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                 //convert to the desired language variant
 529                 $t = $wgContLang->convert($this->mPrefixedText);
 530                 return $t;
 531         }
 532
 533         /**
 534          * Get the prefixed title with spaces, plus any fragment
 535          * (part beginning with '#')
 536          * @return string the prefixed title, with spaces and
 537          *      the fragment, including '#'
 538          * @access public
 539          */
 540         function getFullText() {
 541                 global $wgContLang;
 542                 $text = $this->getPrefixedText();
 543                 if( '' != $this->mFragment ) {
 544                         $text .= '#' . $this->mFragment;
 545                 }
 546                 //convert to desired language variant
 547                 $t = $wgContLang->convert($text);
 548                 return $t;
 549         }
 550
 551         /**
 552          * Get a URL-encoded title (not an actual URL) including interwiki
 553          * @return string the URL-encoded form
 554          * @access public
 555          */
 556         function getPrefixedURL() {
 557                 $s = $this->prefix( $this->mDbkeyform );
 558                 $s = str_replace( ' ', '_', $s );
 559
 560                 $s = wfUrlencode ( $s ) ;
 561
 562                 # Cleaning up URL to make it look nice -- is this safe?
 563                 $s = preg_replace( '/%3[Aa]/', ':', $s );
 564                 $s = preg_replace( '/%2[Ff]/', '/', $s );
 565                 $s = str_replace( '%28', '(', $s );
 566                 $s = str_replace( '%29', ')', $s );
 567
 568                 return $s;
 569         }
 570
 571         /**
 572          * Get a real URL referring to this title, with interwiki link and
 573          * fragment
 574          *
 575          * @param string $query an optional query string, not used
 576          *      for interwiki links
 577          * @return string the URL
 578          * @access public
 579          */
 580         function getFullURL( $query = '' ) {
 581                 global $wgContLang, $wgArticlePath, $wgServer, $wgScript;
 582
 583                 if ( '' == $this->mInterwiki ) {
 584                         $p = $wgArticlePath;
 585                         return $wgServer . $this->getLocalUrl( $query );
 586                 } else {
 587                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 588                         $namespace = $wgContLang->getNsText( $this->mNamespace );
 589                         if ( '' != $namespace ) {
 590                                 # Can this actually happen? Interwikis shouldn't be parsed.
 591                                 $namepace .= ':';
 592                         }
 593                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 594                         if ( '' != $this->mFragment ) {
 595                                 $url .= '#' . $this->mFragment;
 596                         }
 597                         return $url;
 598                 }
 599         }
 600
 601         /**
 602          * @deprecated
 603          */
 604         function getURL() {
 605                 die( 'Call to obsolete obsolete function Title::getURL()' );
 606         }
 607
 608         /**
 609          * Get a URL with no fragment or server name
 610          * @param string $query an optional query string; if not specified,
 611          *      $wgArticlePath will be used.
 612          * @return string the URL
 613          * @access public
 614          */
 615         function getLocalURL( $query = '' ) {
 616                 global $wgLang, $wgArticlePath, $wgScript;
 617
 618                 if ( $this->isExternal() ) {
 619                         return $this->getFullURL();
 620                 }
 621
 622                 $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 623                 if ( $query == '' ) {
 624                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 625                 } else {
 626                         if ( $query == '-' ) {
 627                                 $query = '';
 628                         }
 629                         if ( $wgScript != '' ) {
 630                                 $url = "{$wgScript}?title={$dbkey}&{$query}";
 631                         } else {
 632                                 # Top level wiki
 633                                 $url = "/{$dbkey}?{$query}";
 634                         }
 635                 }
 636                 return $url;
 637         }
 638
 639         /**
 640          * Get an HTML-escaped version of the URL form, suitable for
 641          * using in a link, without a server name or fragment
 642          * @param string $query an optional query string
 643          * @return string the URL
 644          * @access public
 645          */
 646         function escapeLocalURL( $query = '' ) {
 647                 return htmlspecialchars( $this->getLocalURL( $query ) );
 648         }
 649
 650         /**
 651          * Get an HTML-escaped version of the URL form, suitable for
 652          * using in a link, including the server name and fragment
 653          *
 654          * @return string the URL
 655          * @param string $query an optional query string
 656          * @access public
 657          */
 658         function escapeFullURL( $query = '' ) {
 659                 return htmlspecialchars( $this->getFullURL( $query ) );
 660         }
 661
 662         /**
 663          * Get the URL form for an internal link.
 664          * - Used in various Squid-related code, in case we have a different
 665          * internal hostname for the server from the exposed one.
 666          *
 667          * @param string $query an optional query string
 668          * @return string the URL
 669          * @access public
 670          */
 671         function getInternalURL( $query = '' ) {
 672                 global $wgInternalServer;
 673                 return $wgInternalServer . $this->getLocalURL( $query );
 674         }
 675
 676         /**
 677          * Get the edit URL for this Title
 678          * @return string the URL, or a null string if this is an
 679          *      interwiki link
 680          * @access public
 681          */
 682         function getEditURL() {
 683                 global $wgServer, $wgScript;
 684
 685                 if ( '' != $this->mInterwiki ) { return ''; }
 686                 $s = $this->getLocalURL( 'action=edit' );
 687
 688                 return $s;
 689         }
 690
 691         /**
 692          * Get the HTML-escaped displayable text form.
 693          * Used for the title field in <a> tags.
