includes/Title.php

   1 <?php
   2 /**
   3  * $Id$
   4  * See title.doc
   5  *
   6  * @package MediaWiki
   7  */
   8
   9 /** */
  10 require_once( 'normal/UtfNormal.php' );
  11
  12 $wgTitleInterwikiCache = array();
  13 define ( 'GAID_FOR_UPDATE', 1 );
  14
  15 /**
  16  * Title class
  17  * - Represents a title, which may contain an interwiki designation or namespace
  18  * - Can fetch various kinds of data from the database, albeit inefficiently.
  19  *
  20  * @package MediaWiki
  21  */
  22 class Title {
  23         /**
  24          * All member variables should be considered private
  25          * Please use the accessor functions
  26          */
  27
  28          /**#@+
  29          * @access private
  30          */
  31
  32         var $mTextform;           # Text form (spaces not underscores) of the main part
  33         var $mUrlform;            # URL-encoded form of the main part
  34         var $mDbkeyform;          # Main part with underscores
  35         var $mNamespace;          # Namespace index, i.e. one of the NS_xxxx constants
  36         var $mInterwiki;          # Interwiki prefix (or null string)
  37         var $mFragment;           # Title fragment (i.e. the bit after the #)
  38         var $mArticleID;          # Article ID, fetched from the link cache on demand
  39         var $mRestrictions;       # Array of groups allowed to edit this article
  40                               # Only null or "sysop" are supported
  41         var $mRestrictionsLoaded; # Boolean for initialisation on demand
  42         var $mPrefixedText;       # Text form including namespace/interwiki, initialised on demand
  43         var $mDefaultNamespace;   # Namespace index when there is no namespace
  44                               # Zero except in {{transclusion}} tags
  45         /**#@-*/
  46
  47
  48         /**
  49          * Constructor
  50          * @access private
  51          */
  52         /* private */ function Title() {
  53                 $this->mInterwiki = $this->mUrlform =
  54                 $this->mTextform = $this->mDbkeyform = '';
  55                 $this->mArticleID = -1;
  56                 $this->mNamespace = 0;
  57                 $this->mRestrictionsLoaded = false;
  58                 $this->mRestrictions = array();
  59                 $this->mDefaultNamespace = 0;
  60         }
  61
  62         /**
  63          * Create a new Title from a prefixed DB key
  64          * @param string $key The database key, which has underscores
  65          *      instead of spaces, possibly including namespace and
  66          *      interwiki prefixes
  67          * @return Title the new object, or NULL on an error
  68          * @static
  69          * @access public
  70          */
  71         /* static */ function newFromDBkey( $key ) {
  72                 $t = new Title();
  73                 $t->mDbkeyform = $key;
  74                 if( $t->secureAndSplit() )
  75                         return $t;
  76                 else
  77                         return NULL;
  78         }
  79
  80         /**
  81          * Create a new Title from text, such as what one would
  82          * find in a link. Decodes any HTML entities in the text.
  83          *
  84          * @param string $text the link text; spaces, prefixes,
  85          *      and an initial ':' indicating the main namespace
  86          *      are accepted
  87          * @param int $defaultNamespace the namespace to use if
  88          *      none is specified by a prefix
  89          * @return Title the new object, or NULL on an error
  90          * @static
  91          * @access public
  92          */
  93         /* static */ function newFromText( $text, $defaultNamespace = 0 ) {
  94                 $fname = 'Title::newFromText';
  95                 wfProfileIn( $fname );
  96
  97                 if( is_object( $text ) ) {
  98                         wfDebugDieBacktrace( 'Called with object instead of string.' );
  99                 }
 100                 global $wgInputEncoding;
 101                 $text = do_html_entity_decode( $text, ENT_COMPAT, $wgInputEncoding );
 102
 103                 $text = wfMungeToUtf8( $text );
 104
 105
 106                 # What was this for? TS 2004-03-03
 107                 # $text = urldecode( $text );
 108
 109                 $t = new Title();
 110                 $t->mDbkeyform = str_replace( ' ', '_', $text );
 111                 $t->mDefaultNamespace = $defaultNamespace;
 112
 113                 wfProfileOut( $fname );
 114                 if ( !is_object( $t ) ) {
 115                         var_dump( debug_backtrace() );
 116                 }
 117                 if( $t->secureAndSplit() ) {
 118                         return $t;
 119                 } else {
 120                         return NULL;
 121                 }
 122         }
 123
 124         /**
 125          * Create a new Title from URL-encoded text. Ensures that
 126          * the given title's length does not exceed the maximum.
 127          * @param string $url the title, as might be taken from a URL
 128          * @return Title the new object, or NULL on an error
 129          * @static
 130          * @access public
 131          */
 132         /* static */ function newFromURL( $url ) {
 133                 global $wgLang, $wgServer;
 134                 $t = new Title();
 135
 136                 # For compatibility with old buggy URLs. "+" is not valid in titles,
 137                 # but some URLs used it as a space replacement and they still come
 138                 # from some external search tools.
 139                 $s = str_replace( '+', ' ', $url );
 140
 141                 $t->mDbkeyform = str_replace( ' ', '_', $s );
 142                 if( $t->secureAndSplit() ) {
 143                         return $t;
 144                 } else {
 145                         return NULL;
 146                 }
 147         }
 148
 149         /**
 150          * Create a new Title from an article ID
 151          * @todo This is inefficiently implemented, the cur row is requested
 152          * but not used for anything else
 153          * @param int $id the cur_id corresponding to the Title to create
 154          * @return Title the new object, or NULL on an error
 155          * @access public
 156          */
 157         /* static */ function newFromID( $id ) {
 158                 $fname = 'Title::newFromID';
 159                 $dbr =& wfGetDB( DB_SLAVE );
 160                 $row = $dbr->getArray( 'cur', array( 'cur_namespace', 'cur_title' ),
 161                         array( 'cur_id' => $id ), $fname );
 162                 if ( $row !== false ) {
 163                         $title = Title::makeTitle( $row->cur_namespace, $row->cur_title );
 164                 } else {
 165                         $title = NULL;
 166                 }
 167                 return $title;
 168         }
 169
 170         /**
 171          * Create a new Title from a namespace index and a DB key.
 172          * It's assumed that $ns and $title are *valid*, for instance when
 173          * they came directly from the database or a special page name.
 174          * @param int $ns the namespace of the article
 175          * @param string $title the unprefixed database key form
 176          * @return Title the new object
 177          * @static
 178          * @access public
 179          */
 180         /* static */ function &makeTitle( $ns, $title ) {
 181                 $t =& new Title();
 182                 $t->mInterwiki = '';
 183                 $t->mFragment = '';
 184                 $t->mNamespace = IntVal( $ns );
 185                 $t->mDbkeyform = $title;
 186                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 187                 $t->mUrlform = wfUrlencode( $title );
 188                 $t->mTextform = str_replace( '_', ' ', $title );
 189                 return $t;
 190         }
 191
 192         /**
 193          * Create a new Title frrom a namespace index and a DB key.
 194          * The parameters will be checked for validity, which is a bit slower
 195          * than makeTitle() but safer for user-provided data.
