwiki == '' &&
1421                         $this->mNamespace != NS_MAIN ) {
1422                         wfProfileOut( $fname );
1423                         return false;
1424                 }
1425
1426                 # Fill fields
1427                 $this->mDbkeyform = $t;
1428                 $this->mUrlform = wfUrlencode( $t );
1429
1430                 $this->mTextform = str_replace( '_', ' ', $t );
1431
1432                 wfProfileOut( $fname );
1433                 return true;
1434         }
1435
1436         /**
1437          * Get a Title object associated with the talk page of this article
1438          * @return Title the object for the talk page
1439          * @access public
1440          */
1441         function getTalkPage() {
1442                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1443         }
1444
1445         /**
1446          * Get a title object associated with the subject page of this
1447          * talk page
1448          *
1449          * @return Title the object for the subject page
1450          * @access public
1451          */
1452         function getSubjectPage() {
1453                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1454         }
1455
1456         /**
1457          * Get an array of Title objects linking to this Title
1458          * Also stores the IDs in the link cache.
1459          *
1460          * @param string $options may be FOR UPDATE
1461          * @return array the Title objects linking here
1462          * @access public
1463          */
1464         function getLinksTo( $options = '' ) {
1465                 global $wgLinkCache;
1466                 $id = $this->getArticleID();
1467
1468                 if ( $options ) {
1469                         $db =& wfGetDB( DB_MASTER );
1470                 } else {
1471                         $db =& wfGetDB( DB_SLAVE );
1472                 }
1473
1474                 $res = $db->select( array( 'page', 'pagelinks' ),
1475                         array( 'page_namespace', 'page_title', 'page_id' ),
1476                         array(
1477                                 'pl_from=page_id',
1478                                 'pl_namespace' => $this->getNamespace(),
1479                                 'pl_title'     => $this->getDbKey() ),
1480                         'Title::getLinksTo',
1481                         $options );
1482
1483                 $retVal = array();
1484                 if ( $db->numRows( $res ) ) {
1485                         while ( $row = $db->fetchObject( $res ) ) {
1486                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1487                                         $wgLinkCache->addGoodLinkObj( $row->page_id, $titleObj );
1488                                         $retVal[] = $titleObj;
1489                                 }
1490                         }
1491                 }
1492                 $db->freeResult( $res );
1493                 return $retVal;
1494         }
1495
1496         /**
1497          * Get an array of Title objects referring to non-existent articles linked from this page
1498          *
1499          * @param string $options may be FOR UPDATE
1500          * @return array the Title objects
1501          * @access public
1502          */
1503         function getBrokenLinksFrom( $options = '' ) {
1504                 global $wgLinkCache;
1505
1506                 if ( $options ) {
1507                         $db =& wfGetDB( DB_MASTER );
1508                 } else {
1509                         $db =& wfGetDB( DB_SLAVE );
1510                 }
1511
1512                 $res = $db->safeQuery(
1513                           "SELECT pl_namespace, pl_title
1514                              FROM !
1515                         LEFT JOIN !
1516                                ON pl_namespace=page_namespace
1517                               AND pl_title=page_title
1518                             WHERE pl_from=?
1519                               AND page_namespace IS NULL
1520                                   !",
1521                         $db->tableName( 'pagelinks' ),
1522                         $db->tableName( 'page' ),
1523                         $this->getArticleId(),
1524                         $options );
1525
1526                 $retVal = array();
1527                 if ( $db->numRows( $res ) ) {
1528                         while ( $row = $db->fetchObject( $res ) ) {
1529                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
1530                         }
1531                 }
1532                 $db->freeResult( $res );
1533                 return $retVal;
1534         }
1535
1536
1537         /**
1538          * Get a list of URLs to purge from the Squid cache when this
1539          * page changes
1540          *
1541          * @return array the URLs
1542          * @access public
1543          */
1544         function getSquidURLs() {
1545                 return array(
1546                         $this->getInternalURL(),
1547                         $this->getInternalURL( 'action=history' )
1548                 );
1549         }
1550
1551         /**
1552          * Move this page without authentication
1553          * @param Title &$nt the new page Title
1554          * @access public
1555          */
1556         function moveNoAuth( &$nt ) {
1557                 return $this->moveTo( $nt, false );
1558         }
1559
1560         /**
1561          * Check whether a given move operation would be valid.