 694          * @return string the text, including any prefixes
 695          * @access public
 696          */
 697         function getEscapedText() {
 698                 return htmlspecialchars( $this->getPrefixedText() );
 699         }
 700
 701         /**
 702          * Is this Title interwiki?
 703          * @return boolean
 704          * @access public
 705          */
 706         function isExternal() { return ( '' != $this->mInterwiki ); }
 707
 708         /**
 709          * Does the title correspond to a protected article?
 710          * @return boolean
 711          * @access public
 712          */
 713         function isProtected() {
 714                 if ( -1 == $this->mNamespace ) { return true; }
 715                 $a = $this->getRestrictions();
 716                 if ( in_array( 'sysop', $a ) ) { return true; }
 717                 return false;
 718         }
 719
 720         /**
 721          * Is the page a log page, i.e. one where the history is messed up by
 722          * LogPage.php? This used to be used for suppressing diff links in
 723          * recent changes, but now that's done by setting a flag in the
 724          * recentchanges table. Hence, this probably is no longer used.
 725          *
 726          * @deprecated
 727          * @access public
 728          */
 729         function isLog() {
 730                 if ( $this->mNamespace != Namespace::getWikipedia() ) {
 731                         return false;
 732                 }
 733                 if ( ( 0 == strcmp( wfMsg( 'uploadlogpage' ), $this->mDbkeyform ) ) ||
 734                   ( 0 == strcmp( wfMsg( 'dellogpage' ), $this->mDbkeyform ) ) ) {
 735                         return true;
 736                 }
 737                 return false;
 738         }
 739
 740         /**
 741          * Is $wgUser is watching this page?
 742          * @return boolean
 743          * @access public
 744          */
 745         function userIsWatching() {
 746                 global $wgUser;
 747
 748                 if ( -1 == $this->mNamespace ) { return false; }
 749                 if ( 0 == $wgUser->getID() ) { return false; }
 750
 751                 return $wgUser->isWatched( $this );
 752         }
 753
 754         /**
 755          * Can $wgUser edit this page?
 756          * @return boolean
 757          * @access public
 758          */
 759         function userCanEdit() {
 760                 global $wgUser;
 761                 if ( -1 == $this->mNamespace ) { return false; }
 762                 if ( NS_MEDIAWIKI == $this->mNamespace && !$wgUser->isSysop() ) { return false; }
 763                 # if ( 0 == $this->getArticleID() ) { return false; }
 764                 if ( $this->mDbkeyform == '_' ) { return false; }
 765                 # protect global styles and js
 766                 if ( NS_MEDIAWIKI == $this->mNamespace
 767                      && preg_match("/\\.(css|js)$/", $this->mTextform )
 768                      && !$wgUser->isSysop() )
 769                 { return false; }
 770                 //if ( $this->isCssJsSubpage() and !$this->userCanEditCssJsSubpage() ) { return false; }
 771                 # protect css/js subpages of user pages
 772                 # XXX: this might be better using restrictions
 773                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
 774                 if( Namespace::getUser() == $this->mNamespace
 775                         and preg_match("/\\.(css|js)$/", $this->mTextform )
 776                         and !$wgUser->isSysop()
 777                         and !preg_match('/^'.preg_quote($wgUser->getName(), '/').'/', $this->mTextform) )
 778                 { return false; }
 779                 $ur = $wgUser->getRights();
 780                 foreach ( $this->getRestrictions() as $r ) {
 781                         if ( '' != $r && ( ! in_array( $r, $ur ) ) ) {
 782                                 return false;
 783                         }
 784                 }
 785                 return true;
 786         }
 787
 788         /**
 789          * Can $wgUser read this page?
 790          * @return boolean
 791          * @access public
 792          */
 793         function userCanRead() {
 794                 global $wgUser;
 795                 global $wgWhitelistRead;
 796
 797                 if( 0 != $wgUser->getID() ) return true;
 798                 if( !is_array( $wgWhitelistRead ) ) return true;
 799
 800                 $name = $this->getPrefixedText();
 801                 if( in_array( $name, $wgWhitelistRead ) ) return true;
 802
 803                 # Compatibility with old settings
 804                 if( $this->getNamespace() == NS_MAIN ) {
 805                         if( in_array( ':' . $name, $wgWhitelistRead ) ) return true;
 806                 }
 807                 return false;
 808         }
 809
 810         /**
 811          * Is this a .css or .js subpage of a user page?
 812          * @return bool
 813          * @access public
 814          */
 815         function isCssJsSubpage() {
 816                 return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
 817         }
 818         /**
 819          * Is this a .css subpage of a user page?
 820          * @return bool
 821          * @access public
 822          */
 823         function isCssSubpage() {
 824                 return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
 825         }
 826         /**
 827          * Is this a .js subpage of a user page?
 828          * @return bool
 829          * @access public
 830          */
 831         function isJsSubpage() {
 832                 return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
 833         }
 834         /**
 835          * Protect css/js subpages of user pages: can $wgUser edit
 836          * this page?