 196          * @param int $ns the namespace of the article
 197          * @param string $title the database key form
 198          * @return Title the new object, or NULL on an error
 199          * @static
 200          * @access public
 201          */
 202         /* static */ function makeTitleSafe( $ns, $title ) {
 203                 $t = new Title();
 204                 $t->mDbkeyform = Title::makeName( $ns, $title );
 205                 if( $t->secureAndSplit() ) {
 206                         return $t;
 207                 } else {
 208                         return NULL;
 209                 }
 210         }
 211
 212         /**
 213          * Create a new Title for the Main Page
 214          * @static
 215          * @return Title the new object
 216          * @access public
 217          */
 218         /* static */ function newMainPage() {
 219                 return Title::newFromText( wfMsgForContent( 'mainpage' ) );
 220         }
 221
 222         /**
 223          * Create a new Title for a redirect
 224          * @param string $text the redirect title text
 225          * @return Title the new object, or NULL if the text is not a
 226          *      valid redirect
 227          * @static
 228          * @access public
 229          */
 230         /* static */ function newFromRedirect( $text ) {
 231                 global $wgMwRedir;
 232                 $rt = NULL;
 233                 if ( $wgMwRedir->matchStart( $text ) ) {
 234                         if ( preg_match( '/\\[\\[([^\\]\\|]+)[\\]\\|]/', $text, $m ) ) {
 235                                 # categories are escaped using : for example one can enter:
 236                                 # #REDIRECT [[:Category:Music]]. Need to remove it.
 237                                 if ( substr($m[1],0,1) == ':') {
 238                                         # We don't want to keep the ':'
 239                                         $m[1] = substr( $m[1], 1 );
 240                                 }
 241
 242                                 $rt = Title::newFromText( $m[1] );
 243                                 # Disallow redirects to Special:Userlogout
 244                                 if ( !is_null($rt) && $rt->getNamespace() == NS_SPECIAL && preg_match( '/^Userlogout/i', $rt->getText() ) ) {
 245                                         $rt = NULL;
 246                                 }
 247                         }
 248                 }
 249                 return $rt;
 250         }
 251
 252 #----------------------------------------------------------------------------
 253 #       Static functions
 254 #----------------------------------------------------------------------------
 255
 256         /**
 257          * Get the prefixed DB key associated with an ID
 258          * @param int $id the cur_id of the article
 259          * @return Title an object representing the article, or NULL
 260          *      if no such article was found
 261          * @static
 262          * @access public
 263          */
 264         /* static */ function nameOf( $id ) {
 265                 $fname = 'Title::nameOf';
 266                 $dbr =& wfGetDB( DB_SLAVE );
 267
 268                 $s = $dbr->getArray( 'cur', array( 'cur_namespace','cur_title' ),  array( 'cur_id' => $id ), $fname );
 269                 if ( $s === false ) { return NULL; }
 270
 271                 $n = Title::makeName( $s->cur_namespace, $s->cur_title );
 272                 return $n;
 273         }
 274
 275         /**
 276          * Get a regex character class describing the legal characters in a link
 277          * @return string the list of characters, not delimited
 278          * @static
 279          * @access public
 280          */
 281         /* static */ function legalChars() {
 282                 # Missing characters:
 283                 #  * []|# Needed for link syntax
 284                 #  * % and + are corrupted by Apache when they appear in the path
 285                 #
 286                 # % seems to work though
 287                 #
 288                 # The problem with % is that URLs are double-unescaped: once by Apache's
 289                 # path conversion code, and again by PHP. So %253F, for example, becomes "?".
 290                 # Our code does not double-escape to compensate for this, indeed double escaping
 291                 # would break if the double-escaped title was passed in the query string
 292                 # rather than the path. This is a minor security issue because articles can be
 293                 # created such that they are hard to view or edit. -- TS
 294                 #
 295                 # Theoretically 0x80-0x9F of ISO 8859-1 should be disallowed, but
 296                 # this breaks interlanguage links
 297
 298                 $set = " %!\"$&'()*,\\-.\\/0-9:;=?@A-Z\\\\^_`a-z~\\x80-\\xFF";
 299                 return $set;
 300         }
 301
 302         /**
 303          * Get a string representation of a title suitable for
 304          * including in a search index
 305          *
 306          * @param int $ns a namespace index
 307          * @param string $title text-form main part
 308          * @return string a stripped-down title string ready for the
 309          *      search index
 310          */
 311         /* static */ function indexTitle( $ns, $title ) {
 312                 global $wgDBminWordLen, $wgContLang;
 313                 require_once( 'SearchEngine.php' );
 314
 315                 $lc = SearchEngine::legalSearchChars() . '&#;';
 316                 $t = $wgContLang->stripForSearch( $title );
 317                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 318                 $t = strtolower( $t );
 319
 320                 # Handle 's, s'
 321                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 322                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 323
 324                 $t = preg_replace( "/\\s+/", ' ', $t );
 325
 326                 if ( $ns == Namespace::getImage() ) {
 327                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 328                 }
 329                 return trim( $t );
 330         }
 331
 332         /*
 333          * Make a prefixed DB key from a DB key and a namespace index
 334          * @param int $ns numerical representation of the namespace
 335          * @param string $title the DB key form the title
 336          * @return string the prefixed form of the title
 337          */
 338         /* static */ function makeName( $ns, $title ) {
 339                 global $wgContLang;
 340
 341                 $n = $wgContLang->getNsText( $ns );
 342                 if ( '' == $n ) { return $title; }
 343                 else { return $n.':'.$title; }
 344         }
 345
 346         /**
 347          * Returns the URL associated with an interwiki prefix
 348          * @param string $key the interwiki prefix (e.g. "MeatBall")
 349          * @return the associated URL, containing "$1", which should be
 350          *      replaced by an article title
 351          * @static (arguably)
 352          * @access public
 353          */
 354         function getInterwikiLink( $key ) {
 355                 global $wgMemc, $wgDBname, $wgInterwikiExpiry, $wgTitleInterwikiCache;
 356                 $fname = 'Title::getInterwikiLink';
 357                 $k = $wgDBname.':interwiki:'.$key;
 358
 359                 if( array_key_exists( $k, $wgTitleInterwikiCache ) )
 360                         return $wgTitleInterwikiCache[$k]->iw_url;
 361
 362                 $s = $wgMemc->get( $k );
 363                 # Ignore old keys with no iw_local
 364                 if( $s && isset( $s->iw_local ) ) {
 365                         $wgTitleInterwikiCache[$k] = $s;
 366                         return $s->iw_url;
 367                 }
 368                 $dbr =& wfGetDB( DB_SLAVE );
 369                 $res = $dbr->select( 'interwiki', array( 'iw_url', 'iw_local' ), array( 'iw_prefix' => $key ), $fname );
 370                 if(!$res) return '';
 371
 372                 $s = $dbr->fetchObject( $res );
 373                 if(!$s) {
 374                         # Cache non-existence: create a blank object and save it to memcached
 375                         $s = (object)false;
 376                         $s->iw_url = '';
 377                         $s->iw_local = 0;
 378                 }
 379                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 380                 $wgTitleInterwikiCache[$k] = $s;
 381                 return $s->iw_url;
 382         }
 383
 384         /**
 385          * Determine whether the object refers to a page within
 386          * this project.
