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                 /**
  98                  * Convert things like &eacute; into real text...
  99                  */
 100                 global $wgInputEncoding;
 101                 $text = do_html_entity_decode( $text, ENT_COMPAT, $wgInputEncoding );
 102
 103                 /**
 104                  * Convert things like &#257; or &#x3017; into real text...
 105                  * WARNING: Not friendly to internal links on a latin-1 wiki.
 106                  */
 107                 $text = wfMungeToUtf8( $text );
 108
 109                 # What was this for? TS 2004-03-03
 110                 # $text = urldecode( $text );
 111
 112                 $t =& new Title();
 113                 $t->mDbkeyform = str_replace( ' ', '_', $text );
 114                 $t->mDefaultNamespace = $defaultNamespace;
 115
 116                 if( $t->secureAndSplit() ) {
 117                         wfProfileOut( $fname );
 118                         return $t;
 119                 } else {
 120                         wfProfileOut( $fname );
 121                         return NULL;
 122                 }
 123         }
 124
 125         /**
 126          * Create a new Title from URL-encoded text. Ensures that
 127          * the given title's length does not exceed the maximum.
 128          * @param string $url the title, as might be taken from a URL
 129          * @return Title the new object, or NULL on an error
 130          * @static
 131          * @access public
 132          */
 133         /* static */ function newFromURL( $url ) {
 134                 global $wgLang, $wgServer;
 135                 $t = new Title();
 136
 137                 # For compatibility with old buggy URLs. "+" is not valid in titles,
 138                 # but some URLs used it as a space replacement and they still come
 139                 # from some external search tools.
 140                 $s = str_replace( '+', ' ', $url );
 141
 142                 $t->mDbkeyform = str_replace( ' ', '_', $s );
 143                 if( $t->secureAndSplit() ) {
 144                         return $t;
 145                 } else {
 146                         return NULL;
 147                 }
 148         }
 149
 150         /**
 151          * Create a new Title from an article ID
 152          * @todo This is inefficiently implemented, the cur row is requested
 153          * but not used for anything else
 154          * @param int $id the cur_id corresponding to the Title to create
 155          * @return Title the new object, or NULL on an error
 156          * @access public
 157          */
 158         /* static */ function newFromID( $id ) {
 159                 $fname = 'Title::newFromID';
 160                 $dbr =& wfGetDB( DB_SLAVE );
 161                 $row = $dbr->selectRow( 'cur', array( 'cur_namespace', 'cur_title' ),
 162                         array( 'cur_id' => $id ), $fname );
 163                 if ( $row !== false ) {
 164                         $title = Title::makeTitle( $row->cur_namespace, $row->cur_title );
 165                 } else {
 166                         $title = NULL;
 167                 }
 168                 return $title;
 169         }
 170
 171         /**
 172          * Create a new Title from a namespace index and a DB key.
 173          * It's assumed that $ns and $title are *valid*, for instance when
 174          * they came directly from the database or a special page name.
 175          * @param int $ns the namespace of the article
 176          * @param string $title the unprefixed database key form
 177          * @return Title the new object
 178          * @static
 179          * @access public
 180          */
 181         /* static */ function &makeTitle( $ns, $title ) {
 182                 $t =& new Title();
 183                 $t->mInterwiki = '';
 184                 $t->mFragment = '';
 185                 $t->mNamespace = IntVal( $ns );
 186                 $t->mDbkeyform = $title;
 187                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 188                 $t->mUrlform = wfUrlencode( $title );
 189                 $t->mTextform = str_replace( '_', ' ', $title );
 190                 return $t;
 191         }
 192
 193         /**
 194          * Create a new Title frrom a namespace index and a DB key.
 195          * The parameters will be checked for validity, which is a bit slower
 196          * than makeTitle() but safer for user-provided data.
 197          * @param int $ns the namespace of the article
 198          * @param string $title the database key form
 199          * @return Title the new object, or NULL on an error
 200          * @static
 201          * @access public
 202          */
 203         /* static */ function makeTitleSafe( $ns, $title ) {
 204                 $t = new Title();
 205                 $t->mDbkeyform = Title::makeName( $ns, $title );
 206                 if( $t->secureAndSplit() ) {
 207                         return $t;
 208                 } else {
 209                         return NULL;
 210                 }
 211         }
 212
 213         /**
 214          * Create a new Title for the Main Page
 215          * @static
 216          * @return Title the new object
 217          * @access public
 218          */
 219         /* static */ function newMainPage() {
 220                 return Title::newFromText( wfMsgForContent( 'mainpage' ) );
 221         }
 222
 223         /**
 224          * Create a new Title for a redirect
 225          * @param string $text the redirect title text
 226          * @return Title the new object, or NULL if the text is not a
 227          *      valid redirect
 228          * @static
 229          * @access public
 230          */
 231         /* static */ function newFromRedirect( $text ) {
 232                 global $wgMwRedir;
 233                 $rt = NULL;
 234                 if ( $wgMwRedir->matchStart( $text ) ) {
 235                         if ( preg_match( '/\\[\\[([^\\]\\|]+)[\\]\\|]/', $text, $m ) ) {
 236                                 # categories are escaped using : for example one can enter:
 237                                 # #REDIRECT [[:Category:Music]]. Need to remove it.
 238                                 if ( substr($m[1],0,1) == ':') {
 239                                         # We don't want to keep the ':'
 240                                         $m[1] = substr( $m[1], 1 );
 241                                 }
 242
 243                                 $rt = Title::newFromText( $m[1] );
 244                                 # Disallow redirects to Special:Userlogout
 245                                 if ( !is_null($rt) && $rt->getNamespace() == NS_SPECIAL && preg_match( '/^Userlogout/i', $rt->getText() ) ) {
 246                                         $rt = NULL;
 247                                 }
 248                         }
 249                 }
 250                 return $rt;
 251         }
 252
 253 #----------------------------------------------------------------------------
 254 #       Static functions
 255 #----------------------------------------------------------------------------
 256
 257         /**
 258          * Get the prefixed DB key associated with an ID
 259          * @param int $id the cur_id of the article
 260          * @return Title an object representing the article, or NULL
 261          *      if no such article was found
 262          * @static
 263          * @access public
 264          */
 265         /* static */ function nameOf( $id ) {
 266                 $fname = 'Title::nameOf';
 267                 $dbr =& wfGetDB( DB_SLAVE );
 268
 269                 $s = $dbr->selectRow( 'cur', array( 'cur_namespace','cur_title' ),  array( 'cur_id' => $id ), $fname );
 270                 if ( $s === false ) { return NULL; }
 271
 272                 $n = Title::makeName( $s->cur_namespace, $s->cur_title );
 273                 return $n;
 274         }
 275
 276         /**
 277          * Get a regex character class describing the legal characters in a link
 278          * @return string the list of characters, not delimited
 279          * @static
 280          * @access public
 281          */
 282         /* static */ function legalChars() {
 283                 # Missing characters:
 284                 #  * []|# Needed for link syntax
 285                 #  * % and + are corrupted by Apache when they appear in the path
 286                 #
 287                 # % seems to work though
 288                 #
 289                 # The problem with % is that URLs are double-unescaped: once by Apache's
 290                 # path conversion code, and again by PHP. So %253F, for example, becomes "?".