 837          *
 838          * @return boolean
 839          * @todo XXX: this might be better using restrictions
 840          * @access public
 841          */
 842         function userCanEditCssJsSubpage() {
 843                 global $wgUser;
 844                 return ( $wgUser->isSysop() or preg_match('/^'.preg_quote($wgUser->getName()).'/', $this->mTextform) );
 845         }
 846
 847         /**
 848          * Accessor/initialisation for mRestrictions
 849          * @return array the array of groups allowed to edit this article
 850          * @access public
 851          */
 852         function getRestrictions() {
 853                 $id = $this->getArticleID();
 854                 if ( 0 == $id ) { return array(); }
 855
 856                 if ( ! $this->mRestrictionsLoaded ) {
 857                         $dbr =& wfGetDB( DB_SLAVE );
 858                         $res = $dbr->getField( 'cur', 'cur_restrictions', 'cur_id='.$id );
 859                         $this->mRestrictions = explode( ',', trim( $res ) );
 860                         $this->mRestrictionsLoaded = true;
 861                 }
 862                 return $this->mRestrictions;
 863         }
 864
 865         /**
 866          * Is there a version of this page in the deletion archive?
 867          * @return int the number of archived revisions
 868          * @access public
 869          */
 870         function isDeleted() {
 871                 $fname = 'Title::isDeleted';
 872                 $dbr =& wfGetDB( DB_SLAVE );
 873                 $n = $dbr->getField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
 874                         'ar_title' => $this->getDBkey() ), $fname );
 875                 return (int)$n;
 876         }
 877
 878         /**
 879          * Get the article ID for this Title from the link cache,
 880          * adding it if necessary
 881          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
 882          *      for update
 883          * @return int the ID
 884          * @access public
 885          */
 886         function getArticleID( $flags = 0 ) {
 887                 global $wgLinkCache;
 888
 889                 if ( $flags & GAID_FOR_UPDATE ) {
 890                         $oldUpdate = $wgLinkCache->forUpdate( true );
 891                         $this->mArticleID = $wgLinkCache->addLinkObj( $this );
 892                         $wgLinkCache->forUpdate( $oldUpdate );
 893                 } else {
 894                         if ( -1 == $this->mArticleID ) {
 895                                 $this->mArticleID = $wgLinkCache->addLinkObj( $this );
 896                         }
 897                 }
 898                 return $this->mArticleID;
 899         }
 900
 901         /**
 902          * This clears some fields in this object, and clears any associated
 903          * keys in the "bad links" section of $wgLinkCache.
 904          *
 905          * - This is called from Article::insertNewArticle() to allow
 906          * loading of the new cur_id. It's also called from
 907          * Article::doDeleteArticle()
 908          *
 909          * @param int $newid the new Article ID
 910          * @access public
 911          */
 912         function resetArticleID( $newid ) {
 913                 global $wgLinkCache;
 914                 $wgLinkCache->clearBadLink( $this->getPrefixedDBkey() );
 915
 916                 if ( 0 == $newid ) { $this->mArticleID = -1; }
 917                 else { $this->mArticleID = $newid; }
 918                 $this->mRestrictionsLoaded = false;
 919                 $this->mRestrictions = array();
 920         }
 921
 922         /**
 923          * Updates cur_touched for this page; called from LinksUpdate.php
 924          * @return bool true if the update succeded
 925          * @access public
 926          */
 927         function invalidateCache() {
 928                 $now = wfTimestampNow();
 929                 $dbw =& wfGetDB( DB_MASTER );
 930                 $success = $dbw->updateArray( 'cur',
 931                         array( /* SET */
 932                                 'cur_touched' => $dbw->timestamp()
 933                         ), array( /* WHERE */
 934                                 'cur_namespace' => $this->getNamespace() ,
 935                                 'cur_title' => $this->getDBkey()
 936                         ), 'Title::invalidateCache'
 937                 );
 938                 return $success;
 939         }
 940
 941         /**
 942          * Prefix some arbitrary text with the namespace or interwiki prefix
 943          * of this object
 944          *
 945          * @param string $name the text
 946          * @return string the prefixed text
 947          * @access private
 948          */
 949         /* private */ function prefix( $name ) {
 950                 global $wgContLang;
 951
 952                 $p = '';
 953                 if ( '' != $this->mInterwiki ) {
 954                         $p = $this->mInterwiki . ':';
 955                 }
 956                 if ( 0 != $this->mNamespace ) {
 957                         $p .= $wgContLang->getNsText( $this->mNamespace ) . ':';
 958                 }
 959                 return $p . $name;
 960         }
 961
 962         /**
 963          * Secure and split - main initialisation function for this object
 964          *
 965          * Assumes that mDbkeyform has been set, and is urldecoded
 966          * and uses underscores, but not otherwise munged.  This function
 967          * removes illegal characters, splits off the interwiki and
 968          * namespace prefixes, sets the other forms, and canonicalizes
 969          * everything.