 387          *
 388          * @return bool TRUE if this is an in-project interwiki link
 389          *      or a wikilink, FALSE otherwise
 390          * @access public
 391          */
 392         function isLocal() {
 393                 global $wgTitleInterwikiCache, $wgDBname;
 394
 395                 if ( $this->mInterwiki != '' ) {
 396                         # Make sure key is loaded into cache
 397                         $this->getInterwikiLink( $this->mInterwiki );
 398                         $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 399                         return (bool)($wgTitleInterwikiCache[$k]->iw_local);
 400                 } else {
 401                         return true;
 402                 }
 403         }
 404
 405         /**
 406          * Update the cur_touched field for an array of title objects
 407          * @todo Inefficient unless the IDs are already loaded into the
 408          *      link cache
 409          * @param array $titles an array of Title objects to be touched
 410          * @param string $timestamp the timestamp to use instead of the
 411          *      default current time
 412          * @static
 413          * @access public
 414          */
 415         /* static */ function touchArray( $titles, $timestamp = '' ) {
 416                 if ( count( $titles ) == 0 ) {
 417                         return;
 418                 }
 419                 $dbw =& wfGetDB( DB_MASTER );
 420                 if ( $timestamp == '' ) {
 421                         $timestamp = $dbw->timestamp();
 422                 }
 423                 $cur = $dbw->tableName( 'cur' );
 424                 $sql = "UPDATE $cur SET cur_touched='{$timestamp}' WHERE cur_id IN (";
 425                 $first = true;
 426
 427                 foreach ( $titles as $title ) {
 428                         if ( ! $first ) {
 429                                 $sql .= ',';
 430                         }
 431                         $first = false;
 432                         $sql .= $title->getArticleID();
 433                 }
 434                 $sql .= ')';
 435                 if ( ! $first ) {
 436                         $dbw->query( $sql, 'Title::touchArray' );
 437                 }
 438         }
 439
 440 #----------------------------------------------------------------------------
 441 #       Other stuff
 442 #----------------------------------------------------------------------------
 443
 444         /** Simple accessors */
 445         /**
 446          * Get the text form (spaces not underscores) of the main part
 447          * @return string
 448          * @access public
 449          */
 450         function getText() { return $this->mTextform; }
 451         /**
 452          * Get the URL-encoded form of the main part
 453          * @return string
 454          * @access public
 455          */
 456         function getPartialURL() { return $this->mUrlform; }
 457         /**
 458          * Get the main part with underscores
 459          * @return string
 460          * @access public
 461          */
 462         function getDBkey() { return $this->mDbkeyform; }
 463         /**
 464          * Get the namespace index, i.e. one of the NS_xxxx constants
 465          * @return int
 466          * @access public
 467          */
 468         function getNamespace() { return $this->mNamespace; }
 469         /**
 470          * Set the namespace index
 471          * @param int $n the namespace index, one of the NS_xxxx constants
 472          * @access public
 473          */
 474         function setNamespace( $n ) { $this->mNamespace = IntVal( $n ); }
 475         /**
 476          * Get the interwiki prefix (or null string)
 477          * @return string
 478          * @access public
 479          */
 480         function getInterwiki() { return $this->mInterwiki; }
 481         /**
 482          * Get the Title fragment (i.e. the bit after the #)
 483          * @return string
 484          * @access public
 485          */
 486         function getFragment() { return $this->mFragment; }
 487         /**
 488          * Get the default namespace index, for when there is no namespace
 489          * @return int
 490          * @access public
 491          */
 492         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 493
 494         /**
 495          * Get title for search index
 496          * @return string a stripped-down title string ready for the
 497          *      search index
 498          */
 499         function getIndexTitle() {
 500                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 501         }
 502
 503         /**
 504          * Get the prefixed database key form
 505          * @return string the prefixed title, with underscores and
 506          *      any interwiki and namespace prefixes
 507          * @access public
 508          */
 509         function getPrefixedDBkey() {
 510                 $s = $this->prefix( $this->mDbkeyform );
 511                 $s = str_replace( ' ', '_', $s );
 512                 return $s;
 513         }
 514
 515         /**
 516          * Get the prefixed title with spaces.
 517          * This is the form usually used for display
 518          * @return string the prefixed title, with spaces
 519          * @access public
 520          */
 521         function getPrefixedText() {
 522                 global $wgContLang;
 523                 if ( empty( $this->mPrefixedText ) ) {
 524                         $s = $this->prefix( $this->mTextform );
 525                         $s = str_replace( '_', ' ', $s );
 526                         $this->mPrefixedText = $s;
 527                 }
 528                 return $this->mPrefixedText;
 529         }
 530
 531         /**
 532          * Get the prefixed title with spaces, plus any fragment
 533          * (part beginning with '#')
 534          * @return string the prefixed title, with spaces and
 535          *      the fragment, including '#'
 536          * @access public
 537          */
 538         function getFullText() {
 539                 global $wgContLang;
 540                 $text = $this->getPrefixedText();
 541                 if( '' != $this->mFragment ) {
 542                         $text .= '#' . $this->mFragment;
 543                 }
 544                 return $text;
 545         }
 546
 547         /**
 548          * Get a URL-encoded title (not an actual URL) including interwiki
 549          * @return string the URL-encoded form
 550          * @access public
 551          */
 552         function getPrefixedURL() {
 553                 $s = $this->prefix( $this->mDbkeyform );
 554                 $s = str_replace( ' ', '_', $s );
 555
 556                 $s = wfUrlencode ( $s ) ;
 557
 558                 # Cleaning up URL to make it look nice -- is this safe?
 559                 $s = preg_replace( '/%3[Aa]/', ':', $s );
 560                 $s = preg_replace( '/%2[Ff]/', '/', $s );
 561                 $s = str_replace( '%28', '(', $s );
 562                 $s = str_replace( '%29', ')', $s );
 563
 564                 return $s;
 565         }
 566
 567         /**
 568          * Get a real URL referring to this title, with interwiki link and
 569          * fragment
 570          *
 571          * @param string $query an optional query string, not used
 572          *      for interwiki links
 573          * @return string the URL
 574          * @access public
 575          */
 576         function getFullURL( $query = '' ) {
 577                 global $wgContLang, $wgArticlePath, $wgServer, $wgScript;
 578
 579                 if ( '' == $this->mInterwiki ) {
 580                         $p = $wgArticlePath;
 581                         return $wgServer . $this->getLocalUrl( $query );
 582                 } else {
 583                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 584                         $namespace = $wgContLang->getNsText( $this->mNamespace );
 585                         if ( '' != $namespace ) {
 586                                 # Can this actually happen? Interwikis shouldn't be parsed.
 587                                 $namepace .= ':';
 588                         }
 589                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 590                         if ( '' != $this->mFragment ) {
 591                                 $url .= '#' . $this->mFragment;
 592                         }
 593                         return $url;
 594                 }
 595         }
 596
 597         /**
 598          * @deprecated
 599          */
 600         function getURL() {
 601                 die( 'Call to obsolete obsolete function Title::getURL()' );
 602         }
 603
 604         /**
 605          * Get a URL with no fragment or server name
 606          * @param string $query an optional query string; if not specified,
 607          *      $wgArticlePath will be used.
 608          * @return string the URL
 609          * @access public
 610          */
 611         function getLocalURL( $query = '' ) {
 612                 global $wgLang, $wgArticlePath, $wgScript;
 613
 614                 if ( $this->isExternal() ) {
 615                         return $this->getFullURL();
 616                 }
 617
 618                 $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 619                 if ( $query == '' ) {
 620                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 621                 } else {
 622                         if ( $query == '-' ) {
 623                                 $query = '';
 624                         }
 625                         if ( $wgScript != '' ) {
 626                                 $url = "{$wgScript}?title={$dbkey}&{$query}";
 627                         } else {
 628                                 # Top level wiki
 629                                 $url = "/{$dbkey}?{$query}";
 630                         }
 631                 }
 632                 return $url;
 633         }
 634
 635         /**
 636          * Get an HTML-escaped version of the URL form, suitable for
 637          * using in a link, without a server name or fragment
 638          * @param string $query an optional query string
 639          * @return string the URL
 640          * @access public
 641          */
 642         function escapeLocalURL( $query = '' ) {
 643                 return htmlspecialchars( $this->getLocalURL( $query ) );
 644         }
 645
 646         /**
 647          * Get an HTML-escaped version of the URL form, suitable for
 648          * using in a link, including the server name and fragment
 649          *
 650          * @return string the URL
 651          * @param string $query an optional query string
 652          * @access public
 653          */
 654         function escapeFullURL( $query = '' ) {
 655                 return htmlspecialchars( $this->getFullURL( $query ) );
 656         }
 657
 658         /**
 659          * Get the URL form for an internal link.
 660          * - Used in various Squid-related code, in case we have a different
 661          * internal hostname for the server from the exposed one.
