includes/Title.php

   1 <?php
   2 /**
   3  * See title.txt
   4  *
   5  */
   6
   7 /** */
   8 if ( !class_exists( 'UtfNormal' ) ) {
   9         require_once( dirname(__FILE__) . '/normal/UtfNormal.php' );
  10 }
  11
  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 # Constants for pr_cascade bitfield
  22 define( 'CASCADE', 1 );
  23
  24 /**
  25  * Title class
  26  * - Represents a title, which may contain an interwiki designation or namespace
  27  * - Can fetch various kinds of data from the database, albeit inefficiently.
  28  *
  29  */
  30 class Title {
  31         /**
  32          * Static cache variables
  33          */
  34         static private $titleCache=array();
  35         static private $interwikiCache=array();
  36
  37
  38         /**
  39          * All member variables should be considered private
  40          * Please use the accessor functions
  41          */
  42
  43         /**#@+
  44          * @private
  45          */
  46
  47         var $mTextform;                 # Text form (spaces not underscores) of the main part
  48         var $mUrlform;                  # URL-encoded form of the main part
  49         var $mDbkeyform;                # Main part with underscores
  50         var $mUserCaseDBKey;        # DB key with the initial letter in the case specified by the user
  51         var $mNamespace;                # Namespace index, i.e. one of the NS_xxxx constants
  52         var $mInterwiki;                # Interwiki prefix (or null string)
  53         var $mFragment;                 # Title fragment (i.e. the bit after the #)
  54         var $mArticleID;                # Article ID, fetched from the link cache on demand
  55         var $mLatestID;                 # ID of most recent revision
  56         var $mRestrictions;             # Array of groups allowed to edit this article
  57         var $mCascadeRestriction;       # Cascade restrictions on this page to included templates and images?
  58         var $mRestrictionsExpiry;       # When do the restrictions on this page expire?
  59         var $mHasCascadingRestrictions; # Are cascading restrictions in effect on this page?
  60         var $mCascadeRestrictionSources;# Where are the cascading restrictions coming from on this page?
  61         var $mRestrictionsLoaded;       # Boolean for initialisation on demand
  62         var $mPrefixedText;             # Text form including namespace/interwiki, initialised on demand
  63         var $mDefaultNamespace;         # Namespace index when there is no namespace
  64                                         # Zero except in {{transclusion}} tags
  65         var $mWatched;                  # Is $wgUser watching this page? NULL if unfilled, accessed through userIsWatching()
  66         /**#@-*/
  67
  68
  69         /**
  70          * Constructor
  71          * @private
  72          */
  73         /* private */ function __construct() {
  74                 $this->mInterwiki = $this->mUrlform =
  75                 $this->mTextform = $this->mDbkeyform = '';
  76                 $this->mArticleID = -1;
  77                 $this->mNamespace = NS_MAIN;
  78                 $this->mRestrictionsLoaded = false;
  79                 $this->mRestrictions = array();
  80                 # Dont change the following, NS_MAIN is hardcoded in several place
  81                 # See bug #696
  82                 $this->mDefaultNamespace = NS_MAIN;
  83                 $this->mWatched = NULL;
  84                 $this->mLatestID = false;
  85                 $this->mOldRestrictions = false;
  86         }
  87
  88         /**
  89          * Create a new Title from a prefixed DB key
  90          * @param string $key The database key, which has underscores
  91          *      instead of spaces, possibly including namespace and
  92          *      interwiki prefixes
  93          * @return Title the new object, or NULL on an error
  94          */
  95         public static function newFromDBkey( $key ) {
  96                 $t = new Title();
  97                 $t->mDbkeyform = $key;
  98                 if( $t->secureAndSplit() )
  99                         return $t;
 100                 else
 101                         return NULL;
 102         }
 103
 104         /**
 105          * Create a new Title from text, such as what one would
 106          * find in a link. Decodes any HTML entities in the text.
 107          *
 108          * @param string $text the link text; spaces, prefixes,
 109          *      and an initial ':' indicating the main namespace
 110          *      are accepted
 111          * @param int $defaultNamespace the namespace to use if
 112          *      none is specified by a prefix
 113          * @return Title the new object, or NULL on an error
 114          */
 115         public static function newFromText( $text, $defaultNamespace = NS_MAIN ) {
 116                 if( is_object( $text ) ) {
 117                         throw new MWException( 'Title::newFromText given an object' );
 118                 }
 119
 120                 /**
 121                  * Wiki pages often contain multiple links to the same page.
 122                  * Title normalization and parsing can become expensive on
 123                  * pages with many links, so we can save a little time by
 124                  * caching them.
 125                  *
 126                  * In theory these are value objects and won't get changed...
 127                  */
 128                 if( $defaultNamespace == NS_MAIN && isset( Title::$titleCache[$text] ) ) {
 129                         return Title::$titleCache[$text];
 130                 }
 131
 132                 /**
 133                  * Convert things like &eacute; &#257; or &#x3017; into real text...
 134                  */
 135                 $filteredText = Sanitizer::decodeCharReferences( $text );
 136
 137                 $t = new Title();
 138                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 139                 $t->mDefaultNamespace = $defaultNamespace;
 140
 141                 static $cachedcount = 0 ;
 142                 if( $t->secureAndSplit() ) {
 143                         if( $defaultNamespace == NS_MAIN ) {
 144                                 if( $cachedcount >= MW_TITLECACHE_MAX ) {
 145                                         # Avoid memory leaks on mass operations...
 146                                         Title::$titleCache = array();
 147                                         $cachedcount=0;
 148                                 }
 149                                 $cachedcount++;
 150                                 Title::$titleCache[$text] =& $t;
 151                         }
 152                         return $t;
 153                 } else {
 154                         $ret = NULL;
 155                         return $ret;
 156                 }
 157         }
 158
 159         /**
 160          * Create a new Title from URL-encoded text. Ensures that
 161          * the given title's length does not exceed the maximum.
 162          * @param string $url the title, as might be taken from a URL
 163          * @return Title the new object, or NULL on an error
 164          */
 165         public static function newFromURL( $url ) {
 166                 global $wgLegalTitleChars;
 167                 $t = new Title();
 168
 169                 # For compatibility with old buggy URLs. "+" is usually not valid in titles,
 170                 # but some URLs used it as a space replacement and they still come
 171                 # from some external search tools.
 172                 if ( strpos( $wgLegalTitleChars, '+' ) === false ) {
 173                         $url = str_replace( '+', ' ', $url );
 174                 }
 175
 176                 $t->mDbkeyform = str_replace( ' ', '_', $url );
 177                 if( $t->secureAndSplit() ) {
 178                         return $t;
 179                 } else {
 180                         return NULL;
 181                 }
 182         }
 183
 184         /**
 185          * Create a new Title from an article ID
 186          *
 187          * @todo This is inefficiently implemented, the page row is requested
 188          *       but not used for anything else
 189          *
 190          * @param int $id the page_id corresponding to the Title to create
 191          * @return Title the new object, or NULL on an error
 192          */
 193         public static function newFromID( $id ) {
 194                 $fname = 'Title::newFromID';
 195                 $dbr = wfGetDB( DB_SLAVE );
 196                 $row = $dbr->selectRow( 'page', array( 'page_namespace', 'page_title' ),
 197                         array( 'page_id' => $id ), $fname );
 198                 if ( $row !== false ) {
 199                         $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 200                 } else {
 201                         $title = NULL;
 202                 }
 203                 return $title;
 204         }
 205
 206         /**
 207          * Make an array of titles from an array of IDs
 208          */
 209         public static function newFromIDs( $ids ) {
 210                 $dbr = wfGetDB( DB_SLAVE );
 211                 $res = $dbr->select( 'page', array( 'page_namespace', 'page_title' ),
 212                         'page_id IN (' . $dbr->makeList( $ids ) . ')', __METHOD__ );
 213
 214                 $titles = array();
 215                 while ( $row = $dbr->fetchObject( $res ) ) {
 216                         $titles[] = Title::makeTitle( $row->page_namespace, $row->page_title );
 217                 }
 218                 return $titles;
 219         }
 220
 221         /**
 222          * Create a new Title from a namespace index and a DB key.
 223          * It's assumed that $ns and $title are *valid*, for instance when
 224          * they came directly from the database or a special page name.
 225          * For convenience, spaces are converted to underscores so that
 226          * eg user_text fields can be used directly.
 227          *
 228          * @param int $ns the namespace of the article
 229          * @param string $title the unprefixed database key form
 230          * @return Title the new object
 231          */
 232         public static function &makeTitle( $ns, $title ) {
 233                 $t = new Title();
 234                 $t->mInterwiki = '';
 235                 $t->mFragment = '';
 236                 $t->mNamespace = $ns = intval( $ns );
 237                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 238                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 239                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 240                 $t->mTextform = str_replace( '_', ' ', $title );
 241                 return $t;
 242         }
 243
 244         /**
 245          * Create a new Title from a namespace index and a DB key.
 246          * The parameters will be checked for validity, which is a bit slower
 247          * than makeTitle() but safer for user-provided data.
 248          *
 249          * @param int $ns the namespace of the article
 250          * @param string $title the database key form
 251          * @return Title the new object, or NULL on an error
 252          */
 253         public static function makeTitleSafe( $ns, $title ) {
 254                 $t = new Title();
 255                 $t->mDbkeyform = Title::makeName( $ns, $title );
 256                 if( $t->secureAndSplit() ) {
 257                         return $t;
 258                 } else {
 259                         return NULL;
 260                 }
 261         }
 262
 263         /**
 264          * Create a new Title for the Main Page
 265          * @return Title the new object
 266          */
 267         public static function newMainPage() {
 268                 return Title::newFromText( wfMsgForContent( 'mainpage' ) );
 269         }
 270
 271         /**
 272          * Extract a redirect destination from a string and return the
 273          * Title, or null if the text doesn't contain a valid redirect
 274          *
 275          * @param string $text Text with possible redirect
 276          * @return Title
 277          */
 278         public static function newFromRedirect( $text ) {
 279                 $redir = MagicWord::get( 'redirect' );
 280                 if( $redir->matchStart( $text ) ) {
 281                         // Extract the first link and see if it's usable
 282                         if( preg_match( '!\[{2}(.*?)(?:\||\]{2})!', $text, $m ) ) {
 283                                 // Strip preceding colon used to "escape" categories, etc.
