isExpensive get default value
[lhc/web/wiklou.git] / includes / Title.php
index 62bc12d..2b6603a 100644 (file)
@@ -1,7 +1,7 @@
 <?php
 # See title.doc
 
-/* private static */ $title_interwiki_cache = array();
+$wgTitleInterwikiCache = array();
 
 # Title class
 # 
@@ -23,7 +23,9 @@ class Title {
                               # Only null or "sysop" are supported
        var $mRestrictionsLoaded; # Boolean for initialisation on demand
        var $mPrefixedText;       # Text form including namespace/interwiki, initialised on demand
-
+       var $mDefaultNamespace;   # Namespace index when there is no namespace
+                              # Zero except in {{transclusion}} tags
+       
 #----------------------------------------------------------------------------
 #   Construction
 #----------------------------------------------------------------------------
@@ -36,6 +38,7 @@ class Title {
                $this->mNamespace = 0;
                $this->mRestrictionsLoaded = false;
                $this->mRestrictions = array();
+        $this->mDefaultNamespace = 0;
        }
 
        # From a prefixed DB key
@@ -50,24 +53,17 @@ class Title {
        }
        
        # From text, such as what you would find in a link
-       /* static */ function newFromText( $text )
+       /* static */ function newFromText( $text, $defaultNamespace = 0 )
        {       
-               static $trans;
                $fname = "Title::newFromText";
                wfProfileIn( $fname );
-               
-               # Note - mixing latin1 named entities and unicode numbered
-               # ones will result in a bad link.
-               if( !isset( $trans ) ) {
-                       global $wgInputEncoding;
-                       $trans = array_flip( get_html_translation_table( HTML_ENTITIES ) );
-                       if( strcasecmp( "utf-8", $wgInputEncoding ) == 0 ) {
-                           $trans = array_map( "utf8_encode", $trans );
-                       }
+
+               if( is_object( $text ) ) {
+                       wfDebugDieBacktrace( "Called with object instead of string." );
                }
+               global $wgInputEncoding;
+               $text = do_html_entity_decode( $text, ENT_COMPAT, $wgInputEncoding );
 
-               $text = strtr( $text, $trans );
-               
                $text = wfMungeToUtf8( $text );
                
                
@@ -76,7 +72,12 @@ class Title {
 
                $t = new Title();
                $t->mDbkeyform = str_replace( " ", "_", $text );
+               $t->mDefaultNamespace = $defaultNamespace;
+
                wfProfileOut( $fname );
+               if ( !is_object( $t ) ) {
+                       var_dump( debug_backtrace() );
+               }
                if( $t->secureAndSplit() ) {
                        return $t;
                } else {
@@ -87,26 +88,44 @@ class Title {
        # From a URL-encoded title
        /* static */ function newFromURL( $url )
        {
-               global $wgLang, $wgServer;
+               global $wgLang, $wgServer, $wgIsMySQL, $wgIsPg;
                $t = new Title();
-               $s = urldecode( $url ); # This is technically wrong, as anything
-                                                               # we've gotten is already decoded by PHP.
-                                                               # Kept for backwards compatibility with
-                                                               # buggy URLs we had for a while...
-               $s = $url;
+               
+               # For compatibility with old buggy URLs. "+" is not valid in titles,
+               # but some URLs used it as a space replacement and they still come
+               # from some external search tools.
+               $s = str_replace( "+", " ", $url );
                
                # For links that came from outside, check for alternate/legacy
                # character encoding.
-               wfDebug( "Refer: {$_SERVER['HTTP_REFERER']}\n" );
                wfDebug( "Servr: $wgServer\n" );
                if( empty( $_SERVER["HTTP_REFERER"] ) ||
                        strncmp($wgServer, $_SERVER["HTTP_REFERER"], strlen( $wgServer ) ) ) 
                {
                        $s = $wgLang->checkTitleEncoding( $s );
+               } else {
+                       wfDebug( "Refer: {$_SERVER['HTTP_REFERER']}\n" );
                }
                
