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