 970          * @return bool true on success
 971          * @access private
 972          */
 973         /* private */ function secureAndSplit()
 974         {
 975                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
 976                 $fname = 'Title::secureAndSplit';
 977                 wfProfileIn( $fname );
 978
 979                 static $imgpre = false;
 980                 static $rxTc = false;
 981
 982                 # Initialisation
 983                 if ( $imgpre === false ) {
 984                         $imgpre = ':' . $wgContLang->getNsText( Namespace::getImage() ) . ':';
 985                         # % is needed as well
 986                         $rxTc = '/[^' . Title::legalChars() . ']/';
 987                 }
 988
 989                 $this->mInterwiki = $this->mFragment = '';
 990                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
 991
 992                 # Clean up whitespace
 993                 #
 994                 $t = preg_replace( "/[\\s_]+/", '_', $this->mDbkeyform );
 995                 $t = preg_replace( '/^_*(.*?)_*$/', '$1', $t );
 996
 997                 if ( '' == $t ) {
 998                         wfProfileOut( $fname );
 999                         return false;
1000                 }
1001
1002                 global $wgUseLatin1;
1003                 if( !$wgUseLatin1 &&  false !== strpos( $t, UTF8_REPLACEMENT ) ) {
1004                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1005                         wfProfileOut( $fname );
1006                         return false;
1007                 }
1008
1009                 $this->mDbkeyform = $t;
1010                 $done = false;
1011
1012                 # :Image: namespace
1013                 if ( 0 == strncasecmp( $imgpre, $t, strlen( $imgpre ) ) ) {
1014                         $t = substr( $t, 1 );
1015                 }
1016
1017                 # Initial colon indicating main namespace
1018                 if ( ':' == $t{0} ) {
1019                         $r = substr( $t, 1 );
1020                         $this->mNamespace = NS_MAIN;
1021                 } else {
1022                         # Namespace or interwiki prefix
1023                         if ( preg_match( "/^(.+?)_*:_*(.*)$/", $t, $m ) ) {
1024                                 #$p = strtolower( $m[1] );
1025                                 $p = $m[1];
1026                                 $lowerNs = strtolower( $p );
1027                                 if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1028                                         # Canonical namespace
1029                                         $t = $m[2];
1030                                         $this->mNamespace = $ns;
1031                                 } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1032                                         # Ordinary namespace
1033                                         $t = $m[2];
1034                                         $this->mNamespace = $ns;
1035                                 } elseif ( $this->getInterwikiLink( $p ) ) {
1036                                         # Interwiki link
1037                                         $t = $m[2];
1038                                         $this->mInterwiki = $p;
1039
1040                                         if ( !preg_match( "/^([A-Za-z0-9_\\x80-\\xff]+):(.*)$/", $t, $m ) ) {
1041                                                 $done = true;
1042                                         } elseif($this->mInterwiki != $wgLocalInterwiki) {
1043                                                 $done = true;
1044                                         }
1045                                 }
1046                         }
1047                         $r = $t;
1048                 }
1049
1050                 # Redundant interwiki prefix to the local wiki
1051                 if ( 0 == strcmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1052                         $this->mInterwiki = '';
1053                 }
1054                 # We already know that some pages won't be in the database!
1055                 #
1056                 if ( '' != $this->mInterwiki || -1 == $this->mNamespace ) {
1057                         $this->mArticleID = 0;
1058                 }
1059                 $f = strstr( $r, '#' );
1060                 if ( false !== $f ) {
1061                         $this->mFragment = substr( $f, 1 );
1062                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
1063                         # remove whitespace again: prevents "Foo_bar_#"
1064                         # becoming "Foo_bar_"
1065                         $r = preg_replace( '/_*$/', '', $r );
1066                 }
1067
1068                 # Reject illegal characters.
1069                 #
1070                 if( preg_match( $rxTc, $r ) ) {
1071                         wfProfileOut( $fname );
1072                         return false;
1073                 }
1074
1075                 # "." and ".." conflict with the directories of those namesa
1076                 if ( strpos( $r, '.' ) !== false &&
1077                      ( $r === '.' || $r === '..' ||
1078                        strpos( $r, './' ) === 0  ||
1079                        strpos( $r, '../' ) === 0 ||
1080                        strpos( $r, '/./' ) !== false ||
1081                        strpos( $r, '/../' ) !== false ) )
1082                 {
1083                         wfProfileOut( $fname );
1084                         return false;
1085                 }
1086
1087                 # We shouldn't need to query the DB for the size.
1088                 #$maxSize = $dbr->textFieldSize( 'cur', 'cur_title' );
1089                 if ( strlen( $t ) > 255 ) {
1090                         return false;
1091                 }
1092
1093                 # Initial capital letter
1094                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1095                         $t = $wgContLang->ucfirst( $r );
1096                 } else {
1097                         $t = $r;
1098                 }
1099
1100                 # Fill fields
1101                 $this->mDbkeyform = $t;
1102                 $this->mUrlform = wfUrlencode( $t );
1103
1104                 $this->mTextform = str_replace( '_', ' ', $t );
1105
1106                 wfProfileOut( $fname );
1107                 return true;
1108         }
1109
1110         /**
1111          * Get a Title object associated with the talk page of this article
1112          * @return Title the object for the talk page
1113          * @access public
1114          */
1115         function getTalkPage() {
1116                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1117         }
1118
1119         /**
1120          * Get a title object associated with the subject page of this
1121          * talk page
1122          *
1123          * @return Title the object for the subject page
1124          * @access public
1125          */
1126         function getSubjectPage() {
1127                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1128         }
1129
1130         /**
1131          * Get an array of Title objects linking to this Title
1132          * - Also stores the IDs in the link cache.
1133          *
1134          * @param string $options may be FOR UPDATE
1135          * @return array the Title objects linking here
1136          * @access public
1137          */
1138         function getLinksTo( $options = '' ) {
1139                 global $wgLinkCache;
1140                 $id = $this->getArticleID();
1141
1142                 if ( $options ) {
1143                         $db =& wfGetDB( DB_MASTER );
1144                 } else {
1145                         $db =& wfGetDB( DB_SLAVE );
1146                 }
1147                 $cur = $db->tableName( 'cur' );
1148                 $links = $db->tableName( 'links' );
1149
1150                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM $cur,$links WHERE l_from=cur_id AND l_to={$id} $options";
1151                 $res = $db->query( $sql, 'Title::getLinksTo' );
1152                 $retVal = array();
1153                 if ( $db->numRows( $res ) ) {
1154                         while ( $row = $db->fetchObject( $res ) ) {
1155                                 if ( $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title ) ) {
1156                                         $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
1157                                         $retVal[] = $titleObj;
1158                                 }
1159                         }
1160                 }
1161                 $db->freeResult( $res );
1162                 return $retVal;
1163         }
1164
1165         /**
1166          * Get an array of Title objects linking to this non-existent title.