 284                                 // and URL-decode links
 285                                 $m[1] = urldecode( ltrim( $m[1], ':' ) );
 286                                 $title = Title::newFromText( $m[1] );
 287                                 // Redirects to Special:Userlogout are not permitted
 288                                 if( $title instanceof Title && !$title->isSpecial( 'Userlogout' ) )
 289                                         return $title;
 290                         }
 291                 }
 292                 return null;
 293         }
 294
 295 #----------------------------------------------------------------------------
 296 #       Static functions
 297 #----------------------------------------------------------------------------
 298
 299         /**
 300          * Get the prefixed DB key associated with an ID
 301          * @param int $id the page_id of the article
 302          * @return Title an object representing the article, or NULL
 303          *      if no such article was found
 304          * @static
 305          * @access public
 306          */
 307         function nameOf( $id ) {
 308                 $fname = 'Title::nameOf';
 309                 $dbr = wfGetDB( DB_SLAVE );
 310
 311                 $s = $dbr->selectRow( 'page', array( 'page_namespace','page_title' ),  array( 'page_id' => $id ), $fname );
 312                 if ( $s === false ) { return NULL; }
 313
 314                 $n = Title::makeName( $s->page_namespace, $s->page_title );
 315                 return $n;
 316         }
 317
 318         /**
 319          * Get a regex character class describing the legal characters in a link
 320          * @return string the list of characters, not delimited
 321          */
 322         public static function legalChars() {
 323                 global $wgLegalTitleChars;
 324                 return $wgLegalTitleChars;
 325         }
 326
 327         /**
 328          * Get a string representation of a title suitable for
 329          * including in a search index
 330          *
 331          * @param int $ns a namespace index
 332          * @param string $title text-form main part
 333          * @return string a stripped-down title string ready for the
 334          *      search index
 335          */
 336         public static function indexTitle( $ns, $title ) {
 337                 global $wgContLang;
 338
 339                 $lc = SearchEngine::legalSearchChars() . '&#;';
 340                 $t = $wgContLang->stripForSearch( $title );
 341                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 342                 $t = $wgContLang->lc( $t );
 343
 344                 # Handle 's, s'
 345                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 346                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 347
 348                 $t = preg_replace( "/\\s+/", ' ', $t );
 349
 350                 if ( $ns == NS_IMAGE ) {
 351                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 352                 }
 353                 return trim( $t );
 354         }
 355
 356         /*
 357          * Make a prefixed DB key from a DB key and a namespace index
 358          * @param int $ns numerical representation of the namespace
 359          * @param string $title the DB key form the title
 360          * @return string the prefixed form of the title
 361          */
 362         public static function makeName( $ns, $title ) {
 363                 global $wgContLang;
 364
 365                 $n = $wgContLang->getNsText( $ns );
 366                 return $n == '' ? $title : "$n:$title";
 367         }
 368
 369         /**
 370          * Returns the URL associated with an interwiki prefix
 371          * @param string $key the interwiki prefix (e.g. "MeatBall")
 372          * @return the associated URL, containing "$1", which should be
 373          *      replaced by an article title
 374          * @static (arguably)
 375          */
 376         public function getInterwikiLink( $key )  {
 377                 global $wgMemc, $wgInterwikiExpiry;
 378                 global $wgInterwikiCache, $wgContLang;
 379                 $fname = 'Title::getInterwikiLink';
 380
 381                 $key = $wgContLang->lc( $key );
 382
 383                 $k = wfMemcKey( 'interwiki', $key );
 384                 if( array_key_exists( $k, Title::$interwikiCache ) ) {
 385                         return Title::$interwikiCache[$k]->iw_url;
 386                 }
 387
 388                 if ($wgInterwikiCache) {
 389                         return Title::getInterwikiCached( $key );
 390                 }
 391
 392                 $s = $wgMemc->get( $k );
 393                 # Ignore old keys with no iw_local
 394                 if( $s && isset( $s->iw_local ) && isset($s->iw_trans)) {
 395                         Title::$interwikiCache[$k] = $s;
 396                         return $s->iw_url;
 397                 }
 398
 399                 $dbr = wfGetDB( DB_SLAVE );
 400                 $res = $dbr->select( 'interwiki',
 401                         array( 'iw_url', 'iw_local', 'iw_trans' ),
 402                         array( 'iw_prefix' => $key ), $fname );
 403                 if( !$res ) {
 404                         return '';
 405                 }
 406
 407                 $s = $dbr->fetchObject( $res );
 408                 if( !$s ) {
 409                         # Cache non-existence: create a blank object and save it to memcached
 410                         $s = (object)false;
 411                         $s->iw_url = '';
 412                         $s->iw_local = 0;
 413                         $s->iw_trans = 0;
 414                 }
 415                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 416                 Title::$interwikiCache[$k] = $s;
 417
 418                 return $s->iw_url;
 419         }
 420
 421         /**
 422          * Fetch interwiki prefix data from local cache in constant database
 423          *
 424          * More logic is explained in DefaultSettings
 425          *
 426          * @return string URL of interwiki site
 427          */
 428         public static function getInterwikiCached( $key ) {
 429                 global $wgInterwikiCache, $wgInterwikiScopes, $wgInterwikiFallbackSite;
 430                 static $db, $site;
 431
 432                 if (!$db)
 433                         $db=dba_open($wgInterwikiCache,'r','cdb');
 434                 /* Resolve site name */
 435                 if ($wgInterwikiScopes>=3 and !$site) {
 436                         $site = dba_fetch('__sites:' . wfWikiID(), $db);
 437                         if ($site=="")
 438                                 $site = $wgInterwikiFallbackSite;
 439                 }
 440                 $value = dba_fetch( wfMemcKey( $key ), $db);
 441                 if ($value=='' and $wgInterwikiScopes>=3) {
 442                         /* try site-level */
 443                         $value = dba_fetch("_{$site}:{$key}", $db);
 444                 }
 445                 if ($value=='' and $wgInterwikiScopes>=2) {
 446                         /* try globals */
 447                         $value = dba_fetch("__global:{$key}", $db);
 448                 }
 449                 if ($value=='undef')
 450                         $value='';
 451                 $s = (object)false;
 452                 $s->iw_url = '';
 453                 $s->iw_local = 0;
 454                 $s->iw_trans = 0;
 455                 if ($value!='') {
 456                         list($local,$url)=explode(' ',$value,2);
 457                         $s->iw_url=$url;
 458                         $s->iw_local=(int)$local;
 459                 }
 460                 Title::$interwikiCache[wfMemcKey( 'interwiki', $key )] = $s;
 461                 return $s->iw_url;
 462         }
 463         /**
 464          * Determine whether the object refers to a page within
 465          * this project.
 466          *
 467          * @return bool TRUE if this is an in-project interwiki link
 468          *      or a wikilink, FALSE otherwise
 469          */
 470         public function isLocal() {
 471                 if ( $this->mInterwiki != '' ) {
 472                         # Make sure key is loaded into cache
 473                         $this->getInterwikiLink( $this->mInterwiki );
 474                         $k = wfMemcKey( 'interwiki', $this->mInterwiki );
 475                         return (bool)(Title::$interwikiCache[$k]->iw_local);
 476                 } else {
 477                         return true;
 478                 }
 479         }
 480
 481         /**
 482          * Determine whether the object refers to a page within
 483          * this project and is transcludable.
 484          *
 485          * @return bool TRUE if this is transcludable
 486          */
 487         public function isTrans() {
 488                 if ($this->mInterwiki == '')
 489                         return false;
 490                 # Make sure key is loaded into cache
 491                 $this->getInterwikiLink( $this->mInterwiki );
 492                 $k = wfMemcKey( 'interwiki', $this->mInterwiki );
 493                 return (bool)(Title::$interwikiCache[$k]->iw_trans);
 494         }
 495
 496         /**
 497          * Escape a text fragment, say from a link, for a URL
 498          */
 499         static function escapeFragmentForURL( $fragment ) {
 500                 $fragment = str_replace( ' ', '_', $fragment );
 501                 $fragment = urlencode( Sanitizer::decodeCharReferences( $fragment ) );
 502                 $replaceArray = array(
 503                         '%3A' => ':',
 504                         '%' => '.'
 505                 );
 506                 return strtr( $fragment, $replaceArray );
 507         }
 508
 509 #----------------------------------------------------------------------------
 510 #       Other stuff
 511 #----------------------------------------------------------------------------
 512
 513         /** Simple accessors */
 514         /**
 515          * Get the text form (spaces not underscores) of the main part
 516          * @return string
 517          */
 518         public function getText() { return $this->mTextform; }
 519         /**
 520          * Get the URL-encoded form of the main part
 521          * @return string
 522          */
 523         public function getPartialURL() { return $this->mUrlform; }
 524         /**
 525          * Get the main part with underscores
 526          * @return string
 527          */
 528         public function getDBkey() { return $this->mDbkeyform; }
 529         /**
 530          * Get the namespace index, i.e. one of the NS_xxxx constants
 531          * @return int
 532          */
 533         public function getNamespace() { return $this->mNamespace; }
 534         /**
 535          * Get the namespace text
 536          * @return string
 537          */
 538         public function getNsText() {
 539                 global $wgContLang, $wgCanonicalNamespaceNames;
 540
 541                 if ( '' != $this->mInterwiki ) {
 542                         // This probably shouldn't even happen. ohh man, oh yuck.
 543                         // But for interwiki transclusion it sometimes does.
 544                         // Shit. Shit shit shit.
 545                         //
 546                         // Use the canonical namespaces if possible to try to
 547                         // resolve a foreign namespace.
 548                         if( isset( $wgCanonicalNamespaceNames[$this->mNamespace] ) ) {
 549                                 return $wgCanonicalNamespaceNames[$this->mNamespace];
 550                         }
 551                 }
 552                 return $wgContLang->getNsText( $this->mNamespace );
 553         }
 554         /**
 555          * Get the DB key with the initial letter case as specified by the user
 556          */
 557         function getUserCaseDBKey() {
 558                 return $this->mUserCaseDBKey;
 559         }
 560         /**
 561          * Get the namespace text of the subject (rather than talk) page
 562          * @return string
 563          */
 564         public function getSubjectNsText() {
 565                 global $wgContLang;
 566                 return $wgContLang->getNsText( Namespace::getSubject( $this->mNamespace ) );
 567         }
 568
 569         /**
 570          * Get the namespace text of the talk page
 571          * @return string
 572          */
 573         public function getTalkNsText() {
 574                 global $wgContLang;
 575                 return( $wgContLang->getNsText( Namespace::getTalk( $this->mNamespace ) ) );
 576         }
 577
 578         /**
 579          * Could this title have a corresponding talk page?
 580          * @return bool
 581          */
 582         public function canTalk() {
 583                 return( Namespace::canTalk( $this->mNamespace ) );
 584         }
 585
 586         /**
 587          * Get the interwiki prefix (or null string)
 588          * @return string
 589          */
 590         public function getInterwiki() { return $this->mInterwiki; }
 591         /**
 592          * Get the Title fragment (i.e. the bit after the #) in text form
 593          * @return string
 594          */
 595         public function getFragment() { return $this->mFragment; }
 596         /**
 597          * Get the fragment in URL form, including the "#" character if there is one
 598          * @return string
 599          */
 600         public function getFragmentForURL() {
 601                 if ( $this->mFragment == '' ) {
 602                         return '';
 603                 } else {
 604                         return '#' . Title::escapeFragmentForURL( $this->mFragment );
 605                 }
 606         }
 607         /**
 608          * Get the default namespace index, for when there is no namespace
 609          * @return int
 610          */
 611         public function getDefaultNamespace() { return $this->mDefaultNamespace; }
 612
 613         /**
 614          * Get title for search index
 615          * @return string a stripped-down title string ready for the
 616          *      search index
 617          */
 618         public function getIndexTitle() {
 619                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 620         }
 621
 622         /**
 623          * Get the prefixed database key form
 624          * @return string the prefixed title, with underscores and
 625          *      any interwiki and namespace prefixes
 626          */
 627         public function getPrefixedDBkey() {
 628                 $s = $this->prefix( $this->mDbkeyform );
 629                 $s = str_replace( ' ', '_', $s );
 630                 return $s;
 631         }
 632
 633         /**
 634          * Get the prefixed title with spaces.
 635          * This is the form usually used for display
 636          * @return string the prefixed title, with spaces
 637          */
 638         public function getPrefixedText() {
 639                 if ( empty( $this->mPrefixedText ) ) { // FIXME: bad usage of empty() ?
 640                         $s = $this->prefix( $this->mTextform );
 641                         $s = str_replace( '_', ' ', $s );
 642                         $this->mPrefixedText = $s;
 643                 }
 644                 return $this->mPrefixedText;
 645         }
 646
 647         /**
 648          * Get the prefixed title with spaces, plus any fragment
 649          * (part beginning with '#')
 650          * @return string the prefixed title, with spaces and
 651          *      the fragment, including '#'
 652          */
 653         public function getFullText() {
 654                 $text = $this->getPrefixedText();
 655                 if( '' != $this->mFragment ) {
 656                         $text .= '#' . $this->mFragment;
 657                 }
 658                 return $text;
 659         }
 660
 661         /**
 662          * Get the base name, i.e. the leftmost parts before the /
 663          * @return string Base name
 664          */
 665         public function getBaseText() {
 666                 global $wgNamespacesWithSubpages;
 667                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) && $wgNamespacesWithSubpages[ $this->mNamespace ] ) {
 668                         $parts = explode( '/', $this->getText() );
 669                         # Don't discard the real title if there's no subpage involved
 670                         if( count( $parts ) > 1 )
 671                                 unset( $parts[ count( $parts ) - 1 ] );
 672                         return implode( '/', $parts );
 673                 } else {
 674                         return $this->getText();
 675                 }
 676         }
 677
 678         /**
 679          * Get the lowest-level subpage name, i.e. the rightmost part after /
 680          * @return string Subpage name
 681          */
 682         public function getSubpageText() {
 683                 global $wgNamespacesWithSubpages;
 684                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) && $wgNamespacesWithSubpages[ $this->mNamespace ] ) {
 685                         $parts = explode( '/', $this->mTextform );
 686                         return( $parts[ count( $parts ) - 1 ] );
 687                 } else {
 688                         return( $this->mTextform );
 689                 }
 690         }
 691
 692         /**
 693          * Get a URL-encoded form of the subpage text
 694          * @return string URL-encoded subpage name
 695          */
 696         public function getSubpageUrlForm() {
 697                 $text = $this->getSubpageText();
 698                 $text = wfUrlencode( str_replace( ' ', '_', $text ) );
 699                 $text = str_replace( '%28', '(', str_replace( '%29', ')', $text ) ); # Clean up the URL; per below, this might not be safe
 700                 return( $text );
 701         }
 702
 703         /**
 704          * Get a URL-encoded title (not an actual URL) including interwiki
 705          * @return string the URL-encoded form
 706          */
 707         public function getPrefixedURL() {
 708                 $s = $this->prefix( $this->mDbkeyform );
 709                 $s = str_replace( ' ', '_', $s );
 710
 711                 $s = wfUrlencode ( $s ) ;
 712
 713                 # Cleaning up URL to make it look nice -- is this safe?