 291                 # Our code does not double-escape to compensate for this, indeed double escaping
 292                 # would break if the double-escaped title was passed in the query string
 293                 # rather than the path. This is a minor security issue because articles can be
 294                 # created such that they are hard to view or edit. -- TS
 295                 #
 296                 # Theoretically 0x80-0x9F of ISO 8859-1 should be disallowed, but
 297                 # this breaks interlanguage links
 298
 299                 $set = " %!\"$&'()*,\\-.\\/0-9:;=?@A-Z\\\\^_`a-z~\\x80-\\xFF";
 300                 return $set;
 301         }
 302
 303         /**
 304          * Get a string representation of a title suitable for
 305          * including in a search index
 306          *
 307          * @param int $ns a namespace index
 308          * @param string $title text-form main part
 309          * @return string a stripped-down title string ready for the
 310          *      search index
 311          */
 312         /* static */ function indexTitle( $ns, $title ) {
 313                 global $wgDBminWordLen, $wgContLang;
 314                 require_once( 'SearchEngine.php' );
 315
 316                 $lc = SearchEngine::legalSearchChars() . '&#;';
 317                 $t = $wgContLang->stripForSearch( $title );
 318                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 319                 $t = strtolower( $t );
 320
 321                 # Handle 's, s'
 322                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 323                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 324
 325                 $t = preg_replace( "/\\s+/", ' ', $t );
 326
 327                 if ( $ns == NS_IMAGE ) {
 328                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 329                 }
 330                 return trim( $t );
 331         }
 332
 333         /*
 334          * Make a prefixed DB key from a DB key and a namespace index
 335          * @param int $ns numerical representation of the namespace
 336          * @param string $title the DB key form the title
 337          * @return string the prefixed form of the title
 338          */
 339         /* static */ function makeName( $ns, $title ) {
 340                 global $wgContLang;
 341
 342                 $n = $wgContLang->getNsText( $ns );
 343                 if ( '' == $n ) { return $title; }
 344                 else { return $n.':'.$title; }
 345         }
 346
 347         /**
 348          * Returns the URL associated with an interwiki prefix
 349          * @param string $key the interwiki prefix (e.g. "MeatBall")
 350          * @return the associated URL, containing "$1", which should be
 351          *      replaced by an article title
 352          * @static (arguably)
 353          * @access public
 354          */
 355         function getInterwikiLink( $key ) {
 356                 global $wgMemc, $wgDBname, $wgInterwikiExpiry, $wgTitleInterwikiCache;
 357                 $fname = 'Title::getInterwikiLink';
 358
 359                 wfProfileIn( $fname );
 360
 361                 $k = $wgDBname.':interwiki:'.$key;
 362                 if( array_key_exists( $k, $wgTitleInterwikiCache ) ) {
 363                         wfProfileOut( $fname );
 364                         return $wgTitleInterwikiCache[$k]->iw_url;
 365                 }
 366
 367                 $s = $wgMemc->get( $k );
 368                 # Ignore old keys with no iw_local
 369                 if( $s && isset( $s->iw_local ) ) {
 370                         $wgTitleInterwikiCache[$k] = $s;
 371                         wfProfileOut( $fname );
 372                         return $s->iw_url;
 373                 }
 374
 375                 $dbr =& wfGetDB( DB_SLAVE );
 376                 $res = $dbr->select( 'interwiki',
 377                         array( 'iw_url', 'iw_local' ),
 378                         array( 'iw_prefix' => $key ), $fname );
 379                 if( !$res ) {
 380                         wfProfileOut( $fname );
 381                         return '';
 382                 }
 383
 384                 $s = $dbr->fetchObject( $res );
 385                 if( !$s ) {
 386                         # Cache non-existence: create a blank object and save it to memcached
 387                         $s = (object)false;
 388                         $s->iw_url = '';
 389                         $s->iw_local = 0;
 390                 }
 391                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 392                 $wgTitleInterwikiCache[$k] = $s;
 393
 394                 wfProfileOut( $fname );
 395                 return $s->iw_url;
 396         }
 397
 398         /**
 399          * Determine whether the object refers to a page within
 400          * this project.
 401          *
 402          * @return bool TRUE if this is an in-project interwiki link
 403          *      or a wikilink, FALSE otherwise
 404          * @access public
 405          */
 406         function isLocal() {
 407                 global $wgTitleInterwikiCache, $wgDBname;
 408
 409                 if ( $this->mInterwiki != '' ) {
 410                         # Make sure key is loaded into cache
 411                         $this->getInterwikiLink( $this->mInterwiki );
 412                         $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 413                         return (bool)($wgTitleInterwikiCache[$k]->iw_local);
 414                 } else {
 415                         return true;
 416                 }
 417         }
 418
 419         /**
 420          * Update the cur_touched field for an array of title objects
 421          * @todo Inefficient unless the IDs are already loaded into the
 422          *      link cache
 423          * @param array $titles an array of Title objects to be touched
 424          * @param string $timestamp the timestamp to use instead of the
 425          *      default current time
 426          * @static
 427          * @access public
 428          */
 429         /* static */ function touchArray( $titles, $timestamp = '' ) {
 430                 if ( count( $titles ) == 0 ) {
 431                         return;
 432                 }
 433                 $dbw =& wfGetDB( DB_MASTER );
 434                 if ( $timestamp == '' ) {
 435                         $timestamp = $dbw->timestamp();
 436                 }
 437                 $cur = $dbw->tableName( 'cur' );
 438                 $sql = "UPDATE $cur SET cur_touched='{$timestamp}' WHERE cur_id IN (";
 439                 $first = true;
 440
 441                 foreach ( $titles as $title ) {
 442                         if ( ! $first ) {
 443                                 $sql .= ',';
 444                         }
 445                         $first = false;
 446                         $sql .= $title->getArticleID();
 447                 }
 448                 $sql .= ')';
 449                 if ( ! $first ) {
 450                         $dbw->query( $sql, 'Title::touchArray' );
 451                 }
 452         }
 453
 454 #----------------------------------------------------------------------------
 455 #       Other stuff
 456 #----------------------------------------------------------------------------
 457
 458         /** Simple accessors */
 459         /**
 460          * Get the text form (spaces not underscores) of the main part
 461          * @return string
 462          * @access public
 463          */
 464         function getText() { return $this->mTextform; }
 465         /**
 466          * Get the URL-encoded form of the main part
 467          * @return string
 468          * @access public
 469          */
 470         function getPartialURL() { return $this->mUrlform; }
 471         /**
 472          * Get the main part with underscores
 473          * @return string
 474          * @access public
 475          */
 476         function getDBkey() { return $this->mDbkeyform; }
 477         /**
 478          * Get the namespace index, i.e. one of the NS_xxxx constants
 479          * @return int
 480          * @access public
 481          */
 482         function getNamespace() { return $this->mNamespace; }
 483         /**
 484          * Get the interwiki prefix (or null string)
 485          * @return string
 486          * @access public
 487          */
 488         function getInterwiki() { return $this->mInterwiki; }
 489         /**
 490          * Get the Title fragment (i.e. the bit after the #)
 491          * @return string
 492          * @access public
 493          */
 494         function getFragment() { return $this->mFragment; }
 495         /**
 496          * Get the default namespace index, for when there is no namespace
 497          * @return int
 498          * @access public
 499          */
 500         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 501
 502         /**
 503          * Get title for search index
 504          * @return string a stripped-down title string ready for the
 505          *      search index
 506          */
 507         function getIndexTitle() {
 508                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 509         }
 510
 511         /**
 512          * Get the prefixed database key form
 513          * @return string the prefixed title, with underscores and
 514          *      any interwiki and namespace prefixes
 515          * @access public
 516          */
 517         function getPrefixedDBkey() {
 518                 $s = $this->prefix( $this->mDbkeyform );
 519                 $s = str_replace( ' ', '_', $s );
 520                 return $s;
 521         }
 522
 523         /**
 524          * Get the prefixed title with spaces.