1167          * - Also stores the IDs in the link cache.
1168          *
1169          * @param string $options may be FOR UPDATE
1170          * @return array the Title objects linking here
1171          * @access public
1172          */
1173         function getBrokenLinksTo( $options = '' ) {
1174                 global $wgLinkCache;
1175
1176                 if ( $options ) {
1177                         $db =& wfGetDB( DB_MASTER );
1178                 } else {
1179                         $db =& wfGetDB( DB_SLAVE );
1180                 }
1181                 $cur = $db->tableName( 'cur' );
1182                 $brokenlinks = $db->tableName( 'brokenlinks' );
1183                 $encTitle = $db->strencode( $this->getPrefixedDBkey() );
1184
1185                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM $brokenlinks,$cur " .
1186                   "WHERE bl_from=cur_id AND bl_to='$encTitle' $options";
1187                 $res = $db->query( $sql, "Title::getBrokenLinksTo" );
1188                 $retVal = array();
1189                 if ( $db->numRows( $res ) ) {
1190                         while ( $row = $db->fetchObject( $res ) ) {
1191                                 $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title );
1192                                 $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
1193                                 $retVal[] = $titleObj;
1194                         }
1195                 }
1196                 $db->freeResult( $res );
1197                 return $retVal;
1198         }
1199
1200         /**
1201          * Get a list of URLs to purge from the Squid cache when this
1202          * page changes
1203          *
1204          * @return array the URLs
1205          * @access public
1206          */
1207         function getSquidURLs() {
1208                 return array(
1209                         $this->getInternalURL(),
1210                         $this->getInternalURL( 'action=history' )
1211                 );
1212         }
1213
1214         /**
1215          * Move this page without authentication
1216          * @param Title &$nt the new page Title
1217          * @access public
1218          */
1219         function moveNoAuth( &$nt ) {
1220                 return $this->moveTo( $nt, false );
1221         }
1222
1223         /**
1224          * Move a title to a new location
1225          * @param Title &$nt the new title
1226          * @param bool $auth indicates whether $wgUser's permissions
1227          *      should be checked
1228          * @return mixed true on success, message name on failure
1229          * @access public
1230          */
1231         function moveTo( &$nt, $auth = true ) {
1232                 if( !$this or !$nt ) {
1233                         return 'badtitletext';
1234                 }
1235
1236                 $fname = 'Title::move';
1237                 $oldid = $this->getArticleID();
1238                 $newid = $nt->getArticleID();
1239
1240                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1241                         return 'articleexists';
1242                 }
1243                 if ( ( ! Namespace::isMovable( $this->getNamespace() ) ) ||
1244                          ( '' == $this->getDBkey() ) ||
1245                          ( '' != $this->getInterwiki() ) ||
1246                          ( !$oldid ) ||
1247                      ( ! Namespace::isMovable( $nt->getNamespace() ) ) ||
1248                          ( '' == $nt->getDBkey() ) ||
1249                          ( '' != $nt->getInterwiki() ) ) {
1250                         return 'badarticleerror';
1251                 }
1252
1253                 if ( $auth && ( !$this->userCanEdit() || !$nt->userCanEdit() ) ) {
1254                         return 'protectedpage';
1255                 }
1256
1257                 # The move is allowed only if (1) the target doesn't exist, or
1258                 # (2) the target is a redirect to the source, and has no history
1259                 # (so we can undo bad moves right after they're done).
1260
1261                 if ( 0 != $newid ) { # Target exists; check for validity
1262                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1263                                 return 'articleexists';
1264                         }
1265                         $this->moveOverExistingRedirect( $nt );
1266                 } else { # Target didn't exist, do normal move.
1267                         $this->moveToNewTitle( $nt, $newid );
1268                 }
1269
1270                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
1271
1272                 $dbw =& wfGetDB( DB_MASTER );
1273                 $sql = "UPDATE categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
1274                         " WHERE cl_from=" . $dbw->addQuotes( $this->getArticleID() ) .
1275                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
1276                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
1277
1278                 # Update watchlists
1279
1280                 $oldnamespace = $this->getNamespace() & ~1;
1281                 $newnamespace = $nt->getNamespace() & ~1;
1282                 $oldtitle = $this->getDBkey();
1283                 $newtitle = $nt->getDBkey();
1284
1285                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
1286                         WatchedItem::duplicateEntries( $this, $nt );
1287                 }
1288
1289                 # Update search engine
1290                 $u = new SearchUpdate( $oldid, $nt->getPrefixedDBkey() );
1291                 $u->doUpdate();
1292                 $u = new SearchUpdate( $newid, $this->getPrefixedDBkey(), '' );
1293                 $u->doUpdate();
1294
1295                 return true;
1296         }
1297
1298         /**
1299          * Move page to a title which is at present a redirect to the
1300          * source page
1301          *
1302          * @param Title &$nt the page to move to, which should currently
1303          *      be a redirect
1304          * @access private
1305          */
1306         /* private */ function moveOverExistingRedirect( &$nt ) {
1307                 global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
1308                 $fname = 'Title::moveOverExistingRedirect';
1309                 $comment = wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1310
1311                 $now = wfTimestampNow();
1312                 $won = wfInvertTimestamp( $now );
1313                 $newid = $nt->getArticleID();
1314                 $oldid = $this->getArticleID();
1315                 $dbw =& wfGetDB( DB_MASTER );
1316                 $links = $dbw->tableName( 'links' );
1317
1318                 # Change the name of the target page:
1319                 $dbw->updateArray( 'cur',
1320                         /* SET */ array(
1321                                 'cur_touched' => $dbw->timestamp($now),
1322                                 'cur_namespace' => $nt->getNamespace(),
1323                                 'cur_title' => $nt->getDBkey()
1324                         ),
1325                         /* WHERE */ array( 'cur_id' => $oldid ),
1326                         $fname
1327                 );
1328                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1329
1330                 # Repurpose the old redirect. We don't save it to history since
1331                 # by definition if we've got here it's rather uninteresting.