                $t->mDbkeyform = str_replace( " ", "_", $s );
                if( $t->secureAndSplit() ) {
+                       # check that lenght of title is < cur_title size
+                       if ($wgIsMySQL) {
+                               $sql = "SHOW COLUMNS FROM cur LIKE \"cur_title\";";
+                               $cur_title_object = wfFetchObject(wfQuery( $sql, DB_READ ));
+
+                               preg_match( "/\((.*)\)/", $cur_title_object->Type, $cur_title_type);
+                               $cur_title_size=$cur_title_type[1];
+                       } else {
+                               /* midom:FIXME pg_field_type does not return varchar length
+                                  assume 255 */
+                               $cur_title_size=255;
+                       }
+
+                       if (strlen($t->mDbkeyform) > $cur_title_size ) {
+                               return NULL;
+                       }
+
                        return $t;
                } else {
                        return NULL;
@@ -169,11 +188,12 @@ class Title {
                # Missing characters:
                #  * []|# Needed for link syntax
                #  * % and + are corrupted by Apache when they appear in the path
+               #  * % seems to work though
                # 
                # Theoretically 0x80-0x9F of ISO 8859-1 should be disallowed, but
                # this breaks interlanguage links
                
-               $set = " !\"$&'()*,\\-.\\/0-9:;<=>?@A-Z\\\\^_`a-z{}~\\x80-\\xFF";
+               $set = " %!\"$&'()*,\\-.\\/0-9:;<=>?@A-Z\\\\^_`a-z{}~\\x80-\\xFF";
                return $set;
        }
        
@@ -215,19 +235,22 @@ class Title {
        # The URL contains $1, which is replaced by the title
        function getInterwikiLink( $key )
        {       
-               global $wgMemc, $wgDBname, $title_interwiki_cache;
+               global $wgMemc, $wgDBname, $wgInterwikiExpiry;
+               static $wgTitleInterwikiCache = array();
+
                $k = "$wgDBname:interwiki:$key";
 
-               if( array_key_exists( $k, $title_interwiki_cache ) )
-                       return $title_interwiki_cache[$k]->iw_url;
+               if( array_key_exists( $k, $wgTitleInterwikiCache ) )
+                       return $wgTitleInterwikiCache[$k]->iw_url;
 
                $s = $wgMemc->get( $k ); 
-               if( $s ) { 
-                       $title_interwiki_cache[$k] = $s;
+               # Ignore old keys with no iw_local
+               if( $s && isset( $s->iw_local ) ) { 
+                       $wgTitleInterwikiCache[$k] = $s;
                        return $s->iw_url;
                }
                $dkey = wfStrencode( $key );
-               $query = "SELECT iw_url FROM interwiki WHERE iw_prefix='$dkey'";
+               $query = "SELECT iw_url,iw_local FROM interwiki WHERE iw_prefix='$dkey'";
                $res = wfQuery( $query, DB_READ, "Title::getInterwikiLink" );
                if(!$res) return "";
                