 662          *
 663          * @param string $query an optional query string
 664          * @return string the URL
 665          * @access public
 666          */
 667         function getInternalURL( $query = '' ) {
 668                 global $wgInternalServer;
 669                 return $wgInternalServer . $this->getLocalURL( $query );
 670         }
 671
 672         /**
 673          * Get the edit URL for this Title
 674          * @return string the URL, or a null string if this is an
 675          *      interwiki link
 676          * @access public
 677          */
 678         function getEditURL() {
 679                 global $wgServer, $wgScript;
 680
 681                 if ( '' != $this->mInterwiki ) { return ''; }
 682                 $s = $this->getLocalURL( 'action=edit' );
 683
 684                 return $s;
 685         }
 686
 687         /**
 688          * Get the HTML-escaped displayable text form.
 689          * Used for the title field in <a> tags.
 690          * @return string the text, including any prefixes
 691          * @access public
 692          */
 693         function getEscapedText() {
 694                 return htmlspecialchars( $this->getPrefixedText() );
 695         }
 696
 697         /**
 698          * Is this Title interwiki?
 699          * @return boolean
 700          * @access public
 701          */
 702         function isExternal() { return ( '' != $this->mInterwiki ); }
 703
 704         /**
 705          * Does the title correspond to a protected article?
 706          * @return boolean
 707          * @access public
 708          */
 709         function isProtected() {
 710                 if ( -1 == $this->mNamespace ) { return true; }
 711                 $a = $this->getRestrictions();
 712                 if ( in_array( 'sysop', $a ) ) { return true; }
 713                 return false;
 714         }
 715
 716         /**
 717          * Is the page a log page, i.e. one where the history is messed up by
 718          * LogPage.php? This used to be used for suppressing diff links in
 719          * recent changes, but now that's done by setting a flag in the
 720          * recentchanges table. Hence, this probably is no longer used.
 721          *
 722          * @deprecated
 723          * @access public
 724          */
 725         function isLog() {
 726                 if ( $this->mNamespace != Namespace::getWikipedia() ) {
 727                         return false;
 728                 }
 729                 if ( ( 0 == strcmp( wfMsg( 'uploadlogpage' ), $this->mDbkeyform ) ) ||
 730                   ( 0 == strcmp( wfMsg( 'dellogpage' ), $this->mDbkeyform ) ) ) {
 731                         return true;
 732                 }
 733                 return false;
 734         }
 735
 736         /**
 737          * Is $wgUser is watching this page?
 738          * @return boolean
 739          * @access public
 740          */
 741         function userIsWatching() {
 742                 global $wgUser;
 743
 744                 if ( -1 == $this->mNamespace ) { return false; }
 745                 if ( 0 == $wgUser->getID() ) { return false; }
 746
 747                 return $wgUser->isWatched( $this );
 748         }
 749
 750         /**
 751          * Can $wgUser edit this page?
 752          * @return boolean
 753          * @access public
 754          */
 755         function userCanEdit() {
 756                 global $wgUser;
 757                 if ( -1 == $this->mNamespace ) { return false; }
 758                 if ( NS_MEDIAWIKI == $this->mNamespace && !$wgUser->isSysop() ) { return false; }
 759                 # if ( 0 == $this->getArticleID() ) { return false; }
 760                 if ( $this->mDbkeyform == '_' ) { return false; }
 761                 # protect global styles and js
 762                 if ( NS_MEDIAWIKI == $this->mNamespace
 763                      && preg_match("/\\.(css|js)$/", $this->mTextform )
 764                      && !$wgUser->isSysop() )
 765                 { return false; }
 766                 //if ( $this->isCssJsSubpage() and !$this->userCanEditCssJsSubpage() ) { return false; }
 767                 # protect css/js subpages of user pages
 768                 # XXX: this might be better using restrictions
 769                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
 770                 if( Namespace::getUser() == $this->mNamespace
 771                         and preg_match("/\\.(css|js)$/", $this->mTextform )
 772                         and !$wgUser->isSysop()
 773                         and !preg_match('/^'.preg_quote($wgUser->getName(), '/').'/', $this->mTextform) )
 774                 { return false; }
 775                 $ur = $wgUser->getRights();
 776                 foreach ( $this->getRestrictions() as $r ) {
 777                         if ( '' != $r && ( ! in_array( $r, $ur ) ) ) {
 778                                 return false;
 779                         }
 780                 }
 781                 return true;
 782         }
 783
 784         /**
 785          * Can $wgUser read this page?
 786          * @return boolean
 787          * @access public
 788          */
 789         function userCanRead() {
 790                 global $wgUser;
 791                 global $wgWhitelistRead;
 792
 793                 if( 0 != $wgUser->getID() ) return true;
 794                 if( !is_array( $wgWhitelistRead ) ) return true;
 795
 796                 $name = $this->getPrefixedText();
 797                 if( in_array( $name, $wgWhitelistRead ) ) return true;
 798
 799                 # Compatibility with old settings
 800                 if( $this->getNamespace() == NS_MAIN ) {
 801                         if( in_array( ':' . $name, $wgWhitelistRead ) ) return true;
 802                 }
 803                 return false;
 804         }
 805
 806         /**
 807          * Is this a .css or .js subpage of a user page?
 808          * @return bool
 809          * @access public
 810          */
 811         function isCssJsSubpage() {
 812                 return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
 813         }
 814         /**
 815          * Is this a .css subpage of a user page?
 816          * @return bool
 817          * @access public
 818          */
 819         function isCssSubpage() {
 820                 return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
 821         }
 822         /**
 823          * Is this a .js subpage of a user page?
 824          * @return bool
 825          * @access public
 826          */
 827         function isJsSubpage() {
 828                 return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
 829         }
 830         /**
 831          * Protect css/js subpages of user pages: can $wgUser edit
 832          * this page?
 833          *
 834          * @return boolean
 835          * @todo XXX: this might be better using restrictions
 836          * @access public
 837          */
 838         function userCanEditCssJsSubpage() {
 839                 global $wgUser;
 840                 return ( $wgUser->isSysop() or preg_match('/^'.preg_quote($wgUser->getName()).'/', $this->mTextform) );
 841         }
 842
 843         /**
 844          * Accessor/initialisation for mRestrictions
 845          * @return array the array of groups allowed to edit this article
 846          * @access public
 847          */
 848         function getRestrictions() {
 849                 $id = $this->getArticleID();
 850                 if ( 0 == $id ) { return array(); }
 851
 852                 if ( ! $this->mRestrictionsLoaded ) {
 853                         $dbr =& wfGetDB( DB_SLAVE );
 854                         $res = $dbr->getField( 'cur', 'cur_restrictions', 'cur_id='.$id );
 855                         $this->mRestrictions = explode( ',', trim( $res ) );
 856                         $this->mRestrictionsLoaded = true;
 857                 }
 858                 return $this->mRestrictions;
 859         }
 860
 861         /**
 862          * Is there a version of this page in the deletion archive?
 863          * @return int the number of archived revisions
 864          * @access public
 865          */
 866         function isDeleted() {
 867                 $fname = 'Title::isDeleted';
 868                 $dbr =& wfGetDB( DB_SLAVE );
 869                 $n = $dbr->getField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
 870                         'ar_title' => $this->getDBkey() ), $fname );
 871                 return (int)$n;
 872         }
 873
 874         /**
 875          * Get the article ID for this Title from the link cache,
 876          * adding it if necessary
 877          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
 878          *      for update
 879          * @return int the ID
 880          * @access public
 881          */
 882         function getArticleID( $flags = 0 ) {
 883                 global $wgLinkCache;
 884
 885                 if ( $flags & GAID_FOR_UPDATE ) {
 886                         $oldUpdate = $wgLinkCache->forUpdate( true );
 887                         $this->mArticleID = $wgLinkCache->addLinkObj( $this );
 888                         $wgLinkCache->forUpdate( $oldUpdate );
 889                 } else {
 890                         if ( -1 == $this->mArticleID ) {
 891                                 $this->mArticleID = $wgLinkCache->addLinkObj( $this );
 892                         }
 893                 }
 894                 return $this->mArticleID;
 895         }
 896
 897         /**
 898          * This clears some fields in this object, and clears any associated
 899          * keys in the "bad links" section of $wgLinkCache.