1332
1333                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1334                 $dbw->updateArray( 'cur',
1335                         /* SET */ array(
1336                                 'cur_touched' => $dbw->timestamp($now),
1337                                 'cur_timestamp' => $dbw->timestamp($now),
1338                                 'inverse_timestamp' => $won,
1339                                 'cur_namespace' => $this->getNamespace(),
1340                                 'cur_title' => $this->getDBkey(),
1341                                 'cur_text' => $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n",
1342                                 'cur_comment' => $comment,
1343                                 'cur_user' => $wgUser->getID(),
1344                                 'cur_minor_edit' => 0,
1345                                 'cur_counter' => 0,
1346                                 'cur_restrictions' => '',
1347                                 'cur_user_text' => $wgUser->getName(),
1348                                 'cur_is_redirect' => 1,
1349                                 'cur_is_new' => 1
1350                         ),
1351                         /* WHERE */ array( 'cur_id' => $newid ),
1352                         $fname
1353                 );
1354
1355                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1356
1357                 # Fix the redundant names for the past revisions of the target page.
1358                 # The redirect should have no old revisions.
1359                 $dbw->updateArray(
1360                         /* table */ 'old',
1361                         /* SET */ array(
1362                                 'old_namespace' => $nt->getNamespace(),
1363                                 'old_title' => $nt->getDBkey(),
1364                         ),
1365                         /* WHERE */ array(
1366                                 'old_namespace' => $this->getNamespace(),
1367                                 'old_title' => $this->getDBkey(),
1368                         ),
1369                         $fname
1370                 );
1371
1372                 RecentChange::notifyMoveOverRedirect( $now, $this, $nt, $wgUser, $comment );
1373
1374                 # Swap links
1375
1376                 # Load titles and IDs
1377                 $linksToOld = $this->getLinksTo( 'FOR UPDATE' );
1378                 $linksToNew = $nt->getLinksTo( 'FOR UPDATE' );
1379
1380                 # Delete them all
1381                 $sql = "DELETE FROM $links WHERE l_to=$oldid OR l_to=$newid";
1382                 $dbw->query( $sql, $fname );
1383
1384                 # Reinsert
1385                 if ( count( $linksToOld ) || count( $linksToNew )) {
1386                         $sql = "INSERT INTO $links (l_from,l_to) VALUES ";
1387                         $first = true;
1388
1389                         # Insert links to old title
1390                         foreach ( $linksToOld as $linkTitle ) {
1391                                 if ( $first ) {
1392                                         $first = false;
1393                                 } else {
1394                                         $sql .= ',';
1395                                 }
1396                                 $id = $linkTitle->getArticleID();
1397                                 $sql .= "($id,$newid)";
1398                         }
1399
1400                         # Insert links to new title
1401                         foreach ( $linksToNew as $linkTitle ) {
1402                                 if ( $first ) {
1403                                         $first = false;
1404                                 } else {
1405                                         $sql .= ',';
1406                                 }
1407                                 $id = $linkTitle->getArticleID();
1408                                 $sql .= "($id, $oldid)";
1409                         }
1410
1411                         $dbw->query( $sql, DB_MASTER, $fname );
1412                 }
1413
1414                 # Now, we record the link from the redirect to the new title.
1415                 # It should have no other outgoing links...
1416                 $dbw->delete( 'links', array( 'l_from' => $newid ) );
1417                 $dbw->insertArray( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ) );
1418
1419                 # Clear linkscc
1420                 LinkCache::linksccClearLinksTo( $oldid );
1421                 LinkCache::linksccClearLinksTo( $newid );
1422
1423                 # Purge squid
1424                 if ( $wgUseSquid ) {
1425                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1426                         $u = new SquidUpdate( $urls );
1427                         $u->doUpdate();
1428                 }
1429         }
1430
1431         /**
1432          * Move page to non-existing title.
