includes/Title.php

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