1562          * Returns true if ok, or a message key string for an error message
1563          * if invalid. (Scarrrrry ugly interface this.)
1564          * @param Title &$nt the new title
1565          * @param bool $auth indicates whether $wgUser's permissions
1566          *      should be checked
1567          * @return mixed true on success, message name on failure
1568          * @access public
1569          */
1570         function isValidMoveOperation( &$nt, $auth = true, $reason = '' ) {
1571                 global $wgUser;
1572                 if( !$this or !$nt ) {
1573                         return 'badtitletext';
1574                 }
1575                 if( $this->equals( $nt ) ) {
1576                         return 'selfmove';
1577                 }
1578                 if( !$this->isMovable() || !$nt->isMovable() ) {
1579                         return 'immobile_namespace';
1580                 }
1581
1582                 $fname = 'Title::move';
1583                 $oldid = $this->getArticleID();
1584                 $newid = $nt->getArticleID();
1585
1586                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1587                         return 'articleexists';
1588                 }
1589                 if ( ( '' == $this->getDBkey() ) ||
1590                          ( !$oldid ) ||
1591                      ( '' == $nt->getDBkey() ) ) {
1592                         return 'badarticleerror';
1593                 }
1594
1595                 if ( $auth && (
1596                                 !$this->userCanEdit() || !$nt->userCanEdit() ||
1597                                 !$this->userCanMove() || !$nt->userCanMove() ) ) {
1598                         return 'protectedpage';
1599                 }
1600
1601                 # The move is allowed only if (1) the target doesn't exist, or
1602                 # (2) the target is a redirect to the source, and has no history
1603                 # (so we can undo bad moves right after they're done).
1604
1605                 if ( 0 != $newid ) { # Target exists; check for validity
1606                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1607                                 return 'articleexists';
1608                         }
1609                 }
1610                 return true;
1611         }
1612
1613         /**
1614          * Move a title to a new location
1615          * @param Title &$nt the new title
1616          * @param bool $auth indicates whether $wgUser's permissions
1617          *      should be checked
1618          * @return mixed true on success, message name on failure
1619          * @access public
1620          */
1621         function moveTo( &$nt, $auth = true, $reason = '' ) {
1622                 $err = $this->isValidMoveOperation( $nt, $auth, $reason );
1623                 if( is_string( $err ) ) {
1624                         return $err;
1625                 }
1626
1627                 $pageid = $this->getArticleID();
1628                 if( $nt->exists() ) {
1629                         $this->moveOverExistingRedirect( $nt, $reason );
1630                         $pageCountChange = 0;
1631                 } else { # Target didn't exist, do normal move.
1632                         $this->moveToNewTitle( $nt, $newid, $reason );
1633                         $pageCountChange = 1;
1634                 }
1635                 $redirid = $this->getArticleID();
1636
1637                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
1638                 $dbw =& wfGetDB( DB_MASTER );
1639                 $categorylinks = $dbw->tableName( 'categorylinks' );
1640                 $sql = "UPDATE $categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
1641                         " WHERE cl_from=" . $dbw->addQuotes( $pageid ) .