 900          *
 901          * - This is called from Article::insertNewArticle() to allow
 902          * loading of the new cur_id. It's also called from
 903          * Article::doDeleteArticle()
 904          *
 905          * @param int $newid the new Article ID
 906          * @access public
 907          */
 908         function resetArticleID( $newid ) {
 909                 global $wgLinkCache;
 910                 $wgLinkCache->clearBadLink( $this->getPrefixedDBkey() );
 911
 912                 if ( 0 == $newid ) { $this->mArticleID = -1; }
 913                 else { $this->mArticleID = $newid; }
 914                 $this->mRestrictionsLoaded = false;
 915                 $this->mRestrictions = array();
 916         }
 917
 918         /**
 919          * Updates cur_touched for this page; called from LinksUpdate.php
 920          * @return bool true if the update succeded
 921          * @access public
 922          */
 923         function invalidateCache() {
 924                 $now = wfTimestampNow();
 925                 $dbw =& wfGetDB( DB_MASTER );
 926                 $success = $dbw->updateArray( 'cur',
 927                         array( /* SET */
 928                                 'cur_touched' => $dbw->timestamp()
 929                         ), array( /* WHERE */
 930                                 'cur_namespace' => $this->getNamespace() ,
 931                                 'cur_title' => $this->getDBkey()
 932                         ), 'Title::invalidateCache'
 933                 );
 934                 return $success;
 935         }
 936
 937         /**
 938          * Prefix some arbitrary text with the namespace or interwiki prefix
 939          * of this object
 940          *
 941          * @param string $name the text
 942          * @return string the prefixed text
 943          * @access private
 944          */
 945         /* private */ function prefix( $name ) {
 946                 global $wgContLang;
 947
 948                 $p = '';
 949                 if ( '' != $this->mInterwiki ) {
 950                         $p = $this->mInterwiki . ':';
 951                 }
 952                 if ( 0 != $this->mNamespace ) {
 953                         $p .= $wgContLang->getNsText( $this->mNamespace ) . ':';
 954                 }
 955                 return $p . $name;
 956         }
 957
 958         /**
 959          * Secure and split - main initialisation function for this object
 960          *
 961          * Assumes that mDbkeyform has been set, and is urldecoded
 962          * and uses underscores, but not otherwise munged.  This function
 963          * removes illegal characters, splits off the interwiki and
 964          * namespace prefixes, sets the other forms, and canonicalizes
 965          * everything.
 966          * @return bool true on success
 967          * @access private
 968          */
 969         /* private */ function secureAndSplit()
 970         {
 971                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
 972                 $fname = 'Title::secureAndSplit';
 973                 wfProfileIn( $fname );
 974
 975                 static $imgpre = false;
 976                 static $rxTc = false;
 977
 978                 # Initialisation
 979                 if ( $imgpre === false ) {
 980                         $imgpre = ':' . $wgContLang->getNsText( Namespace::getImage() ) . ':';
 981                         # % is needed as well
 982                         $rxTc = '/[^' . Title::legalChars() . ']/';
 983                 }
 984
 985                 $this->mInterwiki = $this->mFragment = '';
 986                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
 987
 988                 # Clean up whitespace
 989                 #
 990                 $t = preg_replace( "/[\\s_]+/", '_', $this->mDbkeyform );
 991                 $t = preg_replace( '/^_*(.*?)_*$/', '$1', $t );
 992
 993                 if ( '' == $t ) {
 994                         wfProfileOut( $fname );
 995                         return false;
 996                 }
 997
 998                 global $wgUseLatin1;
 999                 if( !$wgUseLatin1 &&  false !== strpos( $t, UTF8_REPLACEMENT ) ) {
1000                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1001                         wfProfileOut( $fname );
1002                         return false;
1003                 }
1004
1005                 $this->mDbkeyform = $t;
1006                 $done = false;
1007
1008                 # :Image: namespace
1009                 if ( 0 == strncasecmp( $imgpre, $t, strlen( $imgpre ) ) ) {
1010                         $t = substr( $t, 1 );
1011                 }
1012
1013                 # Initial colon indicating main namespace
1014                 if ( ':' == $t{0} ) {
1015                         $r = substr( $t, 1 );
1016                         $this->mNamespace = NS_MAIN;
1017                 } else {
1018                         # Namespace or interwiki prefix
1019                         if ( preg_match( "/^(.+?)_*:_*(.*)$/", $t, $m ) ) {
1020                                 #$p = strtolower( $m[1] );
1021                                 $p = $m[1];
1022                                 $lowerNs = strtolower( $p );
1023                                 if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1024                                         # Canonical namespace
1025                                         $t = $m[2];
1026                                         $this->mNamespace = $ns;
1027                                 } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1028                                         # Ordinary namespace
1029                                         $t = $m[2];
1030                                         $this->mNamespace = $ns;
1031                                 } elseif ( $this->getInterwikiLink( $p ) ) {
1032                                         # Interwiki link
1033                                         $t = $m[2];
1034                                         $this->mInterwiki = $p;
1035
1036                                         if ( !preg_match( "/^([A-Za-z0-9_\\x80-\\xff]+):(.*)$/", $t, $m ) ) {
1037                                                 $done = true;
1038                                         } elseif($this->mInterwiki != $wgLocalInterwiki) {
1039                                                 $done = true;
1040                                         }
1041                                 }
1042                         }
1043                         $r = $t;
1044                 }
1045
1046                 # Redundant interwiki prefix to the local wiki
1047                 if ( 0 == strcmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1048                         $this->mInterwiki = '';
1049                 }
1050                 # We already know that some pages won't be in the database!
1051                 #
1052                 if ( '' != $this->mInterwiki || -1 == $this->mNamespace ) {
1053                         $this->mArticleID = 0;
1054                 }
1055                 $f = strstr( $r, '#' );
1056                 if ( false !== $f ) {
1057                         $this->mFragment = substr( $f, 1 );
1058                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
1059                         # remove whitespace again: prevents "Foo_bar_#"
1060                         # becoming "Foo_bar_"
1061                         $r = preg_replace( '/_*$/', '', $r );
1062                 }
1063
1064                 # Reject illegal characters.
1065                 #
1066                 if( preg_match( $rxTc, $r ) ) {
1067                         wfProfileOut( $fname );
1068                         return false;
1069                 }
1070
1071                 # "." and ".." conflict with the directories of those namesa
1072                 if ( strpos( $r, '.' ) !== false &&
1073                      ( $r === '.' || $r === '..' ||
1074                        strpos( $r, './' ) === 0  ||
1075                        strpos( $r, '../' ) === 0 ||
1076                        strpos( $r, '/./' ) !== false ||
1077                        strpos( $r, '/../' ) !== false ) )
1078                 {
1079                         wfProfileOut( $fname );
1080                         return false;
1081                 }
1082
1083                 # We shouldn't need to query the DB for the size.