 714                 $s = str_replace( '%28', '(', $s );
 715                 $s = str_replace( '%29', ')', $s );
 716
 717                 return $s;
 718         }
 719
 720         /**
 721          * Get a real URL referring to this title, with interwiki link and
 722          * fragment
 723          *
 724          * @param string $query an optional query string, not used
 725          *      for interwiki links
 726          * @param string $variant language variant of url (for sr, zh..)
 727          * @return string the URL
 728          */
 729         public function getFullURL( $query = '', $variant = false ) {
 730                 global $wgContLang, $wgServer, $wgRequest;
 731
 732                 if ( '' == $this->mInterwiki ) {
 733                         $url = $this->getLocalUrl( $query, $variant );
 734
 735                         // Ugly quick hack to avoid duplicate prefixes (bug 4571 etc)
 736                         // Correct fix would be to move the prepending elsewhere.
 737                         if ($wgRequest->getVal('action') != 'render') {
 738                                 $url = $wgServer . $url;
 739                         }
 740                 } else {
 741                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 742
 743                         $namespace = wfUrlencode( $this->getNsText() );
 744                         if ( '' != $namespace ) {
 745                                 # Can this actually happen? Interwikis shouldn't be parsed.
 746                                 # Yes! It can in interwiki transclusion. But... it probably shouldn't.
 747                                 $namespace .= ':';
 748                         }
 749                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 750                         $url = wfAppendQuery( $url, $query );
 751                 }
 752
 753                 # Finally, add the fragment.
 754                 $url .= $this->getFragmentForURL();
 755
 756                 wfRunHooks( 'GetFullURL', array( &$this, &$url, $query ) );
 757                 return $url;
 758         }
 759
 760         /**
 761          * Get a URL with no fragment or server name.  If this page is generated
 762          * with action=render, $wgServer is prepended.
 763          * @param string $query an optional query string; if not specified,
 764          *      $wgArticlePath will be used.
 765          * @param string $variant language variant of url (for sr, zh..)
 766          * @return string the URL
 767          */
 768         public function getLocalURL( $query = '', $variant = false ) {
 769                 global $wgArticlePath, $wgScript, $wgServer, $wgRequest;
 770                 global $wgVariantArticlePath, $wgContLang, $wgUser;
 771
 772                 // internal links should point to same variant as current page (only anonymous users)
 773                 if($variant == false && $wgContLang->hasVariants() && !$wgUser->isLoggedIn()){
 774                         $pref = $wgContLang->getPreferredVariant(false);
 775                         if($pref != $wgContLang->getCode())
 776                                 $variant = $pref;
 777                 }
 778
 779                 if ( $this->isExternal() ) {
 780                         $url = $this->getFullURL();
 781                         if ( $query ) {
 782                                 // This is currently only used for edit section links in the
 783                                 // context of interwiki transclusion. In theory we should
 784                                 // append the query to the end of any existing query string,
 785                                 // but interwiki transclusion is already broken in that case.
 786                                 $url .= "?$query";
 787                         }
 788                 } else {
 789                         $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 790                         if ( $query == '' ) {
 791                                 if($variant!=false && $wgContLang->hasVariants()){
 792                                         if($wgVariantArticlePath==false) {
 793                                                 $variantArticlePath =  "$wgScript?title=$1&variant=$2"; // default
 794                                         } else {
 795                                                 $variantArticlePath = $wgVariantArticlePath;
 796                                         }
 797                                         $url = str_replace( '$2', urlencode( $variant ), $variantArticlePath );
 798                                         $url = str_replace( '$1', $dbkey, $url  );
 799                                 }
 800                                 else {
 801                                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 802                                 }
 803                         } else {
 804                                 global $wgActionPaths;
 805                                 $url = false;
 806                                 $matches = array();
 807                                 if( !empty( $wgActionPaths ) &&
 808                                         preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) )
 809                                 {
 810                                         $action = urldecode( $matches[2] );
 811                                         if( isset( $wgActionPaths[$action] ) ) {
 812                                                 $query = $matches[1];
 813                                                 if( isset( $matches[4] ) ) $query .= $matches[4];
 814                                                 $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 815                                                 if( $query != '' ) $url .= '?' . $query;
 816                                         }
 817                                 }
 818                                 if ( $url === false ) {
 819                                         if ( $query == '-' ) {
 820                                                 $query = '';
 821                                         }
 822                                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 823                                 }
 824                         }
 825
 826                         // FIXME: this causes breakage in various places when we
 827                         // actually expected a local URL and end up with dupe prefixes.
 828                         if ($wgRequest->getVal('action') == 'render') {
 829                                 $url = $wgServer . $url;
 830                         }
 831                 }
 832                 wfRunHooks( 'GetLocalURL', array( &$this, &$url, $query ) );
 833                 return $url;
 834         }
 835
 836         /**
 837          * Get an HTML-escaped version of the URL form, suitable for
 838          * using in a link, without a server name or fragment
 839          * @param string $query an optional query string
 840          * @return string the URL
 841          */
 842         public function escapeLocalURL( $query = '' ) {
 843                 return htmlspecialchars( $this->getLocalURL( $query ) );
 844         }
 845
 846         /**
 847          * Get an HTML-escaped version of the URL form, suitable for
 848          * using in a link, including the server name and fragment
 849          *
 850          * @return string the URL
 851          * @param string $query an optional query string
 852          */
 853         public function escapeFullURL( $query = '' ) {
 854                 return htmlspecialchars( $this->getFullURL( $query ) );
 855         }
 856
 857         /**
 858          * Get the URL form for an internal link.
 859          * - Used in various Squid-related code, in case we have a different
 860          * internal hostname for the server from the exposed one.
 861          *
 862          * @param string $query an optional query string
 863          * @param string $variant language variant of url (for sr, zh..)
 864          * @return string the URL
 865          */
 866         public function getInternalURL( $query = '', $variant = false ) {
 867                 global $wgInternalServer;
 868                 $url = $wgInternalServer . $this->getLocalURL( $query, $variant );
 869                 wfRunHooks( 'GetInternalURL', array( &$this, &$url, $query ) );
 870                 return $url;
 871         }
 872
 873         /**
 874          * Get the edit URL for this Title
 875          * @return string the URL, or a null string if this is an
 876          *      interwiki link
 877          */
 878         public function getEditURL() {
 879                 if ( '' != $this->mInterwiki ) { return ''; }
 880                 $s = $this->getLocalURL( 'action=edit' );
 881
 882                 return $s;
 883         }
 884
 885         /**
 886          * Get the HTML-escaped displayable text form.
 887          * Used for the title field in <a> tags.
 888          * @return string the text, including any prefixes
 889          */
 890         public function getEscapedText() {
 891                 return htmlspecialchars( $this->getPrefixedText() );
 892         }
 893
 894         /**
 895          * Is this Title interwiki?
 896          * @return boolean
 897          */
 898         public function isExternal() { return ( '' != $this->mInterwiki ); }
 899
 900         /**
 901          * Is this page "semi-protected" - the *only* protection is autoconfirm?
 902          *
 903          * @param string Action to check (default: edit)
 904          * @return bool
 905          */
 906         public function isSemiProtected( $action = 'edit' ) {
 907                 if( $this->exists() ) {
 908                         $restrictions = $this->getRestrictions( $action );
 909                         if( count( $restrictions ) > 0 ) {
 910                                 foreach( $restrictions as $restriction ) {
 911                                         if( strtolower( $restriction ) != 'autoconfirmed' )
 912                                                 return false;
 913                                 }
 914                         } else {
 915                                 # Not protected
 916                                 return false;
 917                         }
 918                         return true;
 919                 } else {
 920                         # If it doesn't exist, it can't be protected
 921                         return false;
 922                 }
 923         }
 924
 925         /**
 926          * Does the title correspond to a protected article?
 927          * @param string $what the action the page is protected from,
 928          *      by default checks move and edit
 929          * @return boolean
 930          */
 931         public function isProtected( $action = '' ) {
 932                 global $wgRestrictionLevels;
 933
 934                 # Special pages have inherent protection
 935                 if( $this->getNamespace() == NS_SPECIAL )
 936                         return true;
 937
 938                 # Check regular protection levels
 939                 if( $action == 'edit' || $action == '' ) {
 940                         $r = $this->getRestrictions( 'edit' );
 941                         foreach( $wgRestrictionLevels as $level ) {
 942                                 if( in_array( $level, $r ) && $level != '' ) {
 943                                         return( true );
 944                                 }
 945                         }
 946                 }
 947
 948                 if( $action == 'move' || $action == '' ) {
 949                         $r = $this->getRestrictions( 'move' );
 950                         foreach( $wgRestrictionLevels as $level ) {
 951                                 if( in_array( $level, $r ) && $level != '' ) {
 952                                         return( true );
 953                                 }
 954                         }
 955                 }
 956
 957                 return false;
 958         }
 959
 960         /**
 961          * Is $wgUser is watching this page?
 962          * @return boolean
 963          */
 964         public function userIsWatching() {
 965                 global $wgUser;
 966
 967                 if ( is_null( $this->mWatched ) ) {
 968                         if ( NS_SPECIAL == $this->mNamespace || !$wgUser->isLoggedIn()) {
 969                                 $this->mWatched = false;
 970                         } else {
 971                                 $this->mWatched = $wgUser->isWatched( $this );
 972                         }
 973                 }
 974                 return $this->mWatched;
 975         }
 976
 977         /**
 978          * Can $wgUser perform $action on this page?
 979          * This skips potentially expensive cascading permission checks.
 980          *
 981          * Suitable for use for nonessential UI controls in common cases, but
 982          * _not_ for functional access control.
 983          *
 984          * May provide false positives, but should never provide a false negative.
 985          *
 986          * @param string $action action that permission needs to be checked for
 987          * @return boolean
 988          */
 989         public function quickUserCan( $action ) {
 990                 return $this->userCan( $action, false );
 991         }
 992
 993         /**
 994          * Determines if $wgUser is unable to edit this page because it has been protected
 995          * by $wgNamespaceProtection.
 996          *
 997          * @return boolean
 998          */
 999         public function isNamespaceProtected() {
1000                 global $wgNamespaceProtection, $wgUser;
1001                 if( isset( $wgNamespaceProtection[ $this->mNamespace ] ) ) {
1002                         foreach( (array)$wgNamespaceProtection[ $this->mNamespace ] as $right ) {
1003                                 if( $right != '' && !$wgUser->isAllowed( $right ) )
1004                                         return true;
1005                         }
1006                 }
1007                 return false;
1008         }
1009
1010         /**
1011          * Can $wgUser perform $action on this page?
1012          * @param string $action action that permission needs to be checked for
1013          * @param bool $doExpensiveQueries Set this to false to avoid doing unnecessary queries.
1014          * @return boolean
1015          */
1016         public function userCan( $action, $doExpensiveQueries = true ) {
1017                 global $wgUser;
1018                 return ( $this->getUserPermissionsErrorsInternal( $action, $wgUser, $doExpensiveQueries ) === array());
1019         }
1020
1021         /**
1022          * Can $user perform $action on this page?
1023          * @param string $action action that permission needs to be checked for
1024          * @param bool $doExpensiveQueries Set this to false to avoid doing unnecessary queries.
1025          * @return array Array of arrays of the arguments to wfMsg to explain permissions problems.