1642                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
1643                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
1644
1645                 # Update watchlists
1646
1647                 $oldnamespace = $this->getNamespace() & ~1;
1648                 $newnamespace = $nt->getNamespace() & ~1;
1649                 $oldtitle = $this->getDBkey();
1650                 $newtitle = $nt->getDBkey();
1651
1652                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
1653                         WatchedItem::duplicateEntries( $this, $nt );
1654                 }
1655
1656                 # Update search engine
1657                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
1658                 $u->doUpdate();
1659                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
1660                 $u->doUpdate();
1661
1662                 # Update site_stats
1663                 if ( $this->getNamespace() == NS_MAIN and $nt->getNamespace() != NS_MAIN ) {
1664                         # Moved out of main namespace
1665                         # not viewed, edited, removing
1666                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange);
1667                 } elseif ( $this->getNamespace() != NS_MAIN and $nt->getNamespace() == NS_MAIN ) {
1668                         # Moved into main namespace
1669                         # not viewed, edited, adding
1670                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
1671                 } elseif ( $pageCountChange ) {
1672                         # Added redirect
1673                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
1674                 } else{
1675                         $u = false;
1676                 }
1677                 if ( $u ) {
1678                         $u->doUpdate();
1679                 }
1680
1681                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
1682                 return true;
1683         }
1684
1685         /**
1686          * Move page to a title which is at present a redirect to the
1687          * source page
1688          *
1689          * @param Title &$nt the page to move to, which should currently
1690          *      be a redirect
1691          * @access private
1692          */
1693         function moveOverExistingRedirect( &$nt, $reason = '' ) {
1694                 global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
1695                 $fname = 'Title::moveOverExistingRedirect';
1696                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1697
1698                 if ( $reason ) {
1699                         $comment .= ": $reason";
1700                 }
1701
1702                 $now = wfTimestampNow();
1703                 $rand = wfRandom();
1704                 $newid = $nt->getArticleID();
1705                 $oldid = $this->getArticleID();
1706                 $dbw =& wfGetDB( DB_MASTER );
1707                 $links = $dbw->tableName( 'links' );
1708
1709                 # Delete the old redirect. We don't save it to history since
1710                 # by definition if we've got here it's rather uninteresting.
1711                 # We have to remove it so that the next step doesn't trigger
1712                 # a conflict on the unique namespace+title index...
1713                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
1714
1715                 # Save a null revision in the page's history notifying of the move
1716                 $nullRevision = Revision::newNullRevision( $dbw, $oldid,
1717                         wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() ),
1718                         true );
1719                 $nullRevId = $nullRevision->insertOn( $dbw );
1720
1721                 # Change the name of the target page:
1722                 $dbw->update( 'page',
1723                         /* SET */ array(
1724                                 'page_touched'   => $dbw->timestamp($now),
1725                                 'page_namespace' => $nt->getNamespace(),
1726                                 'page_title'     => $nt->getDBkey(),
1727                                 'page_latest'    => $nullRevId,
1728                         ),
1729                         /* WHERE */ array( 'page_id' => $oldid ),
1730                         $fname
1731                 );
1732                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1733
1734                 # Recreate the redirect, this time in the other direction.
1735                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1736                 $redirectArticle = new Article( $this );
1737                 $newid = $redirectArticle->insertOn( $dbw );
1738                 $redirectRevision = new Revision( array(
1739                         'page'    => $newid,
1740                         'comment' => $comment,
1741                         'text'    => $redirectText ) );
1742                 $revid = $redirectRevision->insertOn( $dbw );
1743                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1744                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1745
1746                 # Log the move
1747                 $log = new LogPage( 'move' );
1748                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
1749
1750                 # Now, we record the link from the redirect to the new title.
1751                 # It should have no other outgoing links...
1752                 $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
1753                 $dbw->insert( 'pagelinks',
1754                         array(
1755                                 'pl_from'      => $newid,
1756                                 'pl_namespace' => $nt->getNamespace(),
1757                                 'pl_title'     => $nt->getDbKey() ),
1758                         $fname );
1759
1760                 # Purge squid
1761                 if ( $wgUseSquid ) {
1762                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1763                         $u = new SquidUpdate( $urls );
1764                         $u->doUpdate();
1765                 }
1766         }
1767
1768         /**
1769          * Move page to non-existing title.