1084                 #$maxSize = $dbr->textFieldSize( 'cur', 'cur_title' );
1085                 if ( strlen( $r ) > 255 ) {
1086                         return false;
1087                 }
1088
1089                 # Initial capital letter
1090                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1091                         $t = $wgContLang->ucfirst( $r );
1092                 } else {
1093                         $t = $r;
1094                 }
1095
1096                 # Fill fields
1097                 $this->mDbkeyform = $t;
1098                 $this->mUrlform = wfUrlencode( $t );
1099
1100                 $this->mTextform = str_replace( '_', ' ', $t );
1101
1102                 wfProfileOut( $fname );
1103                 return true;
1104         }
1105
1106         /**
1107          * Get a Title object associated with the talk page of this article
1108          * @return Title the object for the talk page
1109          * @access public
1110          */
1111         function getTalkPage() {
1112                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1113         }
1114
1115         /**
1116          * Get a title object associated with the subject page of this
1117          * talk page
1118          *
1119          * @return Title the object for the subject page
1120          * @access public
1121          */
1122         function getSubjectPage() {
1123                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1124         }
1125
1126         /**
1127          * Get an array of Title objects linking to this Title
1128          * - Also stores the IDs in the link cache.
1129          *
1130          * @param string $options may be FOR UPDATE
1131          * @return array the Title objects linking here
1132          * @access public
1133          */
1134         function getLinksTo( $options = '' ) {
1135                 global $wgLinkCache;
1136                 $id = $this->getArticleID();
1137
1138                 if ( $options ) {
1139                         $db =& wfGetDB( DB_MASTER );
1140                 } else {
1141                         $db =& wfGetDB( DB_SLAVE );
1142                 }
1143                 $cur = $db->tableName( 'cur' );
1144                 $links = $db->tableName( 'links' );
1145
1146                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM $cur,$links WHERE l_from=cur_id AND l_to={$id} $options";
1147                 $res = $db->query( $sql, 'Title::getLinksTo' );
1148                 $retVal = array();
1149                 if ( $db->numRows( $res ) ) {
1150                         while ( $row = $db->fetchObject( $res ) ) {
1151                                 if ( $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title ) ) {
1152                                         $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
1153                                         $retVal[] = $titleObj;
1154                                 }
1155                         }
1156                 }
1157                 $db->freeResult( $res );
1158                 return $retVal;
1159         }
1160
1161         /**
1162          * Get an array of Title objects linking to this non-existent title.
1163          * - Also stores the IDs in the link cache.
1164          *
1165          * @param string $options may be FOR UPDATE
1166          * @return array the Title objects linking here
1167          * @access public
1168          */
1169         function getBrokenLinksTo( $options = '' ) {
1170                 global $wgLinkCache;
1171
1172                 if ( $options ) {
1173                         $db =& wfGetDB( DB_MASTER );
1174                 } else {
1175                         $db =& wfGetDB( DB_SLAVE );
1176                 }
1177                 $cur = $db->tableName( 'cur' );
1178                 $brokenlinks = $db->tableName( 'brokenlinks' );
1179                 $encTitle = $db->strencode( $this->getPrefixedDBkey() );
1180
1181                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM $brokenlinks,$cur " .
1182                   "WHERE bl_from=cur_id AND bl_to='$encTitle' $options";
1183                 $res = $db->query( $sql, "Title::getBrokenLinksTo" );
1184                 $retVal = array();
1185                 if ( $db->numRows( $res ) ) {
1186                         while ( $row = $db->fetchObject( $res ) ) {
1187                                 $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title );
1188                                 $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
1189                                 $retVal[] = $titleObj;
1190                         }
1191                 }
1192                 $db->freeResult( $res );
1193                 return $retVal;
1194         }
1195
1196         /**
1197          * Get a list of URLs to purge from the Squid cache when this
1198          * page changes
1199          *
1200          * @return array the URLs
1201          * @access public
1202          */
1203         function getSquidURLs() {
1204                 return array(
1205                         $this->getInternalURL(),
1206                         $this->getInternalURL( 'action=history' )
1207                 );
1208         }
1209
1210         /**
1211          * Move this page without authentication
1212          * @param Title &$nt the new page Title
1213          * @access public
1214          */
1215         function moveNoAuth( &$nt ) {
1216                 return $this->moveTo( $nt, false );
1217         }
1218
1219         /**
1220          * Move a title to a new location
1221          * @param Title &$nt the new title
1222          * @param bool $auth indicates whether $wgUser's permissions
1223          *      should be checked
1224          * @return mixed true on success, message name on failure
1225          * @access public
1226          */
1227         function moveTo( &$nt, $auth = true ) {
1228                 if( !$this or !$nt ) {
1229                         return 'badtitletext';
1230                 }
1231
1232                 $fname = 'Title::move';
1233                 $oldid = $this->getArticleID();
1234                 $newid = $nt->getArticleID();
1235
1236                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1237                         return 'articleexists';
1238                 }
1239                 if ( ( ! Namespace::isMovable( $this->getNamespace() ) ) ||
1240                          ( '' == $this->getDBkey() ) ||
1241                          ( '' != $this->getInterwiki() ) ||
1242                          ( !$oldid ) ||
1243                      ( ! Namespace::isMovable( $nt->getNamespace() ) ) ||
1244                          ( '' == $nt->getDBkey() ) ||
1245                          ( '' != $nt->getInterwiki() ) ) {
1246                         return 'badarticleerror';
1247                 }
1248
1249                 if ( $auth && ( !$this->userCanEdit() || !$nt->userCanEdit() ) ) {
1250                         return 'protectedpage';
1251                 }
1252
1253                 # The move is allowed only if (1) the target doesn't exist, or
1254                 # (2) the target is a redirect to the source, and has no history
1255                 # (so we can undo bad moves right after they're done).
1256
1257                 if ( 0 != $newid ) { # Target exists; check for validity
1258                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1259                                 return 'articleexists';
1260                         }
1261                         $this->moveOverExistingRedirect( $nt );
1262                 } else { # Target didn't exist, do normal move.
1263                         $this->moveToNewTitle( $nt, $newid );
1264                 }
1265
1266                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
1267
1268                 $dbw =& wfGetDB( DB_MASTER );
1269                 $sql = "UPDATE categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
1270                         " WHERE cl_from=" . $dbw->addQuotes( $this->getArticleID() ) .
1271                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
1272                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
1273
1274                 # Update watchlists
1275
1276                 $oldnamespace = $this->getNamespace() & ~1;
1277                 $newnamespace = $nt->getNamespace() & ~1;
1278                 $oldtitle = $this->getDBkey();
1279                 $newtitle = $nt->getDBkey();
1280
1281                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
1282                         WatchedItem::duplicateEntries( $this, $nt );
1283                 }
1284
1285                 # Update search engine
1286                 $u = new SearchUpdate( $oldid, $nt->getPrefixedDBkey() );
1287                 $u->doUpdate();
1288                 $u = new SearchUpdate( $newid, $this->getPrefixedDBkey(), '' );
1289                 $u->doUpdate();
1290
1291                 return true;
1292         }
1293
1294         /**
1295          * Move page to a title which is at present a redirect to the
1296          * source page
1297          *
1298          * @param Title &$nt the page to move to, which should currently
1299          *      be a redirect
1300          * @access private
1301          */
1302         /* private */ function moveOverExistingRedirect( &$nt ) {
1303                 global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
1304                 $fname = 'Title::moveOverExistingRedirect';
1305                 $comment = wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1306
1307                 $now = wfTimestampNow();
1308                 $won = wfInvertTimestamp( $now );
1309                 $newid = $nt->getArticleID();
1310                 $oldid = $this->getArticleID();
1311                 $dbw =& wfGetDB( DB_MASTER );
1312                 $links = $dbw->tableName( 'links' );
1313
1314                 # Change the name of the target page:
1315                 $dbw->updateArray( 'cur',
1316                         /* SET */ array(
1317                                 'cur_touched' => $dbw->timestamp($now),
1318                                 'cur_namespace' => $nt->getNamespace(),
1319                                 'cur_title' => $nt->getDBkey()
1320                         ),
1321                         /* WHERE */ array( 'cur_id' => $oldid ),
1322                         $fname
1323                 );
1324                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1325
1326                 # Repurpose the old redirect. We don't save it to history since
1327                 # by definition if we've got here it's rather uninteresting.