1026         */
1027         public function getUserPermissionsErrors( $action, $user, $doExpensiveQueries = true ) {
1028                 $errors = $this->getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries );
1029
1030                 global $wgContLang;
1031                 global $wgLang;
1032
1033                 if ( wfReadOnly() && $action != 'read' ) {
1034                         $errors[] = array( 'readonlytext' );
1035                 }
1036
1037                 global $wgEmailConfirmToEdit;
1038
1039                 if ( $wgEmailConfirmToEdit && !$wgUser->isEmailConfirmed() )
1040                 {
1041                         $errors[] = array( 'confirmedittext' );
1042                 }
1043
1044                 if ( $user->isBlockedFrom( $this ) ) {
1045                         $block = $user->mBlock;
1046
1047                         // This is from OutputPage::blockedPage
1048                         // Copied at r23888 by werdna
1049
1050                         $id = $user->blockedBy();
1051                         $reason = $user->blockedFor();
1052                         $ip = wfGetIP();
1053
1054                         if ( is_numeric( $id ) ) {
1055                                 $name = User::whoIs( $id );
1056                         } else {
1057                                 $name = $id;
1058                         }
1059
1060                         $link = '[[' . $wgContLang->getNsText( NS_USER ) . ":{$name}|{$name}]]";
1061                         $blockid = $block->mId;
1062                         $blockExpiry = $user->mBlock->mExpiry;
1063
1064                         if ( $blockExpiry == 'infinity' ) {
1065                                 // Entry in database (table ipblocks) is 'infinity' but 'ipboptions' uses 'infinite' or 'indefinite'
1066                                 $scBlockExpiryOptions = wfMsg( 'ipboptions' );
1067
1068                                 foreach ( explode( ',', $scBlockExpiryOptions ) as $option ) {
1069                                         if ( strpos( $option, ':' ) == false )
1070                                                 continue;
1071
1072                                         list ($show, $value) = explode( ":", $option );
1073
1074                                         if ( $value == 'infinite' || $value == 'indefinite' ) {
1075                                                 $blockExpiry = $show;
1076                                                 break;
1077                                         }
1078                                 }
1079                         } else {
1080                                 $blockExpiry = $wgLang->timeanddate( wfTimestamp( TS_MW, $blockExpiry ), true );
1081                         }
1082
1083                         $intended = $user->mBlock->mAddress;
1084
1085                         $errors[] = array ( ($block->mAuto ? 'autoblockedtext-concise' : 'blockedtext-concise'), $link, $reason, $ip, $name, $blockid, $blockExpiry, $intended );
1086                 }
1087
1088                 return $errors;
1089         }
1090
1091         /**
1092          * Can $user perform $action on this page?
1093          * This is an internal function, which checks ONLY that previously checked by userCan (i.e. it leaves out checks on wfReadOnly() and blocks)
1094          * @param string $action action that permission needs to be checked for
1095          * @param bool $doExpensiveQueries Set this to false to avoid doing unnecessary queries.
1096          * @return array Array of arrays of the arguments to wfMsg to explain permissions problems.
1097          */
1098         private function getUserPermissionsErrorsInternal( $action, $user, $doExpensiveQueries = true ) {
1099                 $fname = 'Title::userCan';
1100                 wfProfileIn( $fname );
1101
1102                 $errors = array();
1103
1104                 if ( !wfRunHooks( 'userCan', array( &$this, &$user, $action, &$result ) ) ) {
1105                         return $result ? array() : array( array( 'badaccess-group0' ) );
1106                 }
1107
1108                 if( NS_SPECIAL == $this->mNamespace ) {
1109                         $errors[] = array('ns-specialprotected');
1110                 }
1111
1112                 if ( $this->isNamespaceProtected() ) {
1113                         $ns = $this->getNamespace() == NS_MAIN
1114                                 ? wfMsg( 'nstab-main' )
1115                                 : $this->getNsText();
1116                         $errors[] = (NS_MEDIAWIKI == $this->mNamespace
1117                                 ? array('protectedinterface')
1118                                 : array( 'namespaceprotected',  $ns ) );
1119                 }
1120
1121                 if( $this->mDbkeyform == '_' ) {
1122                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
1123                         $errors[] = array('badaccess-group0');
1124                 }
1125
1126                 # protect css/js subpages of user pages
1127                 # XXX: this might be better using restrictions
1128                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
1129                 if( $this->isCssJsSubpage()
1130                         && !$user->isAllowed('editinterface')
1131                         && !preg_match('/^'.preg_quote($user->getName(), '/').'\//', $this->mTextform) ) {
1132                         $errors[] = array('customcssjsprotected');
1133                 }
1134
1135                 if ( $doExpensiveQueries && !$this->isCssJsSubpage() ) {
1136                         # We /could/ use the protection level on the source page, but it's fairly ugly
1137                         #  as we have to establish a precedence hierarchy for pages included by multiple
1138                         #  cascade-protected pages. So just restrict it to people with 'protect' permission,
1139                         #  as they could remove the protection anyway.
1140                         list( $cascadingSources, $restrictions ) = $this->getCascadeProtectionSources();
1141                         # Cascading protection depends on more than this page...
1142                         # Several cascading protected pages may include this page...
1143                         # Check each cascading level
1144                         # This is only for protection restrictions, not for all actions
1145                         if( $cascadingSources > 0 && isset($restrictions[$action]) ) {
1146                                 foreach( $restrictions[$action] as $right ) {
1147                                         $right = ( $right == 'sysop' ) ? 'protect' : $right;
1148                                         if( '' != $right && !$user->isAllowed( $right ) ) {
1149                                                 $pages = '';
1150                                                 foreach( $cascadingSources as $id => $page )
1151                                                         $pages .= '* [[:' . $page->getPrefixedText() . "]]\n";
1152                                                 $errors[] = array( 'cascadeprotected', count( $cascadingSources ), $pages );
1153                                         }
1154                                 }
1155                         }
1156                 }
1157
1158                 foreach( $this->getRestrictions($action) as $right ) {
1159                         // Backwards compatibility, rewrite sysop -> protect
1160                         if ( $right == 'sysop' ) {
1161                                 $right = 'protect';
1162                         }
1163                         if( '' != $right && !$user->isAllowed( $right ) ) {
1164                                 $errors[] = array( 'protectedpagetext' );
1165                         }
1166                 }
1167
1168                 if( $action == 'create' ) {
1169                         if( (  $this->isTalkPage() && !$user->isAllowed( 'createtalk' ) ) ||
1170                                 ( !$this->isTalkPage() && !$user->isAllowed( 'createpage' ) ) ) {
1171                                 $errors[] = $user->isAnon() ? array ('nocreatetext') : array ('nocreate-loggedin');
1172                         }
1173                 } elseif( $action == 'move' &&
1174                         !( $this->isMovable() && $user->isAllowed( 'move' ) ) ) {
1175                         $errors[] = $user->isAnon() ? array ( 'movenologintext' ) : array ('movenotallowed');
1176                 } else if ( !$user->isAllowed( $action ) ) {
1177                         $return = null;
1178                         $groups = array();
1179                         global $wgGroupPermissions;
1180                         foreach( $wgGroupPermissions as $key => $value ) {
1181                             if( isset( $value[$action] ) && $value[$action] == true ) {
1182                                 $groupName = User::getGroupName( $key );
1183                                 $groupPage = User::getGroupPage( $key );
1184                                 if( $groupPage ) {
1185                                     $skin = $user->getSkin();
1186                                     $groups[] = $skin->makeLinkObj( $groupPage, $groupName );
1187                                 } else {
1188                                     $groups[] = $groupName;
1189                                 }
1190                             }
1191                         }
1192                         $n = count( $groups );
1193                         $groups = implode( ', ', $groups );
1194                         switch( $n ) {
1195                             case 0:
1196                             case 1:
1197                             case 2:
1198                                 $return = array( "badaccess-group$n", $groups );
1199                                 break;
1200                             default:
1201                                 $return = array( 'badaccess-groups', $groups );
1202                         }
1203                         $errors[] = $return;
1204                 }
1205
1206                 wfProfileOut( $fname );
1207                 return $errors;
1208         }
1209
1210         /**
1211          * Can $wgUser edit this page?
1212          * @return boolean
1213          * @deprecated use userCan('edit')
1214          */
1215         public function userCanEdit( $doExpensiveQueries = true ) {
1216                 return $this->userCan( 'edit', $doExpensiveQueries );
1217         }
1218
1219         /**
1220          * Can $wgUser create this page?
1221          * @return boolean
1222          * @deprecated use userCan('create')
1223          */
1224         public function userCanCreate( $doExpensiveQueries = true ) {
1225                 return $this->userCan( 'create', $doExpensiveQueries );
1226         }
1227
1228         /**
1229          * Can $wgUser move this page?
1230          * @return boolean
1231          * @deprecated use userCan('move')
1232          */
1233         public function userCanMove( $doExpensiveQueries = true ) {
1234                 return $this->userCan( 'move', $doExpensiveQueries );
1235         }
1236
1237         /**
1238          * Would anybody with sufficient privileges be able to move this page?
1239          * Some pages just aren't movable.
1240          *
1241          * @return boolean
1242          */
1243         public function isMovable() {
1244                 return Namespace::isMovable( $this->getNamespace() )
1245                         && $this->getInterwiki() == '';
1246         }
1247
1248         /**
1249          * Can $wgUser read this page?
1250          * @return boolean
1251          * @todo fold these checks into userCan()
1252          */
1253         public function userCanRead() {
1254                 global $wgUser;
1255
1256                 $result = null;
1257                 wfRunHooks( 'userCan', array( &$this, &$wgUser, 'read', &$result ) );
1258                 if ( $result !== null ) {
1259                         return $result;
1260                 }
1261
1262                 if( $wgUser->isAllowed( 'read' ) ) {
1263                         return true;
1264                 } else {
1265                         global $wgWhitelistRead;
1266
1267                         /**
1268                          * Always grant access to the login page.
1269                          * Even anons need to be able to log in.
1270                         */
1271                         if( $this->isSpecial( 'Userlogin' ) || $this->isSpecial( 'Resetpass' ) ) {
1272                                 return true;
1273                         }
1274
1275                         /**
1276                          * Check for explicit whitelisting
1277                          */
1278                         $name = $this->getPrefixedText();
1279                         if( $wgWhitelistRead && in_array( $name, $wgWhitelistRead, true ) )
1280                                 return true;
1281
1282                         /**
1283                          * Old settings might have the title prefixed with
1284                          * a colon for main-namespace pages
1285                          */
1286                         if( $wgWhitelistRead && $this->getNamespace() == NS_MAIN ) {
1287                                 if( in_array( ':' . $name, $wgWhitelistRead ) )
1288                                         return true;
1289                         }
1290
1291                         /**
1292                          * If it's a special page, ditch the subpage bit
1293                          * and check again
1294                          */
1295                         if( $this->getNamespace() == NS_SPECIAL ) {
1296                                 $name = $this->getText();
1297                                 list( $name, $subpage ) = SpecialPage::resolveAliasWithSubpage( $name );
1298                                 $pure = SpecialPage::getTitleFor( $name )->getPrefixedText();
1299                                 if( in_array( $pure, $wgWhitelistRead, true ) )
1300                                         return true;
1301                         }
1302
1303                 }
1304                 return false;
1305         }
1306
1307         /**
1308          * Is this a talk page of some sort?
1309          * @return bool
1310          */
1311         public function isTalkPage() {
1312                 return Namespace::isTalk( $this->getNamespace() );
1313         }
1314
1315         /**
1316          * Is this a subpage?
1317          * @return bool
1318          */
1319         public function isSubpage() {
1320                 global $wgNamespacesWithSubpages;
1321
1322                 if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) ) {
1323                         return ( strpos( $this->getText(), '/' ) !== false && $wgNamespacesWithSubpages[ $this->mNamespace ] == true );
1324                 } else {
1325                         return false;
1326                 }
1327         }
1328
1329         /**
1330          * Could this page contain custom CSS or JavaScript, based
1331          * on the title?
1332          *
1333          * @return bool
1334          */
1335         public function isCssOrJsPage() {
1336                 return $this->mNamespace == NS_MEDIAWIKI
1337                         && preg_match( '!\.(?:css|js)$!u', $this->mTextform ) > 0;
1338         }
1339
1340         /**
1341          * Is this a .css or .js subpage of a user page?
1342          * @return bool
1343          */
1344         public function isCssJsSubpage() {
1345                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.(?:css|js)$/", $this->mTextform ) );
1346         }
1347         /**
1348          * Is this a *valid* .css or .js subpage of a user page?