1770          * @param Title &$nt the new Title
1771          * @param int &$newid set to be the new article ID
1772          * @access private
1773          */
1774         function moveToNewTitle( &$nt, &$newid, $reason = '' ) {
1775                 global $wgUser, $wgLinkCache, $wgUseSquid;
1776                 global $wgMwRedir;
1777                 $fname = 'MovePageForm::moveToNewTitle';
1778                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1779                 if ( $reason ) {
1780                         $comment .= ": $reason";
1781                 }
1782
1783                 $newid = $nt->getArticleID();
1784                 $oldid = $this->getArticleID();
1785                 $dbw =& wfGetDB( DB_MASTER );
1786                 $now = $dbw->timestamp();
1787                 wfSeedRandom();
1788                 $rand = wfRandom();
1789
1790                 # Save a null revision in the page's history notifying of the move
1791                 $nullRevision = Revision::newNullRevision( $dbw, $oldid,
1792                         wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() ),
1793                         true );
1794                 $nullRevId = $nullRevision->insertOn( $dbw );
1795
1796                 # Rename cur entry
1797                 $dbw->update( 'page',
1798                         /* SET */ array(
1799                                 'page_touched'   => $now,
1800                                 'page_namespace' => $nt->getNamespace(),
1801                                 'page_title'     => $nt->getDBkey(),
1802                                 'page_latest'    => $nullRevId,
1803                         ),
1804                         /* WHERE */ array( 'page_id' => $oldid ),
1805                         $fname
1806                 );
1807
1808                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1809
1810                 # Insert redirect
1811                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1812                 $redirectArticle = new Article( $this );
1813                 $newid = $redirectArticle->insertOn( $dbw );
1814                 $redirectRevision = new Revision( array(
1815                         'page'    => $newid,
1816                         'comment' => $comment,
1817                         'text'    => $redirectText ) );
1818                 $revid = $redirectRevision->insertOn( $dbw );
1819                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1820                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1821
1822                 # Log the move
1823                 $log = new LogPage( 'move' );
1824                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
1825
1826                 # Purge caches as per article creation
1827                 Article::onArticleCreate( $nt );
1828
1829                 # Record the just-created redirect's linking to the page
1830                 $dbw->insert( 'pagelinks',
1831                         array(
1832                                 'pl_from'      => $newid,
1833                                 'pl_namespace' => $nt->getNamespace(),
1834                                 'pl_title'     => $nt->getDBkey() ),
1835                         $fname );
1836
1837                 # Non-existent target may have had broken links to it; these must
1838                 # now be touched to update link coloring.
1839                 $nt->touchLinks();
1840
1841                 # Purge old title from squid
1842                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1843                 $titles = $nt->getLinksTo();
1844                 if ( $wgUseSquid ) {
1845                         $urls = $this->getSquidURLs();
1846                         foreach ( $titles as $linkTitle ) {
1847                                 $urls[] = $linkTitle->getInternalURL();
1848                         }
1849                         $u = new SquidUpdate( $urls );
1850                         $u->doUpdate();
1851                 }
1852         }
1853
1854         /**
1855          * Checks if $this can be moved to a given Title
1856          * - Selects for update, so don't call it unless you mean business
1857          *
1858          * @param Title &$nt the new title to check
1859          * @access public
1860          */
1861         function isValidMoveTarget( $nt ) {
1862
1863                 $fname = 'Title::isValidMoveTarget';
1864                 $dbw =& wfGetDB( DB_MASTER );
1865
1866                 # Is it a redirect?
1867                 $id  = $nt->getArticleID();
1868                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
1869                         array( 'page_is_redirect','old_text' ),
1870                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
1871                         $fname, 'FOR UPDATE' );
1872
1873                 if ( !$obj || 0 == $obj->page_is_redirect ) {
1874                         # Not a redirect
1875                         return false;
1876                 }
1877
1878                 # Does the redirect point to the source?
1879                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $obj->old_text, $m ) ) {
1880                         $redirTitle = Title::newFromText( $m[1] );
1881                         if( !is_object( $redirTitle ) ||
1882                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1883                                 return false;
1884                         }
1885                 }
1886
1887                 # Does the article have a history?