1328
1329                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1330                 $dbw->updateArray( 'cur',
1331                         /* SET */ array(
1332                                 'cur_touched' => $dbw->timestamp($now),
1333                                 'cur_timestamp' => $dbw->timestamp($now),
1334                                 'inverse_timestamp' => $won,
1335                                 'cur_namespace' => $this->getNamespace(),
1336                                 'cur_title' => $this->getDBkey(),
1337                                 'cur_text' => $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n",
1338                                 'cur_comment' => $comment,
1339                                 'cur_user' => $wgUser->getID(),
1340                                 'cur_minor_edit' => 0,
1341                                 'cur_counter' => 0,
1342                                 'cur_restrictions' => '',
1343                                 'cur_user_text' => $wgUser->getName(),
1344                                 'cur_is_redirect' => 1,
1345                                 'cur_is_new' => 1
1346                         ),
1347                         /* WHERE */ array( 'cur_id' => $newid ),
1348                         $fname
1349                 );
1350
1351                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1352
1353                 # Fix the redundant names for the past revisions of the target page.
1354                 # The redirect should have no old revisions.
1355                 $dbw->updateArray(
1356                         /* table */ 'old',
1357                         /* SET */ array(
1358                                 'old_namespace' => $nt->getNamespace(),
1359                                 'old_title' => $nt->getDBkey(),
1360                         ),
1361                         /* WHERE */ array(
1362                                 'old_namespace' => $this->getNamespace(),
1363                                 'old_title' => $this->getDBkey(),
1364                         ),
1365                         $fname
1366                 );
1367
1368                 RecentChange::notifyMoveOverRedirect( $now, $this, $nt, $wgUser, $comment );
1369
1370                 # Swap links
1371
1372                 # Load titles and IDs
1373                 $linksToOld = $this->getLinksTo( 'FOR UPDATE' );
1374                 $linksToNew = $nt->getLinksTo( 'FOR UPDATE' );
1375
1376                 # Delete them all
1377                 $sql = "DELETE FROM $links WHERE l_to=$oldid OR l_to=$newid";
1378                 $dbw->query( $sql, $fname );
1379
1380                 # Reinsert
1381                 if ( count( $linksToOld ) || count( $linksToNew )) {
1382                         $sql = "INSERT INTO $links (l_from,l_to) VALUES ";
1383                         $first = true;
1384
1385                         # Insert links to old title
1386                         foreach ( $linksToOld as $linkTitle ) {
1387                                 if ( $first ) {
1388                                         $first = false;
1389                                 } else {
1390                                         $sql .= ',';
1391                                 }
1392                                 $id = $linkTitle->getArticleID();
1393                                 $sql .= "($id,$newid)";
1394                         }
1395
1396                         # Insert links to new title
1397                         foreach ( $linksToNew as $linkTitle ) {
1398                                 if ( $first ) {
1399                                         $first = false;
1400                                 } else {
1401                                         $sql .= ',';
1402                                 }
1403                                 $id = $linkTitle->getArticleID();
1404                                 $sql .= "($id, $oldid)";
1405                         }
1406
1407                         $dbw->query( $sql, DB_MASTER, $fname );
1408                 }
1409
1410                 # Now, we record the link from the redirect to the new title.
1411                 # It should have no other outgoing links...
1412                 $dbw->delete( 'links', array( 'l_from' => $newid ) );
1413                 $dbw->insertArray( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ) );
1414
1415                 # Clear linkscc
1416                 LinkCache::linksccClearLinksTo( $oldid );
1417                 LinkCache::linksccClearLinksTo( $newid );
1418
1419                 # Purge squid
1420                 if ( $wgUseSquid ) {
1421                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1422                         $u = new SquidUpdate( $urls );
1423                         $u->doUpdate();
1424                 }
1425         }
1426
1427         /**
1428          * Move page to non-existing title.
1429          * @param Title &$nt the new Title
1430          * @param int &$newid set to be the new article ID
1431          * @access private
1432          */
1433         /* private */ function moveToNewTitle( &$nt, &$newid ) {
1434                 global $wgUser, $wgLinkCache, $wgUseSquid;
1435                 $fname = 'MovePageForm::moveToNewTitle';
1436                 $comment = wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1437
1438                 $newid = $nt->getArticleID();
1439                 $oldid = $this->getArticleID();
1440                 $dbw =& wfGetDB( DB_MASTER );
1441                 $now = $dbw->timestamp();
1442                 $won = wfInvertTimestamp( wfTimestamp(TS_MW,$now) );
1443                 wfSeedRandom();
1444                 $rand = number_format( mt_rand() / mt_getrandmax(), 12, '.', '' );
1445
1446                 # Rename cur entry
1447                 $dbw->updateArray( 'cur',
1448                         /* SET */ array(
1449                                 'cur_touched' => $now,
1450                                 'cur_namespace' => $nt->getNamespace(),
1451                                 'cur_title' => $nt->getDBkey()
1452                         ),
1453                         /* WHERE */ array( 'cur_id' => $oldid ),
1454                         $fname
1455                 );
1456
1457                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1458
1459                 # Insert redirect
1460                 $dbw->insertArray( 'cur', array(
1461                         'cur_id' => $dbw->nextSequenceValue('cur_cur_id_seq'),
1462                         'cur_namespace' => $this->getNamespace(),
1463                         'cur_title' => $this->getDBkey(),
1464                         'cur_comment' => $comment,
1465                         'cur_user' => $wgUser->getID(),
1466                         'cur_user_text' => $wgUser->getName(),
1467                         'cur_timestamp' => $now,
1468                         'inverse_timestamp' => $won,
1469                         'cur_touched' => $now,
1470                         'cur_is_redirect' => 1,
1471                         'cur_random' => $rand,
1472                         'cur_is_new' => 1,
1473                         'cur_text' => "#REDIRECT [[" . $nt->getPrefixedText() . "]]\n" ), $fname
1474                 );
1475                 $newid = $dbw->insertId();
1476                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1477
1478                 # Rename old entries
1479                 $dbw->updateArray(
1480                         /* table */ 'old',
1481                         /* SET */ array(
1482                                 'old_namespace' => $nt->getNamespace(),
1483                                 'old_title' => $nt->getDBkey()
1484                         ),
1485                         /* WHERE */ array(
1486                                 'old_namespace' => $this->getNamespace(),
1487                                 'old_title' => $this->getDBkey()
1488                         ), $fname
1489                 );
1490
1491                 # Record in RC
1492                 RecentChange::notifyMoveToNew( $now, $this, $nt, $wgUser, $comment );
1493
1494                 # Purge squid and linkscc as per article creation
1495                 Article::onArticleCreate( $nt );
1496
1497                 # Any text links to the old title must be reassigned to the redirect
1498                 $dbw->updateArray( 'links', array( 'l_to' => $newid ), array( 'l_to' => $oldid ), $fname );
1499                 LinkCache::linksccClearLinksTo( $oldid );
1500
1501                 # Record the just-created redirect's linking to the page
1502                 $dbw->insertArray( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ), $fname );
1503
1504                 # Non-existent target may have had broken links to it; these must
1505                 # now be removed and made into good links.