 525          * This is the form usually used for display
 526          * @return string the prefixed title, with spaces
 527          * @access public
 528          */
 529         function getPrefixedText() {
 530                 global $wgContLang;
 531                 if ( empty( $this->mPrefixedText ) ) {
 532                         $s = $this->prefix( $this->mTextform );
 533                         $s = str_replace( '_', ' ', $s );
 534                         $this->mPrefixedText = $s;
 535                 }
 536                 return $this->mPrefixedText;
 537         }
 538
 539         /**
 540          * Get the prefixed title with spaces, plus any fragment
 541          * (part beginning with '#')
 542          * @return string the prefixed title, with spaces and
 543          *      the fragment, including '#'
 544          * @access public
 545          */
 546         function getFullText() {
 547                 global $wgContLang;
 548                 $text = $this->getPrefixedText();
 549                 if( '' != $this->mFragment ) {
 550                         $text .= '#' . $this->mFragment;
 551                 }
 552                 return $text;
 553         }
 554
 555         /**
 556          * Get a URL-encoded title (not an actual URL) including interwiki
 557          * @return string the URL-encoded form
 558          * @access public
 559          */
 560         function getPrefixedURL() {
 561                 $s = $this->prefix( $this->mDbkeyform );
 562                 $s = str_replace( ' ', '_', $s );
 563
 564                 $s = wfUrlencode ( $s ) ;
 565
 566                 # Cleaning up URL to make it look nice -- is this safe?
 567                 $s = preg_replace( '/%3[Aa]/', ':', $s );
 568                 $s = preg_replace( '/%2[Ff]/', '/', $s );
 569                 $s = str_replace( '%28', '(', $s );
 570                 $s = str_replace( '%29', ')', $s );
 571
 572                 return $s;
 573         }
 574
 575         /**
 576          * Get a real URL referring to this title, with interwiki link and
 577          * fragment
 578          *
 579          * @param string $query an optional query string, not used
 580          *      for interwiki links
 581          * @return string the URL
 582          * @access public
 583          */
 584         function getFullURL( $query = '' ) {
 585                 global $wgContLang, $wgArticlePath, $wgServer, $wgScript;
 586
 587                 if ( '' == $this->mInterwiki ) {
 588                         $p = $wgArticlePath;
 589                         return $wgServer . $this->getLocalUrl( $query );
 590                 } else {
 591                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 592                         $namespace = $wgContLang->getNsText( $this->mNamespace );
 593                         if ( '' != $namespace ) {
 594                                 # Can this actually happen? Interwikis shouldn't be parsed.
 595                                 $namepace .= ':';
 596                         }
 597                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 598                         if ( '' != $this->mFragment ) {
 599                                 $url .= '#' . $this->mFragment;
 600                         }
 601                         return $url;
 602                 }
 603         }
 604
 605         /**
 606          * Get a URL with no fragment or server name
 607          * @param string $query an optional query string; if not specified,
 608          *      $wgArticlePath will be used.
 609          * @return string the URL
 610          * @access public
 611          */
 612         function getLocalURL( $query = '' ) {
 613                 global $wgLang, $wgArticlePath, $wgScript;
 614
 615                 if ( $this->isExternal() ) {
 616                         return $this->getFullURL();
 617                 }
 618
 619                 $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 620                 if ( $query == '' ) {
 621                         $url = str_replace( '$1', $dbkey, $wgArticlePath );
 622                 } else {
 623                         if ( $query == '-' ) {
 624                                 $query = '';
 625                         }
 626                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 627                 }
 628                 return $url;
 629         }
 630
 631         /**
 632          * Get an HTML-escaped version of the URL form, suitable for
 633          * using in a link, without a server name or fragment
 634          * @param string $query an optional query string
 635          * @return string the URL
 636          * @access public
 637          */
 638         function escapeLocalURL( $query = '' ) {
 639                 return htmlspecialchars( $this->getLocalURL( $query ) );
 640         }
 641
 642         /**
 643          * Get an HTML-escaped version of the URL form, suitable for
 644          * using in a link, including the server name and fragment
 645          *
 646          * @return string the URL
 647          * @param string $query an optional query string
 648          * @access public
 649          */
 650         function escapeFullURL( $query = '' ) {
 651                 return htmlspecialchars( $this->getFullURL( $query ) );
 652         }
 653
 654         /**
 655          * Get the URL form for an internal link.
 656          * - Used in various Squid-related code, in case we have a different
 657          * internal hostname for the server from the exposed one.
 658          *
 659          * @param string $query an optional query string
 660          * @return string the URL
 661          * @access public
 662          */
 663         function getInternalURL( $query = '' ) {
 664                 global $wgInternalServer;
 665                 return $wgInternalServer . $this->getLocalURL( $query );
 666         }
 667
 668         /**
 669          * Get the edit URL for this Title
 670          * @return string the URL, or a null string if this is an
 671          *      interwiki link
 672          * @access public
 673          */
 674         function getEditURL() {
 675                 global $wgServer, $wgScript;
 676
 677                 if ( '' != $this->mInterwiki ) { return ''; }
 678                 $s = $this->getLocalURL( 'action=edit' );
 679
 680                 return $s;
 681         }
 682
 683         /**
 684          * Get the HTML-escaped displayable text form.
 685          * Used for the title field in <a> tags.
 686          * @return string the text, including any prefixes
 687          * @access public
 688          */
 689         function getEscapedText() {
 690                 return htmlspecialchars( $this->getPrefixedText() );
 691         }
 692
 693         /**
 694          * Is this Title interwiki?
 695          * @return boolean
 696          * @access public
 697          */
 698         function isExternal() { return ( '' != $this->mInterwiki ); }
 699
 700         /**
 701          * Does the title correspond to a protected article?
 702          * @return boolean
 703          * @access public
 704          */
 705         function isProtected() {
 706                 if ( -1 == $this->mNamespace ) { return true; }
 707                 $a = $this->getRestrictions();
 708                 if ( in_array( 'sysop', $a ) ) { return true; }
 709                 return false;
 710         }
 711
 712         /**
 713          * Is $wgUser is watching this page?
 714          * @return boolean
 715          * @access public
 716          */
 717         function userIsWatching() {
 718                 global $wgUser;
 719
 720                 if ( -1 == $this->mNamespace ) { return false; }
 721                 if ( 0 == $wgUser->getID() ) { return false; }
 722
 723                 return $wgUser->isWatched( $this );
 724         }
 725
 726         /**
 727          * Can $wgUser edit this page?