1433          * @param Title &$nt the new Title
1434          * @param int &$newid set to be the new article ID
1435          * @access private
1436          */
1437         /* private */ function moveToNewTitle( &$nt, &$newid ) {
1438                 global $wgUser, $wgLinkCache, $wgUseSquid;
1439                 $fname = 'MovePageForm::moveToNewTitle';
1440                 $comment = wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1441
1442                 $newid = $nt->getArticleID();
1443                 $oldid = $this->getArticleID();
1444                 $dbw =& wfGetDB( DB_MASTER );
1445                 $now = $dbw->timestamp();
1446                 $won = wfInvertTimestamp( wfTimestamp(TS_MW,$now) );
1447                 wfSeedRandom();
1448                 $rand = number_format( mt_rand() / mt_getrandmax(), 12, '.', '' );
1449
1450                 # Rename cur entry
1451                 $dbw->updateArray( 'cur',
1452                         /* SET */ array(
1453                                 'cur_touched' => $now,
1454                                 'cur_namespace' => $nt->getNamespace(),
1455                                 'cur_title' => $nt->getDBkey()
1456                         ),
1457                         /* WHERE */ array( 'cur_id' => $oldid ),
1458                         $fname
1459                 );
1460
1461                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1462
1463                 # Insert redirect
1464                 $dbw->insertArray( 'cur', array(
1465                         'cur_id' => $dbw->nextSequenceValue('cur_cur_id_seq'),
1466                         'cur_namespace' => $this->getNamespace(),
1467                         'cur_title' => $this->getDBkey(),
1468                         'cur_comment' => $comment,
1469                         'cur_user' => $wgUser->getID(),
1470                         'cur_user_text' => $wgUser->getName(),
1471                         'cur_timestamp' => $now,
1472                         'inverse_timestamp' => $won,
1473                         'cur_touched' => $now,
1474                         'cur_is_redirect' => 1,
1475                         'cur_random' => $rand,
1476                         'cur_is_new' => 1,
1477                         'cur_text' => "#REDIRECT [[" . $nt->getPrefixedText() . "]]\n" ), $fname
1478                 );
1479                 $newid = $dbw->insertId();
1480                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1481
1482                 # Rename old entries
1483                 $dbw->updateArray(
1484                         /* table */ 'old',
1485                         /* SET */ array(
1486                                 'old_namespace' => $nt->getNamespace(),
1487                                 'old_title' => $nt->getDBkey()
1488                         ),
1489                         /* WHERE */ array(
1490                                 'old_namespace' => $this->getNamespace(),
1491                                 'old_title' => $this->getDBkey()
1492                         ), $fname
1493                 );
1494
1495                 # Record in RC
1496                 RecentChange::notifyMoveToNew( $now, $this, $nt, $wgUser, $comment );
1497
1498                 # Purge squid and linkscc as per article creation
1499                 Article::onArticleCreate( $nt );
1500
1501                 # Any text links to the old title must be reassigned to the redirect
1502                 $dbw->updateArray( 'links', array( 'l_to' => $newid ), array( 'l_to' => $oldid ), $fname );
1503                 LinkCache::linksccClearLinksTo( $oldid );
1504
1505                 # Record the just-created redirect's linking to the page
1506                 $dbw->insertArray( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ), $fname );
1507
1508                 # Non-existent target may have had broken links to it; these must
1509                 # now be removed and made into good links.
1510                 $update = new LinksUpdate( $oldid, $nt->getPrefixedDBkey() );
1511                 $update->fixBrokenLinks();
1512
1513                 # Purge old title from squid
1514                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1515                 $titles = $nt->getLinksTo();
1516                 if ( $wgUseSquid ) {
1517                         $urls = $this->getSquidURLs();
1518                         foreach ( $titles as $linkTitle ) {
1519                                 $urls[] = $linkTitle->getInternalURL();
1520                         }
1521                         $u = new SquidUpdate( $urls );
1522                         $u->doUpdate();
1523                 }
1524         }
1525
1526         /**
1527          * Checks if $this can be moved to a given Title
1528          * - Selects for update, so don't call it unless you mean business
1529          *
1530          * @param Title &$nt the new title to check
1531          * @access public
1532          */
1533         function isValidMoveTarget( $nt ) {
1534                 $fname = 'Title::isValidMoveTarget';
1535                 $dbw =& wfGetDB( DB_MASTER );
1536
1537                 # Is it a redirect?
1538                 $id  = $nt->getArticleID();
1539                 $obj = $dbw->getArray( 'cur', array( 'cur_is_redirect','cur_text' ),
1540                         array( 'cur_id' => $id ), $fname, 'FOR UPDATE' );
1541
1542                 if ( !$obj || 0 == $obj->cur_is_redirect ) {
1543                         # Not a redirect
1544                         return false;
1545                 }
1546
1547                 # Does the redirect point to the source?
1548                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $obj->cur_text, $m ) ) {
1549                         $redirTitle = Title::newFromText( $m[1] );
1550                         if( !is_object( $redirTitle ) ||
1551                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1552                                 return false;
1553                         }
1554                 }
1555
1556                 # Does the article have a history?