1888                 $row = $dbw->selectRow( array( 'page', 'revision'),
1889                         array( 'rev_id' ),
1890                         array( 'page_namespace' => $nt->getNamespace(),
1891                                 'page_title' => $nt->getDBkey(),
1892                                 'page_id=rev_page AND page_latest != rev_id'
1893                         ), $fname, 'FOR UPDATE'
1894                 );
1895
1896                 # Return true if there was no history
1897                 return $row === false;
1898         }
1899
1900         /**
1901          * Create a redirect; fails if the title already exists; does
1902          * not notify RC
1903          *
1904          * @param Title $dest the destination of the redirect
1905          * @param string $comment the comment string describing the move
1906          * @return bool true on success
1907          * @access public
1908          */
1909         function createRedirect( $dest, $comment ) {
1910                 global $wgUser;
1911                 if ( $this->getArticleID() ) {
1912                         return false;
1913                 }
1914
1915                 $fname = 'Title::createRedirect';
1916                 $dbw =& wfGetDB( DB_MASTER );
1917
1918                 $article = new Article( $this );
1919                 $newid = $article->insertOn( $dbw );
1920                 $revision = new Revision( array(
1921                         'page'      => $newid,
1922                         'comment'   => $comment,
1923                         'text'      => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n",
1924                         ) );
1925                 $revisionId = $revision->insertOn( $dbw );
1926                 $article->updateRevisionOn( $dbw, $revision, 0 );
1927
1928                 # Link table
1929                 $dbw->insert( 'pagelinks',
1930                         array(
1931                                 'pl_from'      => $newid,
1932                                 'pl_namespace' => $dest->getNamespace(),
1933                                 'pl_title'     => $dest->getDbKey()
1934                         ), $fname
1935                 );
1936
1937                 Article::onArticleCreate( $this );
1938                 return true;
1939         }
1940
1941         /**
1942          * Get categories to which this Title belongs and return an array of
1943          * categories' names.
1944          *
1945          * @return array an array of parents in the form:
1946          *      $parent => $currentarticle
1947          * @access public
1948          */
1949         function getParentCategories() {
1950                 global $wgContLang,$wgUser;
1951
1952                 $titlekey = $this->getArticleId();
1953                 $sk =& $wgUser->getSkin();
1954                 $parents = array();
1955                 $dbr =& wfGetDB( DB_SLAVE );
1956                 $categorylinks = $dbr->tableName( 'categorylinks' );
1957
1958                 # NEW SQL
1959                 $sql = "SELECT * FROM $categorylinks"
1960                      ." WHERE cl_from='$titlekey'"
1961                          ." AND cl_from <> '0'"
1962                          ." ORDER BY cl_sortkey";
1963
1964                 $res = $dbr->query ( $sql ) ;
1965
1966                 if($dbr->numRows($res) > 0) {
1967                         while ( $x = $dbr->fetchObject ( $res ) )
1968                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
1969                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
1970                         $dbr->freeResult ( $res ) ;
1971                 } else {
1972                         $data = '';
1973                 }
1974                 return $data;
1975         }
1976
1977         /**
1978          * Get a tree of parent categories
1979          * @param array $children an array with the children in the keys, to check for circular refs
1980          * @return array
1981          * @access public
1982          */
1983         function getParentCategoryTree( $children = array() ) {
1984                 $parents = $this->getParentCategories();
1985
1986                 if($parents != '') {
1987                         foreach($parents as $parent => $current)
1988                         {
1989                                 if ( array_key_exists( $parent, $children ) ) {
1990                                         # Circular reference
1991                                         $stack[$parent] = array();
1992                                 } else {
1993                                         $nt = Title::newFromText($parent);
1994                                         $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
1995                                 }
1996                         }
1997                         return $stack;
1998                 } else {
1999                         return array();
2000                 }
2001         }
2002
2003
2004         /**
2005          * Get an associative array for selecting this title from
2006          * the "cur" table
2007          *
2008          * @return array
2009          * @access public
2010          */
2011         function curCond() {
2012                 wfDebugDieBacktrace( 'curCond called' );
2013                 return array( 'cur_namespace' => $this->mNamespace, 'cur_title' => $this->mDbkeyform );
2014         }
2015
2016         /**
2017          * Get an associative array for selecting this title from the
2018          * "old" table
2019          *
2020          * @return array
2021          * @access public
2022          */
2023         function oldCond() {
2024                 wfDebugDieBacktrace( 'oldCond called' );
2025                 return array( 'old_namespace' => $this->mNamespace, 'old_title' => $this->mDbkeyform );
2026         }
2027
2028         /**
2029          * Get the revision ID of the previous revision
2030          *
2031          * @param integer $revision  Revision ID. Get the revision that was before this one.