1349          * Check that the corresponding skin exists
1350          */
1351         public function isValidCssJsSubpage() {
1352                 if ( $this->isCssJsSubpage() ) {
1353                         $skinNames = Skin::getSkinNames();
1354                         return array_key_exists( $this->getSkinFromCssJsSubpage(), $skinNames );
1355                 } else {
1356                         return false;
1357                 }
1358         }
1359         /**
1360          * Trim down a .css or .js subpage title to get the corresponding skin name
1361          */
1362         public function getSkinFromCssJsSubpage() {
1363                 $subpage = explode( '/', $this->mTextform );
1364                 $subpage = $subpage[ count( $subpage ) - 1 ];
1365                 return( str_replace( array( '.css', '.js' ), array( '', '' ), $subpage ) );
1366         }
1367         /**
1368          * Is this a .css subpage of a user page?
1369          * @return bool
1370          */
1371         public function isCssSubpage() {
1372                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.css$/", $this->mTextform ) );
1373         }
1374         /**
1375          * Is this a .js subpage of a user page?
1376          * @return bool
1377          */
1378         public function isJsSubpage() {
1379                 return ( NS_USER == $this->mNamespace and preg_match("/\\/.*\\.js$/", $this->mTextform ) );
1380         }
1381         /**
1382          * Protect css/js subpages of user pages: can $wgUser edit
1383          * this page?
1384          *
1385          * @return boolean
1386          * @todo XXX: this might be better using restrictions
1387          */
1388         public function userCanEditCssJsSubpage() {
1389                 global $wgUser;
1390                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1391         }
1392
1393         /**
1394          * Cascading protection: Return true if cascading restrictions apply to this page, false if not.
1395          *
1396          * @return bool If the page is subject to cascading restrictions.
1397          */
1398         public function isCascadeProtected() {
1399                 list( $sources, $restrictions ) = $this->getCascadeProtectionSources( false );
1400                 return ( $sources > 0 );
1401         }
1402
1403         /**
1404          * Cascading protection: Get the source of any cascading restrictions on this page.
1405          *
1406          * @param $get_pages bool Whether or not to retrieve the actual pages that the restrictions have come from.
1407          * @return array( mixed title array, restriction array)
1408          * Array of the Title objects of the pages from which cascading restrictions have come, false for none, or true if such restrictions exist, but $get_pages was not set.
1409          * The restriction array is an array of each type, each of which contains an array of unique groups
1410          */
1411         public function getCascadeProtectionSources( $get_pages = true ) {
1412                 global $wgEnableCascadingProtection, $wgRestrictionTypes;
1413
1414                 # Define our dimension of restrictions types
1415                 $pagerestrictions = array();
1416                 foreach( $wgRestrictionTypes as $action )
1417                         $pagerestrictions[$action] = array();
1418
1419                 if (!$wgEnableCascadingProtection)
1420                         return array( false, $pagerestrictions );
1421
1422                 if ( isset( $this->mCascadeSources ) && $get_pages ) {
1423                         return array( $this->mCascadeSources, $this->mCascadingRestrictions );
1424                 } else if ( isset( $this->mHasCascadingRestrictions ) && !$get_pages ) {
1425                         return array( $this->mHasCascadingRestrictions, $pagerestrictions );
1426                 }
1427
1428                 wfProfileIn( __METHOD__ );
1429
1430                 $dbr = wfGetDb( DB_SLAVE );
1431
1432                 if ( $this->getNamespace() == NS_IMAGE ) {
1433                         $tables = array ('imagelinks', 'page_restrictions');
1434                         $where_clauses = array(
1435                                 'il_to' => $this->getDBkey(),
1436                                 'il_from=pr_page',
1437                                 'pr_cascade' => 1 );
1438                 } else {
1439                         $tables = array ('templatelinks', 'page_restrictions');
1440                         $where_clauses = array(
1441                                 'tl_namespace' => $this->getNamespace(),
1442                                 'tl_title' => $this->getDBkey(),
1443                                 'tl_from=pr_page',
1444                                 'pr_cascade' => 1 );
1445                 }
1446
1447                 if ( $get_pages ) {
1448                         $cols = array('pr_page', 'page_namespace', 'page_title', 'pr_expiry', 'pr_type', 'pr_level' );
1449                         $where_clauses[] = 'page_id=pr_page';
1450                         $tables[] = 'page';
1451                 } else {
1452                         $cols = array( 'pr_expiry' );
1453                 }
1454
1455                 $res = $dbr->select( $tables, $cols, $where_clauses, __METHOD__ );
1456
1457                 $sources = $get_pages ? array() : false;
1458                 $now = wfTimestampNow();
1459                 $purgeExpired = false;
1460
1461                 while( $row = $dbr->fetchObject( $res ) ) {
1462                         $expiry = Block::decodeExpiry( $row->pr_expiry );
1463                         if( $expiry > $now ) {
1464                                 if ($get_pages) {
1465                                         $page_id = $row->pr_page;
1466                                         $page_ns = $row->page_namespace;
1467                                         $page_title = $row->page_title;
1468                                         $sources[$page_id] = Title::makeTitle($page_ns, $page_title);
1469                                         # Add groups needed for each restriction type if its not already there
1470                                         # Make sure this restriction type still exists
1471                                         if ( isset($pagerestrictions[$row->pr_type]) && !in_array($row->pr_level, $pagerestrictions[$row->pr_type]) ) {
1472                                                 $pagerestrictions[$row->pr_type][]=$row->pr_level;
1473                                         }
1474                                 } else {
1475                                         $sources = true;
1476                                 }
1477                         } else {
1478                                 // Trigger lazy purge of expired restrictions from the db
1479                                 $purgeExpired = true;
1480                         }
1481                 }
1482                 if( $purgeExpired ) {
1483                         Title::purgeExpiredRestrictions();
1484                 }
1485
1486                 wfProfileOut( __METHOD__ );
1487
1488                 if ( $get_pages ) {
1489                         $this->mCascadeSources = $sources;
1490                         $this->mCascadingRestrictions = $pagerestrictions;
1491                 } else {
1492                         $this->mHasCascadingRestrictions = $sources;
1493                 }
1494
1495                 return array( $sources, $pagerestrictions );
1496         }
1497
1498         function areRestrictionsCascading() {
1499                 if (!$this->mRestrictionsLoaded) {
1500                         $this->loadRestrictions();
1501                 }
1502
1503                 return $this->mCascadeRestriction;
1504         }
1505
1506         /**
1507          * Loads a string into mRestrictions array
1508          * @param resource $res restrictions as an SQL result.
1509          */
1510         private function loadRestrictionsFromRow( $res, $oldFashionedRestrictions = NULL ) {
1511                 $dbr = wfGetDb( DB_SLAVE );
1512
1513                 $this->mRestrictions['edit'] = array();
1514                 $this->mRestrictions['move'] = array();
1515
1516                 # Backwards-compatibility: also load the restrictions from the page record (old format).
1517
1518                 if ( $oldFashionedRestrictions == NULL ) {
1519                         $oldFashionedRestrictions = $dbr->selectField( 'page', 'page_restrictions', array( 'page_id' => $this->getArticleId() ), __METHOD__ );
1520                 }
1521
1522                 if ($oldFashionedRestrictions != '') {
1523
1524                         foreach( explode( ':', trim( $oldFashionedRestrictions ) ) as $restrict ) {
1525                                 $temp = explode( '=', trim( $restrict ) );
1526                                 if(count($temp) == 1) {
1527                                         // old old format should be treated as edit/move restriction
1528                                         $this->mRestrictions["edit"] = explode( ',', trim( $temp[0] ) );
1529                                         $this->mRestrictions["move"] = explode( ',', trim( $temp[0] ) );
1530                                 } else {
1531                                         $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1532                                 }
1533                         }
1534
1535                         $this->mOldRestrictions = true;
1536                         $this->mCascadeRestriction = false;
1537                         $this->mRestrictionsExpiry = Block::decodeExpiry('');
1538
1539                 }
1540
1541                 if( $dbr->numRows( $res ) ) {
1542                         # Current system - load second to make them override.
1543                         $now = wfTimestampNow();
1544                         $purgeExpired = false;
1545
1546                         while ($row = $dbr->fetchObject( $res ) ) {
1547                                 # Cycle through all the restrictions.
1548
1549                                 // This code should be refactored, now that it's being used more generally,
1550                                 // But I don't really see any harm in leaving it in Block for now -werdna
1551                                 $expiry = Block::decodeExpiry( $row->pr_expiry );
1552
1553                                 // Only apply the restrictions if they haven't expired!
1554                                 if ( !$expiry || $expiry > $now ) {
1555                                         $this->mRestrictionsExpiry = $expiry;
1556                                         $this->mRestrictions[$row->pr_type] = explode( ',', trim( $row->pr_level ) );
1557
1558                                         $this->mCascadeRestriction |= $row->pr_cascade;
1559                                 } else {
1560                                         // Trigger a lazy purge of expired restrictions
1561                                         $purgeExpired = true;
1562                                 }
1563                         }
1564
1565                         if( $purgeExpired ) {
1566                                 Title::purgeExpiredRestrictions();
1567                         }
1568                 }
1569
1570                 $this->mRestrictionsLoaded = true;
1571         }
1572
1573         public function loadRestrictions( $oldFashionedRestrictions = NULL ) {
1574                 if( !$this->mRestrictionsLoaded ) {
1575                         $dbr = wfGetDB( DB_SLAVE );
1576
1577                         $res = $dbr->select( 'page_restrictions', '*',
1578                                 array ( 'pr_page' => $this->getArticleId() ), __METHOD__ );
1579
1580                         $this->loadRestrictionsFromRow( $res, $oldFashionedRestrictions );
1581                 }
1582         }
1583
1584         /**
1585          * Purge expired restrictions from the page_restrictions table
1586          */
1587         static function purgeExpiredRestrictions() {
1588                 $dbw = wfGetDB( DB_MASTER );
1589                 $dbw->delete( 'page_restrictions',
1590                         array( 'pr_expiry < ' . $dbw->addQuotes( $dbw->timestamp() ) ),
1591                         __METHOD__ );
1592         }
1593
1594         /**
1595          * Accessor/initialisation for mRestrictions
1596          *
1597          * @param string $action action that permission needs to be checked for
1598          * @return array the array of groups allowed to edit this article
1599          */
1600         public function getRestrictions( $action ) {
1601                 if( $this->exists() ) {
1602                         if( !$this->mRestrictionsLoaded ) {
1603                                 $this->loadRestrictions();
1604                         }
1605                         return isset( $this->mRestrictions[$action] )
1606                                         ? $this->mRestrictions[$action]
1607                                         : array();
1608                 } else {
1609                         return array();
1610                 }
1611         }
1612
1613         /**
1614          * Is there a version of this page in the deletion archive?
1615          * @return int the number of archived revisions
1616          */
1617         public function isDeleted() {
1618                 $fname = 'Title::isDeleted';
1619                 if ( $this->getNamespace() < 0 ) {
1620                         $n = 0;
1621                 } else {
1622                         $dbr = wfGetDB( DB_SLAVE );
1623                         $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1624                                 'ar_title' => $this->getDBkey() ), $fname );
1625                         if( $this->getNamespace() == NS_IMAGE ) {
1626                                 $n += $dbr->selectField( 'filearchive', 'COUNT(*)',
1627                                         array( 'fa_name' => $this->getDBkey() ), $fname );
1628                         }
1629                 }
1630                 return (int)$n;
1631         }
1632
1633         /**
1634          * Get the article ID for this Title from the link cache,
1635          * adding it if necessary
1636          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1637          *      for update
1638          * @return int the ID
1639          */
1640         public function getArticleID( $flags = 0 ) {
1641                 $linkCache =& LinkCache::singleton();
1642                 if ( $flags & GAID_FOR_UPDATE ) {
1643                         $oldUpdate = $linkCache->forUpdate( true );
1644                         $this->mArticleID = $linkCache->addLinkObj( $this );
1645                         $linkCache->forUpdate( $oldUpdate );
1646                 } else {
1647                         if ( -1 == $this->mArticleID ) {
1648                                 $this->mArticleID = $linkCache->addLinkObj( $this );
1649                         }
1650                 }
1651                 return $this->mArticleID;
1652         }
1653
1654         public function getLatestRevID() {
1655                 if ($this->mLatestID !== false)
1656                         return $this->mLatestID;
1657
1658                 $db = wfGetDB(DB_SLAVE);
1659                 return $this->mLatestID = $db->selectField( 'revision',
1660                         "max(rev_id)",
1661                         array('rev_page' => $this->getArticleID()),
1662                         'Title::getLatestRevID' );
1663         }
1664
1665         /**
1666          * This clears some fields in this object, and clears any associated
1667          * keys in the "bad links" section of the link cache.