1557                 $row = $dbw->getArray( 'old', array( 'old_id' ),
1558                         array(
1559                                 'old_namespace' => $nt->getNamespace(),
1560                                 'old_title' => $nt->getDBkey()
1561                         ), $fname, 'FOR UPDATE'
1562                 );
1563
1564                 # Return true if there was no history
1565                 return $row === false;
1566         }
1567
1568         /**
1569          * Create a redirect; fails if the title already exists; does
1570          * not notify RC
1571          *
1572          * @param Title $dest the destination of the redirect
1573          * @param string $comment the comment string describing the move
1574          * @return bool true on success
1575          * @access public
1576          */
1577         function createRedirect( $dest, $comment ) {
1578                 global $wgUser;
1579                 if ( $this->getArticleID() ) {
1580                         return false;
1581                 }
1582
1583                 $fname = 'Title::createRedirect';
1584                 $dbw =& wfGetDB( DB_MASTER );
1585                 $now = wfTimestampNow();
1586                 $won = wfInvertTimestamp( $now );
1587                 $seqVal = $dbw->nextSequenceValue( 'cur_cur_id_seq' );
1588
1589                 $dbw->insertArray( 'cur', array(
1590                         'cur_id' => $seqVal,
1591                         'cur_namespace' => $this->getNamespace(),
1592                         'cur_title' => $this->getDBkey(),
1593                         'cur_comment' => $comment,
1594                         'cur_user' => $wgUser->getID(),
1595                         'cur_user_text' => $wgUser->getName(),
1596                         'cur_timestamp' => $now,
1597                         'inverse_timestamp' => $won,
1598                         'cur_touched' => $now,
1599                         'cur_is_redirect' => 1,
1600                         'cur_is_new' => 1,
1601                         'cur_text' => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n"
1602                 ), $fname );
1603                 $newid = $dbw->insertId();
1604                 $this->resetArticleID( $newid );
1605
1606                 # Link table
1607                 if ( $dest->getArticleID() ) {
1608                         $dbw->insertArray( 'links',
1609                                 array(
1610                                         'l_to' => $dest->getArticleID(),
1611                                         'l_from' => $newid
1612                                 ), $fname
1613                         );
1614                 } else {
1615                         $dbw->insertArray( 'brokenlinks',
1616                                 array(
1617                                         'bl_to' => $dest->getPrefixedDBkey(),
1618                                         'bl_from' => $newid
1619                                 ), $fname
1620                         );
1621                 }
1622
1623                 Article::onArticleCreate( $this );
1624                 return true;
1625         }
1626
1627         /**
1628          * Get categories to which this Title belongs and return an array of
1629          * categories' names.
1630          *
1631          * @return array an array of parents in the form:
1632          *      $parent => $currentarticle
1633          * @access public
1634          */
1635         function getParentCategories() {
1636                 global $wgContLang,$wgUser;
1637
1638                 $titlekey = $this->getArticleId();
1639                 $sk =& $wgUser->getSkin();
1640                 $parents = array();
1641                 $dbr =& wfGetDB( DB_SLAVE );
1642                 $cur = $dbr->tableName( 'cur' );
1643                 $categorylinks = $dbr->tableName( 'categorylinks' );
1644
1645                 # NEW SQL
1646                 $sql = "SELECT * FROM categorylinks"
1647                      ." WHERE cl_from='$titlekey'"
1648                          ." AND cl_from <> '0'"
1649                          ." ORDER BY cl_sortkey";
1650
1651                 $res = $dbr->query ( $sql ) ;
1652
1653                 if($dbr->numRows($res) > 0) {
1654                         while ( $x = $dbr->fetchObject ( $res ) )
1655                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
1656                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
1657                         $dbr->freeResult ( $res ) ;
1658                 } else {
1659                         $data = '';
1660                 }
1661                 return $data;
1662         }
1663
1664         /**
1665          * Go through all parent categories of this Title
1666          * @return array
1667          * @access public
1668          */
1669         function getCategorieBrowser() {
1670                 $parents = $this->getParentCategories();
1671
1672                 if($parents != '') {
1673                         foreach($parents as $parent => $current)
1674                         {
1675                                 $nt = Title::newFromText($parent);
1676                                 $stack[$parent] = $nt->getCategorieBrowser();
1677                         }
1678                         return $stack;
1679                 } else {
1680                         return array();
1681                 }
1682         }
1683
1684
1685         /**
1686          * Get an associative array for selecting this title from
1687          * the "cur" table
1688          *
1689          * @return array
1690          * @access public
1691          */
1692         function curCond() {
1693                 return array( 'cur_namespace' => $this->mNamespace, 'cur_title' => $this->mDbkeyform );
1694         }
1695
1696         /**
1697          * Get an associative array for selecting this title from the
1698          * "old" table
1699          *
1700          * @return array
1701          * @access public
1702          */
1703         function oldCond() {
1704                 return array( 'old_namespace' => $this->mNamespace, 'old_title' => $this->mDbkeyform );
1705         }
1706
1707         /**
1708          * Get the revision ID of the previous revision
1709          *
1710          * @param integer $revision  Revision ID. Get the revision that was before this one.
1711          * @return interger $oldrevision|false
1712          */
1713         function getPreviousRevisionID( $revision ) {
1714                 $dbr =& wfGetDB( DB_SLAVE );
1715                 return $dbr->selectField( 'old', 'old_id',
1716                         'old_title=' . $dbr->addQuotes( $this->getDBkey() ) .
1717                         ' AND old_namespace=' . IntVal( $this->getNamespace() ) .
1718                         ' AND old_id<' . IntVal( $revision ) . ' ORDER BY old_id DESC' );
1719         }
1720
1721         /**
1722          * Get the revision ID of the next revision
1723          *
1724          * @param integer $revision  Revision ID. Get the revision that was after this one.
1725          * @return interger $oldrevision|false
1726          */
1727         function getNextRevisionID( $revision ) {
1728                 $dbr =& wfGetDB( DB_SLAVE );
1729                 return $dbr->selectField( 'old', 'old_id',
1730                         'old_title=' . $dbr->addQuotes( $this->getDBkey() ) .
1731                         ' AND old_namespace=' . IntVal( $this->getNamespace() ) .
1732                         ' AND old_id>' . IntVal( $revision ) . ' ORDER BY old_id' );
1733         }
1734
1735 }
1736 ?>