 728          * @return boolean
 729          * @access public
 730          */
 731         function userCanEdit() {
 732                 $fname = 'Title::userCanEdit';
 733                 wfProfileIn( $fname );
 734
 735                 global $wgUser;
 736                 if( NS_SPECIAL == $this->mNamespace ) {
 737                         wfProfileOut( $fname );
 738                         return false;
 739                 }
 740                 if( NS_MEDIAWIKI == $this->mNamespace &&
 741                     !$wgUser->isAllowed('editinterface') ) {
 742                         wfProfileOut( $fname );
 743                         return false;
 744                 }
 745                 if( $this->mDbkeyform == '_' ) {
 746                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
 747                         wfProfileOut( $fname );
 748                         return false;
 749                 }
 750
 751                 # protect global styles and js
 752                 if ( NS_MEDIAWIKI == $this->mNamespace
 753                  && preg_match("/\\.(css|js)$/", $this->mTextform )
 754                      && !$wgUser->isAllowed('editinterface') ) {
 755                         wfProfileOut( $fname );
 756                         return false;
 757                 }
 758
 759                 # protect css/js subpages of user pages
 760                 # XXX: this might be better using restrictions
 761                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
 762                 if( NS_USER == $this->mNamespace
 763                         && preg_match("/\\.(css|js)$/", $this->mTextform )
 764                         && !$wgUser->isAllowed('editinterface')
 765                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
 766                         wfProfileOut( $fname );
 767                         return false;
 768                 }
 769
 770                 foreach( $this->getRestrictions() as $right ) {
 771                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
 772                                 wfProfileOut( $fname );
 773                                 return false;
 774                         }
 775                 }
 776                 wfProfileOut( $fname );
 777                 return true;
 778         }
 779
 780         /**
 781          * Can $wgUser read this page?
 782          * @return boolean
 783          * @access public
 784          */
 785         function userCanRead() {
 786                 global $wgUser;
 787
 788                 if( $wgUser->isAllowed('read') ) {
 789                         return true;
 790                 } else {
 791                         global $wgWhitelistRead;
 792
 793                         /** If anon users can create an account,
 794                             they need to reach the login page first! */
 795                         if( $wgUser->isAllowed( 'createaccount' )
 796                             && $this->mId == NS_SPECIAL
 797                             && $this->getText() == 'Userlogin' ) {
 798                                 return true;
 799                         }
 800
 801                         /** some pages are explicitly allowed */
 802                         $name = $this->getPrefixedText();
 803                         if( in_array( $name, $wgWhitelistRead ) ) {
 804                                 return true;
 805                         }
 806
 807                         # Compatibility with old settings
 808                         if( $this->getNamespace() == NS_MAIN ) {
 809                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
 810                                         return true;
 811                                 }
 812                         }
 813                 }
 814                 return false;
 815         }
 816
 817         /**
 818          * Is this a .css or .js subpage of a user page?
 819          * @return bool
 820          * @access public
 821          */
 822         function isCssJsSubpage() {
 823                 return ( NS_USER == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
 824         }
 825         /**
 826          * Is this a .css subpage of a user page?
 827          * @return bool
 828          * @access public
 829          */
 830         function isCssSubpage() {
 831                 return ( NS_USER == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
 832         }
 833         /**
 834          * Is this a .js subpage of a user page?
 835          * @return bool
 836          * @access public
 837          */
 838         function isJsSubpage() {
 839                 return ( NS_USER == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
 840         }
 841         /**
 842          * Protect css/js subpages of user pages: can $wgUser edit
 843          * this page?
 844          *
 845          * @return boolean
 846          * @todo XXX: this might be better using restrictions
 847          * @access public
 848          */
 849         function userCanEditCssJsSubpage() {
 850                 global $wgUser;
 851                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
 852         }
 853
 854         /**
 855          * Accessor/initialisation for mRestrictions
 856          * @return array the array of groups allowed to edit this article
 857          * @access public
 858          */
 859         function getRestrictions() {
 860                 $id = $this->getArticleID();
 861                 if ( 0 == $id ) { return array(); }
 862
 863                 if ( ! $this->mRestrictionsLoaded ) {
 864                         $dbr =& wfGetDB( DB_SLAVE );
 865                         $res = $dbr->selectField( 'cur', 'cur_restrictions', 'cur_id='.$id );
 866                         $this->mRestrictions = explode( ',', trim( $res ) );
 867                         $this->mRestrictionsLoaded = true;
 868                 }
 869                 return $this->mRestrictions;
 870         }
 871
 872         /**
 873          * Is there a version of this page in the deletion archive?
 874          * @return int the number of archived revisions
 875          * @access public
 876          */
 877         function isDeleted() {
 878                 $fname = 'Title::isDeleted';
 879                 $dbr =& wfGetDB( DB_SLAVE );
 880                 $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
 881                         'ar_title' => $this->getDBkey() ), $fname );
 882                 return (int)$n;
 883         }
 884
 885         /**
 886          * Get the article ID for this Title from the link cache,
 887          * adding it if necessary
 888          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
 889          *      for update
 890          * @return int the ID
 891          * @access public
 892          */
 893         function getArticleID( $flags = 0 ) {
 894                 global $wgLinkCache;
 895
 896                 if ( $flags & GAID_FOR_UPDATE ) {
 897                         $oldUpdate = $wgLinkCache->forUpdate( true );
 898                         $this->mArticleID = $wgLinkCache->addLinkObj( $this );
 899                         $wgLinkCache->forUpdate( $oldUpdate );
 900                 } else {
 901                         if ( -1 == $this->mArticleID ) {
 902                                 $this->mArticleID = $wgLinkCache->addLinkObj( $this );
 903                         }
 904                 }
 905                 return $this->mArticleID;
 906         }
 907
 908         /**
 909          * This clears some fields in this object, and clears any associated
 910          * keys in the "bad links" section of $wgLinkCache.
 911          *
 912          * - This is called from Article::insertNewArticle() to allow
 913          * loading of the new cur_id. It's also called from
 914          * Article::doDeleteArticle()
 915          *
 916          * @param int $newid the new Article ID
 917          * @access public
 918          */
 919         function resetArticleID( $newid ) {
 920                 global $wgLinkCache;
 921                 $wgLinkCache->clearBadLink( $this->getPrefixedDBkey() );
 922
 923                 if ( 0 == $newid ) { $this->mArticleID = -1; }
 924                 else { $this->mArticleID = $newid; }
 925                 $this->mRestrictionsLoaded = false;
 926                 $this->mRestrictions = array();
 927         }
 928
 929         /**
 930          * Updates cur_touched for this page; called from LinksUpdate.php
 931          * @return bool true if the update succeded
 932          * @access public
 933          */
 934         function invalidateCache() {
 935                 $now = wfTimestampNow();
 936                 $dbw =& wfGetDB( DB_MASTER );
 937                 $success = $dbw->update( 'cur',
 938                         array( /* SET */
 939                                 'cur_touched' => $dbw->timestamp()
 940                         ), array( /* WHERE */
 941                                 'cur_namespace' => $this->getNamespace() ,
 942                                 'cur_title' => $this->getDBkey()
 943                         ), 'Title::invalidateCache'
 944                 );
 945                 return $success;
 946         }
 947
 948         /**
 949          * Prefix some arbitrary text with the namespace or interwiki prefix
 950          * of this object
 951          *
 952          * @param string $name the text
 953          * @return string the prefixed text
 954          * @access private
 955          */
 956         /* private */ function prefix( $name ) {
 957                 global $wgContLang;
 958
 959                 $p = '';
 960                 if ( '' != $this->mInterwiki ) {
 961                         $p = $this->mInterwiki . ':';
 962                 }
 963                 if ( 0 != $this->mNamespace ) {
 964                         $p .= $wgContLang->getNsText( $this->mNamespace ) . ':';
 965                 }
 966                 return $p . $name;
 967         }
 968
 969         /**
 970          * Secure and split - main initialisation function for this object
 971          *
 972          * Assumes that mDbkeyform has been set, and is urldecoded
 973          * and uses underscores, but not otherwise munged.  This function
 974          * removes illegal characters, splits off the interwiki and
 975          * namespace prefixes, sets the other forms, and canonicalizes
 976          * everything.