1668          *
1669          * - This is called from Article::insertNewArticle() to allow
1670          * loading of the new page_id. It's also called from
1671          * Article::doDeleteArticle()
1672          *
1673          * @param int $newid the new Article ID
1674          */
1675         public function resetArticleID( $newid ) {
1676                 $linkCache =& LinkCache::singleton();
1677                 $linkCache->clearBadLink( $this->getPrefixedDBkey() );
1678
1679                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1680                 else { $this->mArticleID = $newid; }
1681                 $this->mRestrictionsLoaded = false;
1682                 $this->mRestrictions = array();
1683         }
1684
1685         /**
1686          * Updates page_touched for this page; called from LinksUpdate.php
1687          * @return bool true if the update succeded
1688          */
1689         public function invalidateCache() {
1690                 global $wgUseFileCache;
1691
1692                 if ( wfReadOnly() ) {
1693                         return;
1694                 }
1695
1696                 $dbw = wfGetDB( DB_MASTER );
1697                 $success = $dbw->update( 'page',
1698                         array( /* SET */
1699                                 'page_touched' => $dbw->timestamp()
1700                         ), array( /* WHERE */
1701                                 'page_namespace' => $this->getNamespace() ,
1702                                 'page_title' => $this->getDBkey()
1703                         ), 'Title::invalidateCache'
1704                 );
1705
1706                 if ($wgUseFileCache) {
1707                         $cache = new HTMLFileCache($this);
1708                         @unlink($cache->fileCacheName());
1709                 }
1710
1711                 return $success;
1712         }
1713
1714         /**
1715          * Prefix some arbitrary text with the namespace or interwiki prefix
1716          * of this object
1717          *
1718          * @param string $name the text
1719          * @return string the prefixed text
1720          * @private
1721          */
1722         /* private */ function prefix( $name ) {
1723                 $p = '';
1724                 if ( '' != $this->mInterwiki ) {
1725                         $p = $this->mInterwiki . ':';
1726                 }
1727                 if ( 0 != $this->mNamespace ) {
1728                         $p .= $this->getNsText() . ':';
1729                 }
1730                 return $p . $name;
1731         }
1732
1733         /**
1734          * Secure and split - main initialisation function for this object
1735          *
1736          * Assumes that mDbkeyform has been set, and is urldecoded
1737          * and uses underscores, but not otherwise munged.  This function
1738          * removes illegal characters, splits off the interwiki and
1739          * namespace prefixes, sets the other forms, and canonicalizes
1740          * everything.
1741          * @return bool true on success
1742          */
1743         private function secureAndSplit() {
1744                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1745
1746                 # Initialisation
1747                 static $rxTc = false;
1748                 if( !$rxTc ) {
1749                         # % is needed as well
1750                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/S';
1751                 }
1752
1753                 $this->mInterwiki = $this->mFragment = '';
1754                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1755
1756                 $dbkey = $this->mDbkeyform;
1757
1758                 # Strip Unicode bidi override characters.
1759                 # Sometimes they slip into cut-n-pasted page titles, where the
1760                 # override chars get included in list displays.
1761                 $dbkey = str_replace( "\xE2\x80\x8E", '', $dbkey ); // 200E LEFT-TO-RIGHT MARK
1762                 $dbkey = str_replace( "\xE2\x80\x8F", '', $dbkey ); // 200F RIGHT-TO-LEFT MARK
1763
1764                 # Clean up whitespace
1765                 #
1766                 $dbkey = preg_replace( '/[ _]+/', '_', $dbkey );
1767                 $dbkey = trim( $dbkey, '_' );
1768
1769                 if ( '' == $dbkey ) {
1770                         return false;
1771                 }
1772
1773                 if( false !== strpos( $dbkey, UTF8_REPLACEMENT ) ) {
1774                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1775                         return false;
1776                 }
1777
1778                 $this->mDbkeyform = $dbkey;
1779
1780                 # Initial colon indicates main namespace rather than specified default
1781                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
1782                 if ( ':' == $dbkey{0} ) {
1783                         $this->mNamespace = NS_MAIN;
1784                         $dbkey = substr( $dbkey, 1 ); # remove the colon but continue processing
1785                         $dbkey = trim( $dbkey, '_' ); # remove any subsequent whitespace
1786                 }
1787
1788                 # Namespace or interwiki prefix
1789                 $firstPass = true;
1790                 do {
1791                         $m = array();
1792                         if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $dbkey, $m ) ) {
1793                                 $p = $m[1];
1794                                 if ( $ns = $wgContLang->getNsIndex( $p )) {
1795                                         # Ordinary namespace
1796                                         $dbkey = $m[2];
1797                                         $this->mNamespace = $ns;
1798                                 } elseif( $this->getInterwikiLink( $p ) ) {
1799                                         if( !$firstPass ) {
1800                                                 # Can't make a local interwiki link to an interwiki link.
1801                                                 # That's just crazy!
1802                                                 return false;
1803                                         }
1804
1805                                         # Interwiki link
1806                                         $dbkey = $m[2];
1807                                         $this->mInterwiki = $wgContLang->lc( $p );
1808
1809                                         # Redundant interwiki prefix to the local wiki
1810                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1811                                                 if( $dbkey == '' ) {
1812                                                         # Can't have an empty self-link
1813                                                         return false;
1814                                                 }
1815                                                 $this->mInterwiki = '';
1816                                                 $firstPass = false;
1817                                                 # Do another namespace split...
1818                                                 continue;
1819                                         }
1820
1821                                         # If there's an initial colon after the interwiki, that also
1822                                         # resets the default namespace
1823                                         if ( $dbkey !== '' && $dbkey[0] == ':' ) {
1824                                                 $this->mNamespace = NS_MAIN;
1825                                                 $dbkey = substr( $dbkey, 1 );
1826                                         }
1827                                 }
1828                                 # If there's no recognized interwiki or namespace,
1829                                 # then let the colon expression be part of the title.
1830                         }
1831                         break;
1832                 } while( true );
1833
1834                 # We already know that some pages won't be in the database!
1835                 #
1836                 if ( '' != $this->mInterwiki || NS_SPECIAL == $this->mNamespace ) {
1837                         $this->mArticleID = 0;
1838                 }
1839                 $fragment = strstr( $dbkey, '#' );
1840                 if ( false !== $fragment ) {
1841                         $this->setFragment( $fragment );
1842                         $dbkey = substr( $dbkey, 0, strlen( $dbkey ) - strlen( $fragment ) );
1843                         # remove whitespace again: prevents "Foo_bar_#"
1844                         # becoming "Foo_bar_"
1845                         $dbkey = preg_replace( '/_*$/', '', $dbkey );
1846                 }
1847
1848                 # Reject illegal characters.
1849                 #
1850                 if( preg_match( $rxTc, $dbkey ) ) {
1851                         return false;
1852                 }
1853
1854                 /**
1855                  * Pages with "/./" or "/../" appearing in the URLs will
1856                  * often be unreachable due to the way web browsers deal
1857                  * with 'relative' URLs. Forbid them explicitly.
1858                  */
1859                 if ( strpos( $dbkey, '.' ) !== false &&
1860                      ( $dbkey === '.' || $dbkey === '..' ||
1861                        strpos( $dbkey, './' ) === 0  ||
1862                        strpos( $dbkey, '../' ) === 0 ||
1863                        strpos( $dbkey, '/./' ) !== false ||
1864                        strpos( $dbkey, '/../' ) !== false ) )
1865                 {
1866                         return false;
1867                 }
1868
1869                 /**
1870                  * Magic tilde sequences? Nu-uh!
1871                  */
1872                 if( strpos( $dbkey, '~~~' ) !== false ) {
1873                         return false;
1874                 }
1875
1876                 /**
1877                  * Limit the size of titles to 255 bytes.
1878                  * This is typically the size of the underlying database field.
1879                  * We make an exception for special pages, which don't need to be stored
1880                  * in the database, and may edge over 255 bytes due to subpage syntax
1881                  * for long titles, e.g. [[Special:Block/Long name]]
1882                  */
1883                 if ( ( $this->mNamespace != NS_SPECIAL && strlen( $dbkey ) > 255 ) ||
1884                   strlen( $dbkey ) > 512 )
1885                 {
1886                         return false;
1887                 }
1888
1889                 /**
1890                  * Normally, all wiki links are forced to have
1891                  * an initial capital letter so [[foo]] and [[Foo]]
1892                  * point to the same place.
1893                  *
1894                  * Don't force it for interwikis, since the other
1895                  * site might be case-sensitive.
1896                  */
1897                 $this->mUserCaseDBKey = $dbkey;
1898                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1899                         $dbkey = $wgContLang->ucfirst( $dbkey );
1900                 }
1901
1902                 /**
1903                  * Can't make a link to a namespace alone...
1904                  * "empty" local links can only be self-links
1905                  * with a fragment identifier.
1906                  */
1907                 if( $dbkey == '' &&
1908                         $this->mInterwiki == '' &&
1909                         $this->mNamespace != NS_MAIN ) {
1910                         return false;
1911                 }
1912
1913                 // Any remaining initial :s are illegal.
1914                 if ( $dbkey !== '' && ':' == $dbkey{0} ) {
1915                         return false;
1916                 }
1917
1918                 # Fill fields
1919                 $this->mDbkeyform = $dbkey;
1920                 $this->mUrlform = wfUrlencode( $dbkey );
1921
1922                 $this->mTextform = str_replace( '_', ' ', $dbkey );
1923
1924                 return true;
1925         }
1926
1927         /**
1928          * Set the fragment for this title
1929          * This is kind of bad, since except for this rarely-used function, Title objects
1930          * are immutable. The reason this is here is because it's better than setting the
1931          * members directly, which is what Linker::formatComment was doing previously.
1932          *
1933          * @param string $fragment text
1934          * @todo clarify whether access is supposed to be public (was marked as "kind of public")
1935          */
1936         public function setFragment( $fragment ) {
1937                 $this->mFragment = str_replace( '_', ' ', substr( $fragment, 1 ) );
1938         }
1939
1940         /**
1941          * Get a Title object associated with the talk page of this article
1942          * @return Title the object for the talk page
1943          */
1944         public function getTalkPage() {
1945                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1946         }
1947
1948         /**
1949          * Get a title object associated with the subject page of this
1950          * talk page
1951          *
1952          * @return Title the object for the subject page
1953          */
1954         public function getSubjectPage() {
1955                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1956         }
1957
1958         /**
1959          * Get an array of Title objects linking to this Title
1960          * Also stores the IDs in the link cache.
1961          *
1962          * WARNING: do not use this function on arbitrary user-supplied titles!
1963          * On heavily-used templates it will max out the memory.
1964          *
1965          * @param string $options may be FOR UPDATE
1966          * @return array the Title objects linking here
1967          */
1968         public function getLinksTo( $options = '', $table = 'pagelinks', $prefix = 'pl' ) {
1969                 $linkCache =& LinkCache::singleton();
1970
1971                 if ( $options ) {
1972                         $db = wfGetDB( DB_MASTER );
1973                 } else {
1974                         $db = wfGetDB( DB_SLAVE );
1975                 }
1976
1977                 $res = $db->select( array( 'page', $table ),
1978                         array( 'page_namespace', 'page_title', 'page_id' ),
1979                         array(
1980                                 "{$prefix}_from=page_id",
1981                                 "{$prefix}_namespace" => $this->getNamespace(),
1982                                 "{$prefix}_title"     => $this->getDbKey() ),
1983                         'Title::getLinksTo',
1984                         $options );
1985
1986                 $retVal = array();
1987                 if ( $db->numRows( $res ) ) {
1988                         while ( $row = $db->fetchObject( $res ) ) {
1989                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1990                                         $linkCache->addGoodLinkObj( $row->page_id, $titleObj );
1991                                         $retVal[] = $titleObj;
1992                                 }
1993                         }
1994                 }
1995                 $db->freeResult( $res );
1996                 return $retVal;
1997         }
1998
1999         /**
2000          * Get an array of Title objects using this Title as a template
2001          * Also stores the IDs in the link cache.
2002          *
2003          * WARNING: do not use this function on arbitrary user-supplied titles!
2004          * On heavily-used templates it will max out the memory.