1506                 $update = new LinksUpdate( $oldid, $nt->getPrefixedDBkey() );
1507                 $update->fixBrokenLinks();
1508
1509                 # Purge old title from squid
1510                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1511                 $titles = $nt->getLinksTo();
1512                 if ( $wgUseSquid ) {
1513                         $urls = $this->getSquidURLs();
1514                         foreach ( $titles as $linkTitle ) {
1515                                 $urls[] = $linkTitle->getInternalURL();
1516                         }
1517                         $u = new SquidUpdate( $urls );
1518                         $u->doUpdate();
1519                 }
1520         }
1521
1522         /**
1523          * Checks if $this can be moved to a given Title
1524          * - Selects for update, so don't call it unless you mean business
1525          *
1526          * @param Title &$nt the new title to check
1527          * @access public
1528          */
1529         function isValidMoveTarget( $nt ) {
1530                 $fname = 'Title::isValidMoveTarget';
1531                 $dbw =& wfGetDB( DB_MASTER );
1532
1533                 # Is it a redirect?
1534                 $id  = $nt->getArticleID();
1535                 $obj = $dbw->getArray( 'cur', array( 'cur_is_redirect','cur_text' ),
1536                         array( 'cur_id' => $id ), $fname, 'FOR UPDATE' );
1537
1538                 if ( !$obj || 0 == $obj->cur_is_redirect ) {
1539                         # Not a redirect
1540                         return false;
1541                 }
1542
1543                 # Does the redirect point to the source?
1544                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $obj->cur_text, $m ) ) {
1545                         $redirTitle = Title::newFromText( $m[1] );
1546                         if( !is_object( $redirTitle ) ||
1547                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1548                                 return false;
1549                         }
1550                 }
1551
1552                 # Does the article have a history?
1553                 $row = $dbw->getArray( 'old', array( 'old_id' ),
1554                         array(
1555                                 'old_namespace' => $nt->getNamespace(),
1556                                 'old_title' => $nt->getDBkey()
1557                         ), $fname, 'FOR UPDATE'
1558                 );
1559
1560                 # Return true if there was no history
1561                 return $row === false;
1562         }
1563
1564         /**
1565          * Create a redirect; fails if the title already exists; does
1566          * not notify RC
1567          *
1568          * @param Title $dest the destination of the redirect
1569          * @param string $comment the comment string describing the move
1570          * @return bool true on success
1571          * @access public
1572          */
1573         function createRedirect( $dest, $comment ) {
1574                 global $wgUser;
1575                 if ( $this->getArticleID() ) {
1576                         return false;
1577                 }
1578
1579                 $fname = 'Title::createRedirect';
1580                 $dbw =& wfGetDB( DB_MASTER );
1581                 $now = wfTimestampNow();
1582                 $won = wfInvertTimestamp( $now );
1583                 $seqVal = $dbw->nextSequenceValue( 'cur_cur_id_seq' );
1584
1585                 $dbw->insertArray( 'cur', array(
1586                         'cur_id' => $seqVal,
1587                         'cur_namespace' => $this->getNamespace(),
1588                         'cur_title' => $this->getDBkey(),
1589                         'cur_comment' => $comment,
1590                         'cur_user' => $wgUser->getID(),
1591                         'cur_user_text' => $wgUser->getName(),
1592                         'cur_timestamp' => $now,
1593                         'inverse_timestamp' => $won,
1594                         'cur_touched' => $now,
1595                         'cur_is_redirect' => 1,
1596                         'cur_is_new' => 1,
1597                         'cur_text' => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n"
1598                 ), $fname );
1599                 $newid = $dbw->insertId();
1600                 $this->resetArticleID( $newid );
1601
1602                 # Link table
1603                 if ( $dest->getArticleID() ) {
1604                         $dbw->insertArray( 'links',
1605                                 array(
1606                                         'l_to' => $dest->getArticleID(),
1607                                         'l_from' => $newid
1608                                 ), $fname
1609                         );
1610                 } else {
1611                         $dbw->insertArray( 'brokenlinks',
1612                                 array(
1613                                         'bl_to' => $dest->getPrefixedDBkey(),
1614                                         'bl_from' => $newid
1615                                 ), $fname
1616                         );
1617                 }
1618
1619                 Article::onArticleCreate( $this );
1620                 return true;
1621         }
1622
1623         /**
1624          * Get categories to which this Title belongs and return an array of
1625          * categories' names.
1626          *
1627          * @return array an array of parents in the form:
1628          *      $parent => $currentarticle
1629          * @access public
1630          */
1631         function getParentCategories() {
1632                 global $wgContLang,$wgUser;
1633
1634                 $titlekey = $this->getArticleId();
1635                 $sk =& $wgUser->getSkin();
1636                 $parents = array();
1637                 $dbr =& wfGetDB( DB_SLAVE );
1638                 $cur = $dbr->tableName( 'cur' );
1639                 $categorylinks = $dbr->tableName( 'categorylinks' );
1640
1641                 # NEW SQL
1642                 $sql = "SELECT * FROM categorylinks"
1643                      ." WHERE cl_from='$titlekey'"
1644                          ." AND cl_from <> '0'"
1645                          ." ORDER BY cl_sortkey";
1646
1647                 $res = $dbr->query ( $sql ) ;
1648
1649                 if($dbr->numRows($res) > 0) {
1650                         while ( $x = $dbr->fetchObject ( $res ) )
1651                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
1652                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
1653                         $dbr->freeResult ( $res ) ;
1654                 } else {
1655                         $data = '';
1656                 }
1657                 return $data;
1658         }
1659
1660         /**
1661          * Go through all parent categories of this Title
1662          * @return array
1663          * @access public
1664          */
1665         function getCategorieBrowser() {
1666                 $parents = $this->getParentCategories();
1667
1668                 if($parents != '') {
1669                         foreach($parents as $parent => $current)
1670                         {
1671                                 $nt = Title::newFromText($parent);
1672                                 $stack[$parent] = $nt->getCategorieBrowser();
1673                         }
1674                         return $stack;
1675                 } else {
1676                         return array();
1677                 }
1678         }
1679
1680
1681         /**
1682          * Get an associative array for selecting this title from
1683          * the "cur" table
1684          *
1685          * @return array
1686          * @access public
1687          */
1688         function curCond() {
1689                 return array( 'cur_namespace' => $this->mNamespace, 'cur_title' => $this->mDbkeyform );
1690         }
1691
1692         /**
1693          * Get an associative array for selecting this title from the
1694          * "old" table
1695          *
1696          * @return array
1697          * @access public
1698          */
1699         function oldCond() {
1700                 return array( 'old_namespace' => $this->mNamespace, 'old_title' => $this->mDbkeyform );
1701         }
1702
1703         /**
1704          * Get the revision ID of the previous revision
1705          *
1706          * @param integer $revision  Revision ID. Get the revision that was before this one.
1707          * @return interger $oldrevision|false
1708          */
1709         function getPreviousRevisionID( $revision ) {
1710                 $dbr =& wfGetDB( DB_SLAVE );
1711                 return $dbr->selectField( 'old', 'old_id',
1712                         'old_title=' . $dbr->addQuotes( $this->getDBkey() ) .
1713                         ' AND old_namespace=' . IntVal( $this->getNamespace() ) .
1714                         ' AND old_id<' . IntVal( $revision ) . ' ORDER BY old_id DESC' );
1715         }
1716
1717         /**
1718          * Get the revision ID of the next revision
1719          *
1720          * @param integer $revision  Revision ID. Get the revision that was after this one.
1721          * @return interger $oldrevision|false
1722          */
1723         function getNextRevisionID( $revision ) {
1724                 $dbr =& wfGetDB( DB_SLAVE );
1725                 return $dbr->selectField( 'old', 'old_id',
1726                         'old_title=' . $dbr->addQuotes( $this->getDBkey() ) .
1727                         ' AND old_namespace=' . IntVal( $this->getNamespace() ) .
1728                         ' AND old_id>' . IntVal( $revision ) . ' ORDER BY old_id' );
1729         }
1730
1731 }
1732 ?>