 977          * @return bool true on success
 978          * @access private
 979          */
 980         /* private */ function secureAndSplit() {
 981                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
 982                 $fname = 'Title::secureAndSplit';
 983                 wfProfileIn( $fname );
 984
 985                 static $imgpre = false;
 986                 static $rxTc = false;
 987
 988                 # Initialisation
 989                 if ( $imgpre === false ) {
 990                         $imgpre = ':' . $wgContLang->getNsText( NS_IMAGE ) . ':';
 991                         # % is needed as well
 992                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/S';
 993                 }
 994
 995                 $this->mInterwiki = $this->mFragment = '';
 996                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
 997
 998                 # Clean up whitespace
 999                 #
1000                 $t = preg_replace( "/[\\s_]+/", '_', $this->mDbkeyform );
1001                 $t = preg_replace( '/^_*(.*?)_*$/', '$1', $t );
1002
1003                 if ( '' == $t ) {
1004                         wfProfileOut( $fname );
1005                         return false;
1006                 }
1007
1008                 global $wgUseLatin1;
1009                 if( !$wgUseLatin1 &&  false !== strpos( $t, UTF8_REPLACEMENT ) ) {
1010                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1011                         wfProfileOut( $fname );
1012                         return false;
1013                 }
1014
1015                 $this->mDbkeyform = $t;
1016                 $done = false;
1017
1018                 # :Image: namespace
1019                 if ( 0 == strncasecmp( $imgpre, $t, strlen( $imgpre ) ) ) {
1020                         $t = substr( $t, 1 );
1021                 }
1022
1023                 # Initial colon indicating main namespace
1024                 if ( ':' == $t{0} ) {
1025                         $r = substr( $t, 1 );
1026                         $this->mNamespace = NS_MAIN;
1027                 } else {
1028                         # Namespace or interwiki prefix
1029                         if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $t, $m ) ) {
1030                                 #$p = strtolower( $m[1] );
1031                                 $p = $m[1];
1032                                 $lowerNs = strtolower( $p );
1033                                 if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1034                                         # Canonical namespace
1035                                         $t = $m[2];
1036                                         $this->mNamespace = $ns;
1037                                 } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1038                                         # Ordinary namespace
1039                                         $t = $m[2];
1040                                         $this->mNamespace = $ns;
1041                                 } elseif ( $this->getInterwikiLink( $p ) ) {
1042                                         # Interwiki link
1043                                         $t = $m[2];
1044                                         $this->mInterwiki = $p;
1045
1046                                         if ( !preg_match( "/^([A-Za-z0-9_\\x80-\\xff]+):(.*)$/", $t, $m ) ) {
1047                                                 $done = true;
1048                                         } elseif($this->mInterwiki != $wgLocalInterwiki) {
1049                                                 $done = true;
1050                                         }
1051                                 }
1052                         }
1053                         $r = $t;
1054                 }
1055
1056                 # Redundant interwiki prefix to the local wiki
1057                 if ( 0 == strcmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1058                         $this->mInterwiki = '';
1059                 }
1060                 # We already know that some pages won't be in the database!
1061                 #
1062                 if ( '' != $this->mInterwiki || -1 == $this->mNamespace ) {
1063                         $this->mArticleID = 0;
1064                 }
1065                 $f = strstr( $r, '#' );
1066                 if ( false !== $f ) {
1067                         $this->mFragment = substr( $f, 1 );
1068                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
1069                         # remove whitespace again: prevents "Foo_bar_#"
1070                         # becoming "Foo_bar_"
1071                         $r = preg_replace( '/_*$/', '', $r );
1072                 }
1073
1074                 # Reject illegal characters.
1075                 #
1076                 if( preg_match( $rxTc, $r ) ) {
1077                         wfProfileOut( $fname );
1078                         return false;
1079                 }
1080
1081                 /**
1082                  * Pages with "/./" or "/../" appearing in the URLs will
1083                  * often be unreachable due to the way web browsers deal
1084                  * with 'relative' URLs. Forbid them explicitly.
1085                  */
1086                 if ( strpos( $r, '.' ) !== false &&
1087                      ( $r === '.' || $r === '..' ||
1088                        strpos( $r, './' ) === 0  ||
1089                        strpos( $r, '../' ) === 0 ||
1090                        strpos( $r, '/./' ) !== false ||
1091                        strpos( $r, '/../' ) !== false ) )
1092                 {
1093                         wfProfileOut( $fname );
1094                         return false;
1095                 }
1096
1097                 # We shouldn't need to query the DB for the size.
1098                 #$maxSize = $dbr->textFieldSize( 'cur', 'cur_title' );
1099                 if ( strlen( $r ) > 255 ) {
1100                         return false;
1101                 }
1102
1103                 /**
1104                  * Normally, all wiki links are forced to have
1105                  * an initial capital letter so [[foo]] and [[Foo]]
1106                  * point to the same place.
1107                  *
1108                  * Don't force it for interwikis, since the other
1109                  * site might be case-sensitive.
1110                  */
1111                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1112                         $t = $wgContLang->ucfirst( $r );
1113                 } else {
1114                         $t = $r;
1115                 }
1116
1117                 # Fill fields
1118                 $this->mDbkeyform = $t;
1119                 $this->mUrlform = wfUrlencode( $t );
1120
1121                 $this->mTextform = str_replace( '_', ' ', $t );
1122
1123                 wfProfileOut( $fname );
1124                 return true;
1125         }
1126
1127         /**
1128          * Get a Title object associated with the talk page of this article
1129          * @return Title the object for the talk page
1130          * @access public
1131          */
1132         function getTalkPage() {
1133                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1134         }
1135
1136         /**
1137          * Get a title object associated with the subject page of this
1138          * talk page
1139          *
1140          * @return Title the object for the subject page
1141          * @access public
1142          */
1143         function getSubjectPage() {
1144                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1145         }
1146
1147         /**
1148          * Get an array of Title objects linking to this Title
1149          * - Also stores the IDs in the link cache.
1150          *
1151          * @param string $options may be FOR UPDATE
1152          * @return array the Title objects linking here
1153          * @access public
1154          */
1155         function getLinksTo( $options = '' ) {
1156                 global $wgLinkCache;
1157                 $id = $this->getArticleID();
1158
1159                 if ( $options ) {
1160                         $db =& wfGetDB( DB_MASTER );
1161                 } else {
1162                         $db =& wfGetDB( DB_SLAVE );
1163                 }
1164                 $cur = $db->tableName( 'cur' );
1165                 $links = $db->tableName( 'links' );
1166
1167                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM $cur,$links WHERE l_from=cur_id AND l_to={$id} $options";
1168                 $res = $db->query( $sql, 'Title::getLinksTo' );
1169                 $retVal = array();
1170                 if ( $db->numRows( $res ) ) {
1171                         while ( $row = $db->fetchObject( $res ) ) {
1172                                 if ( $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title ) ) {
1173                                         $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
1174                                         $retVal[] = $titleObj;
1175                                 }
1176                         }
1177                 }
1178                 $db->freeResult( $res );
1179                 return $retVal;
1180         }
1181
1182         /**
1183          * Get an array of Title objects linking to this non-existent title.