2005          *
2006          * @param string $options may be FOR UPDATE
2007          * @return array the Title objects linking here
2008          */
2009         public function getTemplateLinksTo( $options = '' ) {
2010                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
2011         }
2012
2013         /**
2014          * Get an array of Title objects referring to non-existent articles linked from this page
2015          *
2016          * @param string $options may be FOR UPDATE
2017          * @return array the Title objects
2018          */
2019         public function getBrokenLinksFrom( $options = '' ) {
2020                 if ( $options ) {
2021                         $db = wfGetDB( DB_MASTER );
2022                 } else {
2023                         $db = wfGetDB( DB_SLAVE );
2024                 }
2025
2026                 $res = $db->safeQuery(
2027                           "SELECT pl_namespace, pl_title
2028                              FROM !
2029                         LEFT JOIN !
2030                                ON pl_namespace=page_namespace
2031                               AND pl_title=page_title
2032                             WHERE pl_from=?
2033                               AND page_namespace IS NULL
2034                                   !",
2035                         $db->tableName( 'pagelinks' ),
2036                         $db->tableName( 'page' ),
2037                         $this->getArticleId(),
2038                         $options );
2039
2040                 $retVal = array();
2041                 if ( $db->numRows( $res ) ) {
2042                         while ( $row = $db->fetchObject( $res ) ) {
2043                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
2044                         }
2045                 }
2046                 $db->freeResult( $res );
2047                 return $retVal;
2048         }
2049
2050
2051         /**
2052          * Get a list of URLs to purge from the Squid cache when this
2053          * page changes
2054          *
2055          * @return array the URLs
2056          */
2057         public function getSquidURLs() {
2058                 global $wgContLang;
2059
2060                 $urls = array(
2061                         $this->getInternalURL(),
2062                         $this->getInternalURL( 'action=history' )
2063                 );
2064
2065                 // purge variant urls as well
2066                 if($wgContLang->hasVariants()){
2067                         $variants = $wgContLang->getVariants();
2068                         foreach($variants as $vCode){
2069                                 if($vCode==$wgContLang->getCode()) continue; // we don't want default variant
2070                                 $urls[] = $this->getInternalURL('',$vCode);
2071                         }
2072                 }
2073
2074                 return $urls;
2075         }
2076
2077         public function purgeSquid() {
2078                 global $wgUseSquid;
2079                 if ( $wgUseSquid ) {
2080                         $urls = $this->getSquidURLs();
2081                         $u = new SquidUpdate( $urls );
2082                         $u->doUpdate();
2083                 }
2084         }
2085
2086         /**
2087          * Move this page without authentication
2088          * @param Title &$nt the new page Title
2089          */
2090         public function moveNoAuth( &$nt ) {
2091                 return $this->moveTo( $nt, false );
2092         }
2093
2094         /**
2095          * Check whether a given move operation would be valid.
2096          * Returns true if ok, or a message key string for an error message
2097          * if invalid. (Scarrrrry ugly interface this.)
2098          * @param Title &$nt the new title
2099          * @param bool $auth indicates whether $wgUser's permissions
2100          *      should be checked
2101          * @return mixed true on success, message name on failure
2102          */
2103         public function isValidMoveOperation( &$nt, $auth = true ) {
2104                 if( !$this or !$nt ) {
2105                         return 'badtitletext';
2106                 }
2107                 if( $this->equals( $nt ) ) {
2108                         return 'selfmove';
2109                 }
2110                 if( !$this->isMovable() || !$nt->isMovable() ) {
2111                         return 'immobile_namespace';
2112                 }
2113
2114                 $oldid = $this->getArticleID();
2115                 $newid = $nt->getArticleID();
2116
2117                 if ( strlen( $nt->getDBkey() ) < 1 ) {
2118                         return 'articleexists';
2119                 }
2120                 if ( ( '' == $this->getDBkey() ) ||
2121                          ( !$oldid ) ||
2122                      ( '' == $nt->getDBkey() ) ) {
2123                         return 'badarticleerror';
2124                 }
2125
2126                 if ( $auth && (
2127                                 !$this->userCan( 'edit' ) || !$nt->userCan( 'edit' ) ||
2128                                 !$this->userCan( 'move' ) || !$nt->userCan( 'move' ) ) ) {
2129                         return 'protectedpage';
2130                 }
2131
2132                 # The move is allowed only if (1) the target doesn't exist, or
2133                 # (2) the target is a redirect to the source, and has no history
2134                 # (so we can undo bad moves right after they're done).
2135
2136                 if ( 0 != $newid ) { # Target exists; check for validity
2137                         if ( ! $this->isValidMoveTarget( $nt ) ) {
2138                                 return 'articleexists';
2139                         }
2140                 }
2141                 return true;
2142         }
2143
2144         /**
2145          * Move a title to a new location
2146          * @param Title &$nt the new title
2147          * @param bool $auth indicates whether $wgUser's permissions
2148          *      should be checked
2149          * @return mixed true on success, message name on failure
2150          */
2151         public function moveTo( &$nt, $auth = true, $reason = '' ) {
2152                 $err = $this->isValidMoveOperation( $nt, $auth );
2153                 if( is_string( $err ) ) {
2154                         return $err;
2155                 }
2156
2157                 $pageid = $this->getArticleID();
2158                 if( $nt->exists() ) {
2159                         $this->moveOverExistingRedirect( $nt, $reason );
2160                         $pageCountChange = 0;
2161                 } else { # Target didn't exist, do normal move.
2162                         $this->moveToNewTitle( $nt, $reason );
2163                         $pageCountChange = 1;
2164                 }
2165                 $redirid = $this->getArticleID();
2166
2167                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
2168                 $dbw = wfGetDB( DB_MASTER );
2169                 $categorylinks = $dbw->tableName( 'categorylinks' );
2170                 $sql = "UPDATE $categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
2171                         " WHERE cl_from=" . $dbw->addQuotes( $pageid ) .
2172                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
2173                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
2174
2175                 # Update watchlists
2176
2177                 $oldnamespace = $this->getNamespace() & ~1;
2178                 $newnamespace = $nt->getNamespace() & ~1;
2179                 $oldtitle = $this->getDBkey();
2180                 $newtitle = $nt->getDBkey();
2181
2182                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
2183                         WatchedItem::duplicateEntries( $this, $nt );
2184                 }
2185
2186                 # Update search engine
2187                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
2188                 $u->doUpdate();
2189                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
2190                 $u->doUpdate();
2191
2192                 # Update site_stats
2193                 if( $this->isContentPage() && !$nt->isContentPage() ) {
2194                         # No longer a content page
2195                         # Not viewed, edited, removing
2196                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange );
2197                 } elseif( !$this->isContentPage() && $nt->isContentPage() ) {
2198                         # Now a content page
2199                         # Not viewed, edited, adding
2200                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
2201                 } elseif( $pageCountChange ) {
2202                         # Redirect added
2203                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
2204                 } else {
2205                         # Nothing special
2206                         $u = false;
2207                 }
2208                 if( $u )
2209                         $u->doUpdate();
2210
2211                 global $wgUser;
2212                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
2213                 return true;
2214         }
2215
2216         /**
2217          * Move page to a title which is at present a redirect to the
2218          * source page
2219          *
2220          * @param Title &$nt the page to move to, which should currently
2221          *      be a redirect
2222          */
2223         private function moveOverExistingRedirect( &$nt, $reason = '' ) {
2224                 global $wgUseSquid;
2225                 $fname = 'Title::moveOverExistingRedirect';
2226                 $comment = wfMsgForContent( '1movedto2_redir', $this->getPrefixedText(), $nt->getPrefixedText() );
2227
2228                 if ( $reason ) {
2229                         $comment .= ": $reason";
2230                 }
2231
2232                 $now = wfTimestampNow();
2233                 $newid = $nt->getArticleID();
2234                 $oldid = $this->getArticleID();
2235                 $dbw = wfGetDB( DB_MASTER );
2236                 $linkCache =& LinkCache::singleton();
2237
2238                 # Delete the old redirect. We don't save it to history since
2239                 # by definition if we've got here it's rather uninteresting.
2240                 # We have to remove it so that the next step doesn't trigger
2241                 # a conflict on the unique namespace+title index...
2242                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
2243
2244                 # Save a null revision in the page's history notifying of the move
2245                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2246                 $nullRevId = $nullRevision->insertOn( $dbw );
2247
2248                 # Change the name of the target page:
2249                 $dbw->update( 'page',
2250                         /* SET */ array(
2251                                 'page_touched'   => $dbw->timestamp($now),
2252                                 'page_namespace' => $nt->getNamespace(),
2253                                 'page_title'     => $nt->getDBkey(),
2254                                 'page_latest'    => $nullRevId,
2255                         ),
2256                         /* WHERE */ array( 'page_id' => $oldid ),
2257                         $fname
2258                 );
2259                 $linkCache->clearLink( $nt->getPrefixedDBkey() );
2260
2261                 # Recreate the redirect, this time in the other direction.
2262                 $mwRedir = MagicWord::get( 'redirect' );
2263                 $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2264                 $redirectArticle = new Article( $this );
2265                 $newid = $redirectArticle->insertOn( $dbw );
2266                 $redirectRevision = new Revision( array(
2267                         'page'    => $newid,
2268                         'comment' => $comment,
2269                         'text'    => $redirectText ) );
2270                 $redirectRevision->insertOn( $dbw );
2271                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2272                 $linkCache->clearLink( $this->getPrefixedDBkey() );
2273
2274                 # Log the move
2275                 $log = new LogPage( 'move' );
2276                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
2277
2278                 # Now, we record the link from the redirect to the new title.
2279                 # It should have no other outgoing links...
2280                 $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
2281                 $dbw->insert( 'pagelinks',
2282                         array(
2283                                 'pl_from'      => $newid,
2284                                 'pl_namespace' => $nt->getNamespace(),
2285                                 'pl_title'     => $nt->getDbKey() ),
2286                         $fname );
2287
2288                 # Purge squid
2289                 if ( $wgUseSquid ) {
2290                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
2291                         $u = new SquidUpdate( $urls );
2292                         $u->doUpdate();
2293                 }
2294         }
2295
2296         /**
2297          * Move page to non-existing title.
2298          * @param Title &$nt the new Title
2299          */
2300         private function moveToNewTitle( &$nt, $reason = '' ) {
2301                 global $wgUseSquid;
2302                 $fname = 'MovePageForm::moveToNewTitle';
2303                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
2304                 if ( $reason ) {
2305                         $comment .= ": $reason";
2306                 }
2307
2308                 $newid = $nt->getArticleID();
2309                 $oldid = $this->getArticleID();
2310                 $dbw = wfGetDB( DB_MASTER );
2311                 $now = $dbw->timestamp();
2312                 $linkCache =& LinkCache::singleton();
2313
2314                 # Save a null revision in the page's history notifying of the move
2315                 $nullRevision = Revision::newNullRevision( $dbw, $oldid, $comment, true );
2316                 $nullRevId = $nullRevision->insertOn( $dbw );
2317
2318                 # Rename cur entry
2319                 $dbw->update( 'page',
2320                         /* SET */ array(
2321                                 'page_touched'   => $now,
2322                                 'page_namespace' => $nt->getNamespace(),
2323                                 'page_title'     => $nt->getDBkey(),
2324                                 'page_latest'    => $nullRevId,
2325                         ),
2326                         /* WHERE */ array( 'page_id' => $oldid ),
2327                         $fname
2328                 );
2329
2330                 $linkCache->clearLink( $nt->getPrefixedDBkey() );
2331
2332                 # Insert redirect
2333                 $mwRedir = MagicWord::get( 'redirect' );
2334                 $redirectText = $mwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
2335                 $redirectArticle = new Article( $this );
2336                 $newid = $redirectArticle->insertOn( $dbw );
2337                 $redirectRevision = new Revision( array(
2338                         'page'    => $newid,
2339                         'comment' => $comment,
2340                         'text'    => $redirectText ) );
2341                 $redirectRevision->insertOn( $dbw );
2342                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
2343                 $linkCache->clearLink( $this->getPrefixedDBkey() );
2344
2345                 # Log the move
2346                 $log = new LogPage( 'move' );
2347                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
2348
2349                 # Purge caches as per article creation
2350                 Article::onArticleCreate( $nt );
2351
2352                 # Record the just-created redirect's linking to the page
2353                 $dbw->insert( 'pagelinks',
2354                         array(
2355                                 'pl_from'      => $newid,
2356                                 'pl_namespace' => $nt->getNamespace(),
2357                                 'pl_title'     => $nt->getDBkey() ),
2358                         $fname );
2359
2360                 # Purge old title from squid
2361                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
2362                 $this->purgeSquid();
2363         }
2364
2365         /**
2366          * Checks if $this can be moved to a given Title
2367          * - Selects for update, so don't call it unless you mean business
2368          *
2369          * @param Title &$nt the new title to check
2370          */
2371         public function isValidMoveTarget( $nt ) {
2372
2373                 $fname = 'Title::isValidMoveTarget';
2374                 $dbw = wfGetDB( DB_MASTER );
2375
2376                 # Is it a redirect?