2032          * @return interger $oldrevision|false
2033          */
2034         function getPreviousRevisionID( $revision ) {
2035                 $dbr =& wfGetDB( DB_SLAVE );
2036                 return $dbr->selectField( 'revision', 'rev_id',
2037                         'rev_page=' . intval( $this->getArticleId() ) .
2038                         ' AND rev_id<' . intval( $revision ) . ' ORDER BY rev_id DESC' );
2039         }
2040
2041         /**
2042          * Get the revision ID of the next revision
2043          *
2044          * @param integer $revision  Revision ID. Get the revision that was after this one.
2045          * @return interger $oldrevision|false
2046          */
2047         function getNextRevisionID( $revision ) {
2048                 $dbr =& wfGetDB( DB_SLAVE );
2049                 return $dbr->selectField( 'revision', 'rev_id',
2050                         'rev_page=' . intval( $this->getArticleId() ) .
2051                         ' AND rev_id>' . intval( $revision ) . ' ORDER BY rev_id' );
2052         }
2053
2054         /**
2055          * Compare with another title.
2056          *
2057          * @param Title $title
2058          * @return bool
2059          */
2060         function equals( &$title ) {
2061                 return $this->getInterwiki() == $title->getInterwiki()
2062                         && $this->getNamespace() == $title->getNamespace()
2063                         && $this->getDbkey() == $title->getDbkey();
2064         }
2065
2066         /**
2067          * Check if page exists
2068          * @return bool
2069          */
2070         function exists() {
2071                 return $this->getArticleId() != 0;
2072         }
2073
2074         /**
2075          * Should a link should be displayed as a known link, just based on its title?
2076          *
2077          * Currently, a self-link with a fragment, special pages and image pages are in
2078          * this category. Special pages never exist in the database. Some images do not
2079          * have description pages in the database, but the description page contains
2080          * useful history information that the user may want to link to.
2081          */
2082         function isAlwaysKnown() {
2083                 return  $this->isExternal() || ( 0 == $this->mNamespace && "" == $this->mDbkeyform )
2084                   || NS_SPECIAL == $this->mNamespace || NS_IMAGE == $this->mNamespace;
2085         }
2086
2087         /**
2088          * Update page_touched timestamps on pages linking to this title.
2089          * In principal, this could be backgrounded and could also do squid
2090          * purging.
2091          */
2092         function touchLinks() {
2093                 $fname = 'Title::touchLinks';
2094
2095                 $dbw =& wfGetDB( DB_MASTER );
2096
2097                 $res = $dbw->select( 'pagelinks',
2098                         array( 'pl_from' ),
2099                         array(
2100                                 'pl_namespace' => $this->getNamespace(),
2101                                 'pl_title'     => $this->getDbKey() ),
2102                         $fname );
2103                 if ( 0 == $dbw->numRows( $res ) ) {
2104                         return;
2105                 }
2106
2107                 $arr = array();
2108                 $toucharr = array();
2109                 while( $row = $dbw->fetchObject( $res ) ) {
2110                         $toucharr[] = $row->pl_from;
2111                 }
2112                 if (!count($toucharr))
2113                         return;
2114                 $dbw->update( 'page', /* SET */ array( 'page_touched' => $dbw->timestamp() ),
2115                                                         /* WHERE */ array( 'page_id' => $toucharr ),$fname);
2116         }
2117
2118         function trackbackURL() {
2119                 global $wgTitle, $wgScriptPath, $wgServer;
2120
2121                 return "$wgServer$wgScriptPath/trackback.php?article="
2122                         . htmlspecialchars(urlencode($wgTitle->getPrefixedDBkey()));
2123         }
2124
2125         function trackbackRDF() {
2126                 $url = htmlspecialchars($this->getFullURL());
2127                 $title = htmlspecialchars($this->getText());
2128                 $tburl = $this->trackbackURL();
2129
2130                 return "
2131 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
2132          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
2133          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
2134 <rdf:Description
2135    rdf:about=\"$url\"
2136    dc:identifier=\"$url\"
2137    dc:title=\"$title\"
2138    trackback:ping=\"$tburl\" />
2139 </rdf:RDF>";
2140         }
2141 }
2142 ?>