1184          * - Also stores the IDs in the link cache.
1185          *
1186          * @param string $options may be FOR UPDATE
1187          * @return array the Title objects linking here
1188          * @access public
1189          */
1190         function getBrokenLinksTo( $options = '' ) {
1191                 global $wgLinkCache;
1192
1193                 if ( $options ) {
1194                         $db =& wfGetDB( DB_MASTER );
1195                 } else {
1196                         $db =& wfGetDB( DB_SLAVE );
1197                 }
1198                 $cur = $db->tableName( 'cur' );
1199                 $brokenlinks = $db->tableName( 'brokenlinks' );
1200                 $encTitle = $db->strencode( $this->getPrefixedDBkey() );
1201
1202                 $sql = "SELECT cur_namespace,cur_title,cur_id FROM $brokenlinks,$cur " .
1203                   "WHERE bl_from=cur_id AND bl_to='$encTitle' $options";
1204                 $res = $db->query( $sql, "Title::getBrokenLinksTo" );
1205                 $retVal = array();
1206                 if ( $db->numRows( $res ) ) {
1207                         while ( $row = $db->fetchObject( $res ) ) {
1208                                 $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title );
1209                                 $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
1210                                 $retVal[] = $titleObj;
1211                         }
1212                 }
1213                 $db->freeResult( $res );
1214                 return $retVal;
1215         }
1216
1217         /**
1218          * Get a list of URLs to purge from the Squid cache when this
1219          * page changes
1220          *
1221          * @return array the URLs
1222          * @access public
1223          */
1224         function getSquidURLs() {
1225                 return array(
1226                         $this->getInternalURL(),
1227                         $this->getInternalURL( 'action=history' )
1228                 );
1229         }
1230
1231         /**
1232          * Move this page without authentication
1233          * @param Title &$nt the new page Title
1234          * @access public
1235          */
1236         function moveNoAuth( &$nt ) {
1237                 return $this->moveTo( $nt, false );
1238         }
1239
1240         /**
1241          * Move a title to a new location
1242          * @param Title &$nt the new title
1243          * @param bool $auth indicates whether $wgUser's permissions
1244          *      should be checked
1245          * @return mixed true on success, message name on failure
1246          * @access public
1247          */
1248         function moveTo( &$nt, $auth = true ) {
1249                 if( !$this or !$nt ) {
1250                         return 'badtitletext';
1251                 }
1252
1253                 $fname = 'Title::move';
1254                 $oldid = $this->getArticleID();
1255                 $newid = $nt->getArticleID();
1256
1257                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1258                         return 'articleexists';
1259                 }
1260                 if ( ( ! Namespace::isMovable( $this->getNamespace() ) ) ||
1261                          ( '' == $this->getDBkey() ) ||
1262                          ( '' != $this->getInterwiki() ) ||
1263                          ( !$oldid ) ||
1264                      ( ! Namespace::isMovable( $nt->getNamespace() ) ) ||
1265                          ( '' == $nt->getDBkey() ) ||
1266                          ( '' != $nt->getInterwiki() ) ) {
1267                         return 'badarticleerror';
1268                 }
1269
1270                 if ( $auth && ( !$this->userCanEdit() || !$nt->userCanEdit() ) ) {
1271                         return 'protectedpage';
1272                 }
1273
1274                 # The move is allowed only if (1) the target doesn't exist, or
1275                 # (2) the target is a redirect to the source, and has no history
1276                 # (so we can undo bad moves right after they're done).
1277
1278                 if ( 0 != $newid ) { # Target exists; check for validity
1279                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1280                                 return 'articleexists';
1281                         }
1282                         $this->moveOverExistingRedirect( $nt );
1283                 } else { # Target didn't exist, do normal move.
1284                         $this->moveToNewTitle( $nt, $newid );
1285                 }
1286
1287                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
1288
1289                 $dbw =& wfGetDB( DB_MASTER );
1290                 $sql = "UPDATE categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
1291                         " WHERE cl_from=" . $dbw->addQuotes( $this->getArticleID() ) .
1292                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
1293                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
1294
1295                 # Update watchlists
1296
1297                 $oldnamespace = $this->getNamespace() & ~1;
1298                 $newnamespace = $nt->getNamespace() & ~1;
1299                 $oldtitle = $this->getDBkey();
1300                 $newtitle = $nt->getDBkey();
1301
1302                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
1303                         WatchedItem::duplicateEntries( $this, $nt );
1304                 }
1305
1306                 # Update search engine
1307                 $u = new SearchUpdate( $oldid, $nt->getPrefixedDBkey() );
1308                 $u->doUpdate();
1309                 $u = new SearchUpdate( $newid, $this->getPrefixedDBkey(), '' );
1310                 $u->doUpdate();
1311
1312                 return true;
1313         }
1314
1315         /**
1316          * Move page to a title which is at present a redirect to the
1317          * source page
1318          *
1319          * @param Title &$nt the page to move to, which should currently
1320          *      be a redirect
1321          * @access private
1322          */
1323         /* private */ function moveOverExistingRedirect( &$nt ) {
1324                 global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
1325                 $fname = 'Title::moveOverExistingRedirect';
1326                 $comment = wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1327
1328                 $now = wfTimestampNow();
1329                 $won = wfInvertTimestamp( $now );
1330                 $newid = $nt->getArticleID();
1331                 $oldid = $this->getArticleID();
1332                 $dbw =& wfGetDB( DB_MASTER );
1333                 $links = $dbw->tableName( 'links' );
1334
1335                 # Change the name of the target page:
1336                 $dbw->update( 'cur',
1337                         /* SET */ array(
1338                                 'cur_touched' => $dbw->timestamp($now),
1339                                 'cur_namespace' => $nt->getNamespace(),
1340                                 'cur_title' => $nt->getDBkey()
1341                         ),
1342                         /* WHERE */ array( 'cur_id' => $oldid ),
1343                         $fname
1344                 );
1345                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1346
1347                 # Repurpose the old redirect. We don't save it to history since
1348                 # by definition if we've got here it's rather uninteresting.
1349
1350                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1351                 $dbw->update( 'cur',
1352                         /* SET */ array(
1353                                 'cur_touched' => $dbw->timestamp($now),
1354                                 'cur_timestamp' => $dbw->timestamp($now),
1355                                 'inverse_timestamp' => $won,
1356                                 'cur_namespace' => $this->getNamespace(),
1357                                 'cur_title' => $this->getDBkey(),
1358                                 'cur_text' => $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n",
1359                                 'cur_comment' => $comment,
1360                                 'cur_user' => $wgUser->getID(),
1361                                 'cur_minor_edit' => 0,
1362                                 'cur_counter' => 0,
1363                                 'cur_restrictions' => '',
1364                                 'cur_user_text' => $wgUser->getName(),
1365                                 'cur_is_redirect' => 1,
1366                                 'cur_is_new' => 1
1367                         ),
1368                         /* WHERE */ array( 'cur_id' => $newid ),
1369                         $fname
1370                 );
1371
1372                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1373
1374                 # Fix the redundant names for the past revisions of the target page.