2377                 $id  = $nt->getArticleID();
2378                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
2379                         array( 'page_is_redirect','old_text','old_flags' ),
2380                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
2381                         $fname, 'FOR UPDATE' );
2382
2383                 if ( !$obj || 0 == $obj->page_is_redirect ) {
2384                         # Not a redirect
2385                         wfDebug( __METHOD__ . ": not a redirect\n" );
2386                         return false;
2387                 }
2388                 $text = Revision::getRevisionText( $obj );
2389
2390                 # Does the redirect point to the source?
2391                 # Or is it a broken self-redirect, usually caused by namespace collisions?
2392                 $m = array();
2393                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
2394                         $redirTitle = Title::newFromText( $m[1] );
2395                         if( !is_object( $redirTitle ) ||
2396                                 ( $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() &&
2397                                 $redirTitle->getPrefixedDBkey() != $nt->getPrefixedDBkey() ) ) {
2398                                 wfDebug( __METHOD__ . ": redirect points to other page\n" );
2399                                 return false;
2400                         }
2401                 } else {
2402                         # Fail safe
2403                         wfDebug( __METHOD__ . ": failsafe\n" );
2404                         return false;
2405                 }
2406
2407                 # Does the article have a history?
2408                 $row = $dbw->selectRow( array( 'page', 'revision'),
2409                         array( 'rev_id' ),
2410                         array( 'page_namespace' => $nt->getNamespace(),
2411                                 'page_title' => $nt->getDBkey(),
2412                                 'page_id=rev_page AND page_latest != rev_id'
2413                         ), $fname, 'FOR UPDATE'
2414                 );
2415
2416                 # Return true if there was no history
2417                 return $row === false;
2418         }
2419
2420         /**
2421          * Can this title be added to a user's watchlist?
2422          *
2423          * @return bool
2424          */
2425         public function isWatchable() {
2426                 return !$this->isExternal()
2427                         && Namespace::isWatchable( $this->getNamespace() );
2428         }
2429
2430         /**
2431          * Get categories to which this Title belongs and return an array of
2432          * categories' names.
2433          *
2434          * @return array an array of parents in the form:
2435          *      $parent => $currentarticle
2436          */
2437         public function getParentCategories() {
2438                 global $wgContLang;
2439
2440                 $titlekey = $this->getArticleId();
2441                 $dbr = wfGetDB( DB_SLAVE );
2442                 $categorylinks = $dbr->tableName( 'categorylinks' );
2443
2444                 # NEW SQL
2445                 $sql = "SELECT * FROM $categorylinks"
2446                      ." WHERE cl_from='$titlekey'"
2447                          ." AND cl_from <> '0'"
2448                          ." ORDER BY cl_sortkey";
2449
2450                 $res = $dbr->query ( $sql ) ;
2451
2452                 if($dbr->numRows($res) > 0) {
2453                         while ( $x = $dbr->fetchObject ( $res ) )
2454                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
2455                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
2456                         $dbr->freeResult ( $res ) ;
2457                 } else {
2458                         $data = '';
2459                 }
2460                 return $data;
2461         }
2462
2463         /**
2464          * Get a tree of parent categories
2465          * @param array $children an array with the children in the keys, to check for circular refs
2466          * @return array
2467          */
2468         public function getParentCategoryTree( $children = array() ) {
2469                 $parents = $this->getParentCategories();
2470
2471                 if($parents != '') {
2472                         foreach($parents as $parent => $current) {
2473                                 if ( array_key_exists( $parent, $children ) ) {
2474                                         # Circular reference
2475                                         $stack[$parent] = array();
2476                                 } else {
2477                                         $nt = Title::newFromText($parent);
2478                                         if ( $nt ) {
2479                                                 $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
2480                                         }
2481                                 }
2482                         }
2483                         return $stack;
2484                 } else {
2485                         return array();
2486                 }
2487         }
2488
2489
2490         /**
2491          * Get an associative array for selecting this title from
2492          * the "page" table
2493          *
2494          * @return array
2495          */
2496         public function pageCond() {
2497                 return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
2498         }
2499
2500         /**
2501          * Get the revision ID of the previous revision
2502          *
2503          * @param integer $revision  Revision ID. Get the revision that was before this one.
2504          * @return integer $oldrevision|false
2505          */
2506         public function getPreviousRevisionID( $revision ) {
2507                 $dbr = wfGetDB( DB_SLAVE );
2508                 return $dbr->selectField( 'revision', 'rev_id',
2509                         'rev_page=' . intval( $this->getArticleId() ) .
2510                         ' AND rev_id<' . intval( $revision ) . ' ORDER BY rev_id DESC' );
2511         }
2512
2513         /**
2514          * Get the revision ID of the next revision
2515          *
2516          * @param integer $revision  Revision ID. Get the revision that was after this one.
2517          * @return integer $oldrevision|false
2518          */
2519         public function getNextRevisionID( $revision ) {
2520                 $dbr = wfGetDB( DB_SLAVE );
2521                 return $dbr->selectField( 'revision', 'rev_id',
2522                         'rev_page=' . intval( $this->getArticleId() ) .
2523                         ' AND rev_id>' . intval( $revision ) . ' ORDER BY rev_id' );
2524         }
2525
2526         /**
2527          * Get the number of revisions between the given revision IDs.
2528          *
2529          * @param integer $old  Revision ID.
2530          * @param integer $new  Revision ID.
2531          * @return integer  Number of revisions between these IDs.
2532          */
2533         public function countRevisionsBetween( $old, $new ) {
2534                 $dbr = wfGetDB( DB_SLAVE );
2535                 return $dbr->selectField( 'revision', 'count(*)',
2536                         'rev_page = ' . intval( $this->getArticleId() ) .
2537                         ' AND rev_id > ' . intval( $old ) .
2538                         ' AND rev_id < ' . intval( $new ) );
2539         }
2540
2541         /**
2542          * Compare with another title.
2543          *
2544          * @param Title $title
2545          * @return bool
2546          */
2547         public function equals( $title ) {
2548                 // Note: === is necessary for proper matching of number-like titles.
2549                 return $this->getInterwiki() === $title->getInterwiki()
2550                         && $this->getNamespace() == $title->getNamespace()
2551                         && $this->getDbkey() === $title->getDbkey();
2552         }
2553
2554         /**
2555          * Return a string representation of this title
2556          *
2557          * @return string
2558          */
2559         public function __toString() {
2560                 return $this->getPrefixedText();
2561         }
2562
2563         /**
2564          * Check if page exists
2565          * @return bool
2566          */
2567         public function exists() {
2568                 return $this->getArticleId() != 0;
2569         }
2570
2571         /**
2572          * Do we know that this title definitely exists, or should we otherwise
2573          * consider that it exists?
2574          *
2575          * @return bool
2576          */
2577         public function isAlwaysKnown() {
2578                 return $this->isExternal()
2579                         || ( $this->mNamespace == NS_MAIN && $this->mDbkeyform == '' )
2580                         || ( $this->mNamespace == NS_MEDIAWIKI && wfMsgWeirdKey( $this->mDbkeyform ) );
2581         }
2582
2583         /**
2584          * Update page_touched timestamps and send squid purge messages for
2585          * pages linking to this title. May be sent to the job queue depending
2586          * on the number of links. Typically called on create and delete.
2587          */
2588         public function touchLinks() {
2589                 $u = new HTMLCacheUpdate( $this, 'pagelinks' );
2590                 $u->doUpdate();
2591
2592                 if ( $this->getNamespace() == NS_CATEGORY ) {
2593                         $u = new HTMLCacheUpdate( $this, 'categorylinks' );
2594                         $u->doUpdate();
2595                 }
2596         }
2597
2598         /**
2599          * Get the last touched timestamp
2600          */
2601         public function getTouched() {
2602                 $dbr = wfGetDB( DB_SLAVE );
2603                 $touched = $dbr->selectField( 'page', 'page_touched',
2604                         array(
2605                                 'page_namespace' => $this->getNamespace(),
2606                                 'page_title' => $this->getDBkey()
2607                         ), __METHOD__
2608                 );
2609                 return $touched;
2610         }
2611
2612         public function trackbackURL() {
2613                 global $wgTitle, $wgScriptPath, $wgServer;
2614
2615                 return "$wgServer$wgScriptPath/trackback.php?article="
2616                         . htmlspecialchars(urlencode($wgTitle->getPrefixedDBkey()));
2617         }
2618
2619         public function trackbackRDF() {
2620                 $url = htmlspecialchars($this->getFullURL());
2621                 $title = htmlspecialchars($this->getText());
2622                 $tburl = $this->trackbackURL();
2623
2624                 return "
2625 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
2626          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
2627          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
2628 <rdf:Description
2629    rdf:about=\"$url\"
2630    dc:identifier=\"$url\"
2631    dc:title=\"$title\"
2632    trackback:ping=\"$tburl\" />
2633 </rdf:RDF>";
2634         }
2635
2636         /**
2637          * Generate strings used for xml 'id' names in monobook tabs
2638          * @return string
2639          */
2640         public function getNamespaceKey() {
2641                 global $wgContLang;
2642                 switch ($this->getNamespace()) {
2643                         case NS_MAIN:
2644                         case NS_TALK:
2645                                 return 'nstab-main';
2646                         case NS_USER:
2647                         case NS_USER_TALK:
2648                                 return 'nstab-user';
2649                         case NS_MEDIA:
2650                                 return 'nstab-media';
2651                         case NS_SPECIAL:
2652                                 return 'nstab-special';
2653                         case NS_PROJECT:
2654                         case NS_PROJECT_TALK:
2655                                 return 'nstab-project';
2656                         case NS_IMAGE:
2657                         case NS_IMAGE_TALK:
2658                                 return 'nstab-image';
2659                         case NS_MEDIAWIKI:
2660                         case NS_MEDIAWIKI_TALK:
2661                                 return 'nstab-mediawiki';
2662                         case NS_TEMPLATE:
2663                         case NS_TEMPLATE_TALK:
2664                                 return 'nstab-template';
2665                         case NS_HELP:
2666                         case NS_HELP_TALK:
2667                                 return 'nstab-help';
2668                         case NS_CATEGORY:
2669                         case NS_CATEGORY_TALK:
2670                                 return 'nstab-category';
2671                         default:
2672                                 return 'nstab-' . $wgContLang->lc( $this->getSubjectNsText() );
2673                 }
2674         }
2675
2676         /**
2677          * Returns true if this title resolves to the named special page
2678          * @param string $name The special page name
2679          */
2680         public function isSpecial( $name ) {
2681                 if ( $this->getNamespace() == NS_SPECIAL ) {
2682                         list( $thisName, /* $subpage */ ) = SpecialPage::resolveAliasWithSubpage( $this->getDBkey() );
2683                         if ( $name == $thisName ) {
2684                                 return true;
2685                         }
2686                 }
2687                 return false;
2688         }
2689
2690         /**
2691          * If the Title refers to a special page alias which is not the local default,
2692          * returns a new Title which points to the local default. Otherwise, returns $this.
2693          */
2694         public function fixSpecialName() {
2695                 if ( $this->getNamespace() == NS_SPECIAL ) {
2696                         $canonicalName = SpecialPage::resolveAlias( $this->mDbkeyform );
2697                         if ( $canonicalName ) {
2698                                 $localName = SpecialPage::getLocalNameFor( $canonicalName );
2699                                 if ( $localName != $this->mDbkeyform ) {
2700                                         return Title::makeTitle( NS_SPECIAL, $localName );
2701                                 }
2702                         }
2703                 }
2704                 return $this;
2705         }
2706
2707         /**
2708          * Is this Title in a namespace which contains content?
2709          * In other words, is this a content page, for the purposes of calculating
2710          * statistics, etc?
2711          *
2712          * @return bool
2713          */
2714         public function isContentPage() {
2715                 return Namespace::isContent( $this->getNamespace() );
2716         }
2717
2718 }
2719
2720