1375                 # The redirect should have no old revisions.
1376                 $dbw->update(
1377                         /* table */ 'old',
1378                         /* SET */ array(
1379                                 'old_namespace' => $nt->getNamespace(),
1380                                 'old_title' => $nt->getDBkey(),
1381                         ),
1382                         /* WHERE */ array(
1383                                 'old_namespace' => $this->getNamespace(),
1384                                 'old_title' => $this->getDBkey(),
1385                         ),
1386                         $fname
1387                 );
1388
1389                 RecentChange::notifyMoveOverRedirect( $now, $this, $nt, $wgUser, $comment );
1390
1391                 # Swap links
1392
1393                 # Load titles and IDs
1394                 $linksToOld = $this->getLinksTo( 'FOR UPDATE' );
1395                 $linksToNew = $nt->getLinksTo( 'FOR UPDATE' );
1396
1397                 # Delete them all
1398                 $sql = "DELETE FROM $links WHERE l_to=$oldid OR l_to=$newid";
1399                 $dbw->query( $sql, $fname );
1400
1401                 # Reinsert
1402                 if ( count( $linksToOld ) || count( $linksToNew )) {
1403                         $sql = "INSERT INTO $links (l_from,l_to) VALUES ";
1404                         $first = true;
1405
1406                         # Insert links to old title
1407                         foreach ( $linksToOld as $linkTitle ) {
1408                                 if ( $first ) {
1409                                         $first = false;
1410                                 } else {
1411                                         $sql .= ',';
1412                                 }
1413                                 $id = $linkTitle->getArticleID();
1414                                 $sql .= "($id,$newid)";
1415                         }
1416
1417                         # Insert links to new title
1418                         foreach ( $linksToNew as $linkTitle ) {
1419                                 if ( $first ) {
1420                                         $first = false;
1421                                 } else {
1422                                         $sql .= ',';
1423                                 }
1424                                 $id = $linkTitle->getArticleID();
1425                                 $sql .= "($id, $oldid)";
1426                         }
1427
1428                         $dbw->query( $sql, DB_MASTER, $fname );
1429                 }
1430
1431                 # Now, we record the link from the redirect to the new title.
1432                 # It should have no other outgoing links...
1433                 $dbw->delete( 'links', array( 'l_from' => $newid ) );
1434                 $dbw->insert( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ) );
1435
1436                 # Clear linkscc
1437                 LinkCache::linksccClearLinksTo( $oldid );
1438                 LinkCache::linksccClearLinksTo( $newid );
1439
1440                 # Purge squid
1441                 if ( $wgUseSquid ) {
1442                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1443                         $u = new SquidUpdate( $urls );
1444                         $u->doUpdate();
1445                 }
1446         }
1447
1448         /**
1449          * Move page to non-existing title.
1450          * @param Title &$nt the new Title
1451          * @param int &$newid set to be the new article ID
1452          * @access private
1453          */
1454         /* private */ function moveToNewTitle( &$nt, &$newid ) {
1455                 global $wgUser, $wgLinkCache, $wgUseSquid;
1456                 $fname = 'MovePageForm::moveToNewTitle';
1457                 $comment = wfMsg( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1458
1459                 $newid = $nt->getArticleID();
1460                 $oldid = $this->getArticleID();
1461                 $dbw =& wfGetDB( DB_MASTER );
1462                 $now = $dbw->timestamp();
1463                 $won = wfInvertTimestamp( wfTimestamp(TS_MW,$now) );
1464                 wfSeedRandom();
1465                 $rand = wfRandom();
1466
1467                 # Rename cur entry
1468                 $dbw->update( 'cur',
1469                         /* SET */ array(
1470                                 'cur_touched' => $now,
1471                                 'cur_namespace' => $nt->getNamespace(),
1472                                 'cur_title' => $nt->getDBkey()
1473                         ),
1474                         /* WHERE */ array( 'cur_id' => $oldid ),
1475                         $fname
1476                 );
1477
1478                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1479
1480                 # Insert redirect
1481                 $dbw->insert( 'cur', array(
1482                         'cur_id' => $dbw->nextSequenceValue('cur_cur_id_seq'),
1483                         'cur_namespace' => $this->getNamespace(),
1484                         'cur_title' => $this->getDBkey(),
1485                         'cur_comment' => $comment,
1486                         'cur_user' => $wgUser->getID(),
1487                         'cur_user_text' => $wgUser->getName(),
1488                         'cur_timestamp' => $now,
1489                         'inverse_timestamp' => $won,
1490                         'cur_touched' => $now,
1491                         'cur_is_redirect' => 1,
1492                         'cur_random' => $rand,
1493                         'cur_is_new' => 1,
1494                         'cur_text' => "#REDIRECT [[" . $nt->getPrefixedText() . "]]\n" ), $fname
1495                 );
1496                 $newid = $dbw->insertId();
1497                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1498
1499                 # Rename old entries
1500                 $dbw->update(
1501                         /* table */ 'old',
1502                         /* SET */ array(
1503                                 'old_namespace' => $nt->getNamespace(),
1504                                 'old_title' => $nt->getDBkey()
1505                         ),
1506                         /* WHERE */ array(
1507                                 'old_namespace' => $this->getNamespace(),
1508                                 'old_title' => $this->getDBkey()
1509                         ), $fname
1510                 );
1511
1512                 # Record in RC
1513                 RecentChange::notifyMoveToNew( $now, $this, $nt, $wgUser, $comment );
1514
1515                 # Purge squid and linkscc as per article creation
1516                 Article::onArticleCreate( $nt );
1517
1518                 # Any text links to the old title must be reassigned to the redirect
1519                 $dbw->update( 'links', array( 'l_to' => $newid ), array( 'l_to' => $oldid ), $fname );
1520                 LinkCache::linksccClearLinksTo( $oldid );
1521
1522                 # Record the just-created redirect's linking to the page
1523                 $dbw->insert( 'links', array( 'l_from' => $newid, 'l_to' => $oldid ), $fname );
1524
1525                 # Non-existent target may have had broken links to it; these must
1526                 # now be removed and made into good links.
1527                 $update = new LinksUpdate( $oldid, $nt->getPrefixedDBkey() );
1528                 $update->fixBrokenLinks();
1529
1530                 # Purge old title from squid
1531                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1532                 $titles = $nt->getLinksTo();
1533                 if ( $wgUseSquid ) {
1534                         $urls = $this->getSquidURLs();
1535                         foreach ( $titles as $linkTitle ) {
1536                                 $urls[] = $linkTitle->getInternalURL();
1537                         }
1538                         $u = new SquidUpdate( $urls );
1539                         $u->doUpdate();
1540                 }
1541         }
1542
1543         /**
1544          * Checks if $this can be moved to a given Title
1545          * - Selects for update, so don't call it unless you mean business
1546          *
1547          * @param Title &$nt the new title to check
1548          * @access public
1549          */
1550         function isValidMoveTarget( $nt ) {
1551                 $fname = 'Title::isValidMoveTarget';
1552                 $dbw =& wfGetDB( DB_MASTER );
1553
1554                 # Is it a redirect?
1555                 $id  = $nt->getArticleID();
1556                 $obj = $dbw->selectRow( 'cur', array( 'cur_is_redirect','cur_text' ),
1557                         array( 'cur_id' => $id ), $fname, 'FOR UPDATE' );
1558
1559                 if ( !$obj || 0 == $obj->cur_is_redirect ) {
1560                         # Not a redirect
1561                         return false;
1562                 }
1563
1564                 # Does the redirect point to the source?
1565                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $obj->cur_text, $m ) ) {
1566                         $redirTitle = Title::newFromText( $m[1] );
1567                         if( !is_object( $redirTitle ) ||
1568                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1569                                 return false;
1570                         }
1571                 }
1572
1573                 # Does the article have a history?
1574                 $row = $dbw->selectRow( 'old', array( 'old_id' ),
1575                         array(
1576                                 'old_namespace' => $nt->getNamespace(),
1577                                 'old_title' => $nt->getDBkey()
1578                         ), $fname, 'FOR UPDATE'
1579                 );
1580
1581                 # Return true if there was no history
1582                 return $row === false;
1583         }
1584
1585         /**
1586          * Create a redirect; fails if the title already exists; does
1587          * not notify RC
1588          *
1589          * @param Title $dest the destination of the redirect
1590          * @param string $comment the comment string describing the move
1591          * @return bool true on success
1592          * @access public
1593          */
1594         function createRedirect( $dest, $comment ) {
1595                 global $wgUser;
1596                 if ( $this->getArticleID() ) {
1597                         return false;
1598                 }
1599
1600                 $fname = 'Title::createRedirect';
1601                 $dbw =& wfGetDB( DB_MASTER );
1602                 $now = wfTimestampNow();
1603                 $won = wfInvertTimestamp( $now );
1604                 $seqVal = $dbw->nextSequenceValue( 'cur_cur_id_seq' );
1605
1606                 $dbw->insert( 'cur', array(
1607                         'cur_id' => $seqVal,
1608                         'cur_namespace' => $this->getNamespace(),
1609                         'cur_title' => $this->getDBkey(),
1610                         'cur_comment' => $comment,
1611                         'cur_user' => $wgUser->getID(),
1612                         'cur_user_text' => $wgUser->getName(),
1613                         'cur_timestamp' => $now,
1614                         'inverse_timestamp' => $won,
1615                         'cur_touched' => $now,
1616                         'cur_is_redirect' => 1,
1617                         'cur_is_new' => 1,
1618                         'cur_text' => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n"
1619                 ), $fname );
1620                 $newid = $dbw->insertId();
1621                 $this->resetArticleID( $newid );
1622
1623                 # Link table
1624                 if ( $dest->getArticleID() ) {
1625                         $dbw->insert( 'links',
1626                                 array(
1627                                         'l_to' => $dest->getArticleID(),
1628                                         'l_from' => $newid
1629                                 ), $fname
1630                         );
1631                 } else {
1632                         $dbw->insert( 'brokenlinks',
1633                                 array(
1634                                         'bl_to' => $dest->getPrefixedDBkey(),
1635                                         'bl_from' => $newid
1636                                 ), $fname
1637                         );
1638                 }
1639
1640                 Article::onArticleCreate( $this );
1641                 return true;
1642         }
1643
1644         /**
1645          * Get categories to which this Title belongs and return an array of
1646          * categories' names.
1647          *
1648          * @return array an array of parents in the form:
1649          *      $parent => $currentarticle
1650          * @access public
1651          */
1652         function getParentCategories() {
1653                 global $wgContLang,$wgUser;
1654
1655                 $titlekey = $this->getArticleId();
1656                 $sk =& $wgUser->getSkin();
1657                 $parents = array();
1658                 $dbr =& wfGetDB( DB_SLAVE );
1659                 $categorylinks = $dbr->tableName( 'categorylinks' );
1660
1661                 # NEW SQL
1662                 $sql = "SELECT * FROM $categorylinks"
1663                      ." WHERE cl_from='$titlekey'"
1664                          ." AND cl_from <> '0'"
1665                          ." ORDER BY cl_sortkey";
1666
1667                 $res = $dbr->query ( $sql ) ;
1668
1669                 if($dbr->numRows($res) > 0) {
1670                         while ( $x = $dbr->fetchObject ( $res ) )
1671                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
1672                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
1673                         $dbr->freeResult ( $res ) ;
1674                 } else {
1675                         $data = '';
1676                 }
1677                 return $data;
1678         }
1679
1680         /**
1681          * Get a tree of parent categories
1682          * @param array $children an array with the children in the keys, to check for circular refs
1683          * @return array
1684          * @access public
1685          */
1686         function getParentCategoryTree( $children = array() ) {
1687                 $parents = $this->getParentCategories();
1688
1689                 if($parents != '') {
1690                         foreach($parents as $parent => $current)
1691                         {
1692                                 if ( array_key_exists( $parent, $children ) ) {
1693                                         # Circular reference
1694                                         $stack[$parent] = array();
1695                                 } else {
1696                                         $nt = Title::newFromText($parent);
1697                                         $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
1698                                 }
1699                         }
1700                         return $stack;
1701                 } else {
1702                         return array();
1703                 }
1704         }
1705
1706
1707         /**
1708          * Get an associative array for selecting this title from
1709          * the "cur" table
1710          *
1711          * @return array
1712          * @access public
1713          */
1714         function curCond() {
1715                 return array( 'cur_namespace' => $this->mNamespace, 'cur_title' => $this->mDbkeyform );
1716         }
1717
1718         /**
1719          * Get an associative array for selecting this title from the
1720          * "old" table
1721          *
1722          * @return array
1723          * @access public
1724          */
1725         function oldCond() {
1726                 return array( 'old_namespace' => $this->mNamespace, 'old_title' => $this->mDbkeyform );
1727         }
1728
1729         /**
1730          * Get the revision ID of the previous revision
1731          *
1732          * @param integer $revision  Revision ID. Get the revision that was before this one.
1733          * @return interger $oldrevision|false
1734          */
1735         function getPreviousRevisionID( $revision ) {
1736                 $dbr =& wfGetDB( DB_SLAVE );
1737                 return $dbr->selectField( 'old', 'old_id',
1738                         'old_title=' . $dbr->addQuotes( $this->getDBkey() ) .
1739                         ' AND old_namespace=' . IntVal( $this->getNamespace() ) .
1740                         ' AND old_id<' . IntVal( $revision ) . ' ORDER BY old_id DESC' );
1741         }
1742
1743         /**
1744          * Get the revision ID of the next revision
1745          *
1746          * @param integer $revision  Revision ID. Get the revision that was after this one.
1747          * @return interger $oldrevision|false
1748          */
1749         function getNextRevisionID( $revision ) {
1750                 $dbr =& wfGetDB( DB_SLAVE );
1751                 return $dbr->selectField( 'old', 'old_id',
1752                         'old_title=' . $dbr->addQuotes( $this->getDBkey() ) .
1753                         ' AND old_namespace=' . IntVal( $this->getNamespace() ) .
1754                         ' AND old_id>' . IntVal( $revision ) . ' ORDER BY old_id' );
1755         }
1756
1757 }
1758 ?>