@@ -236,11 +259,50 @@ class Title {
                        $s = (object)false;
                        $s->iw_url = "";
                }
-               $wgMemc->set( $k, $s );
-               $title_interwiki_cache[$k] = $s;
+               $wgMemc->set( $k, $s, $wgInterwikiExpiry );
+               $wgTitleInterwikiCache[$k] = $s;
                return $s->iw_url;
        }
-       
+
+       function isLocal() {
+               global $wgTitleInterwikiCache, $wgDBname;
+
+               if ( $this->mInterwiki != "" ) {
+                       # Make sure key is loaded into cache
+                       $this->getInterwikiLink( $this->mInterwiki );
+                       $k = "$wgDBname:interwiki:" . $this->mInterwiki;
+                       return (bool)($wgTitleInterwikiCache[$k]->iw_local);
+               } else {
+                       return true;
+               }
+       }
+
+       # Update the cur_touched field for an array of title objects
+       # Inefficient unless the IDs are already loaded into the link cache
+       /* static */ function touchArray( $titles, $timestamp = "" ) {
+               if ( count( $titles ) == 0 ) {
+                       return;
+               }
+               if ( $timestamp == "" ) {
+                       $timestamp = wfTimestampNow();
+               }
+               $sql = "UPDATE cur SET cur_touched='{$timestamp}' WHERE cur_id IN (";
+               $first = true;
+
+               foreach ( $titles as $title ) {
+                       if ( ! $first ) { 
+                               $sql .= ","; 
+                       }
+
+                       $first = false;
+                       $sql .= $title->getArticleID();
+               }
+               $sql .= ")";
+               if ( ! $first ) {
+                       wfQuery( $sql, DB_WRITE, "Title::touchArray" );
+               }
+       }
+
 #----------------------------------------------------------------------------
 #      Other stuff
 #----------------------------------------------------------------------------
@@ -255,6 +317,7 @@ class Title {
        function setNamespace( $n ) { $this->mNamespace = $n; }
        function getInterwiki() { return $this->mInterwiki; }
        function getFragment() { return $this->mFragment; }
+       function getDefaultNamespace() { return $this->mDefaultNamespace; }
 
        # Get title for search index
        function getIndexTitle()
@@ -431,11 +494,24 @@ class Title {
        function userCanEdit()
        {
                global $wgUser;
-
                if ( -1 == $this->mNamespace ) { return false; }
+               if ( NS_MEDIAWIKI == $this->mNamespace && !$wgUser->isSysop() ) { return false; }
                # if ( 0 == $this->getArticleID() ) { return false; }
                if ( $this->mDbkeyform == "_" ) { return false; }
-
+               # protect global styles and js
+               if ( NS_MEDIAWIKI == $this->mNamespace 
+                    && preg_match("/\\.(css|js)$/", $this->mTextform )
+                    && !$wgUser->isSysop() )
+               { return false; }
+               //if ( $this->isCssJsSubpage() and !$this->userCanEditCssJsSubpage() ) { return false; }
+               # protect css/js subpages of user pages
+               # XXX: this might be better using restrictions
+               # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
+               if( Namespace::getUser() == $this->mNamespace
+                       and preg_match("/\\.(css|js)$/", $this->mTextform )
+                       and !$wgUser->isSysop()
+                       and !preg_match("/^".preg_quote($wgUser->getName(), '/')."/", $this->mTextform) )
+               { return false; }
                $ur = $wgUser->getRights();
                foreach ( $this->getRestrictions() as $r ) {
                        if ( "" != $r && ( ! in_array( $r, $ur ) ) ) {
@@ -444,6 +520,39 @@ class Title {
                }
                return true;
        }
+       
+       function userCanRead() {
+               global $wgUser;
+               global $wgWhitelistRead;
+               
+               if( 0 != $wgUser->getID() ) return true;
+               if( !is_array( $wgWhitelistRead ) ) return true;
+               
+               $name = $this->getPrefixedText();
+               if( in_array( $name, $wgWhitelistRead ) ) return true;
+               
+               # Compatibility with old settings
+               if( $this->getNamespace() == NS_ARTICLE ) {
+                       if( in_array( ":" . $name, $wgWhitelistRead ) ) return true;
+               }
+               return false;
+       }
+       
+       function isCssJsSubpage() {
+               return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
+       }
+       function isCssSubpage() {
+               return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
+       }
+       function isJsSubpage() {
+               return ( Namespace::getUser() == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
+       }
+       function userCanEditCssJsSubpage() {
+               # protect css/js subpages of user pages
+               # XXX: this might be better using restrictions
+               global $wgUser;
+               return ( $wgUser->isSysop() or preg_match("/^".preg_quote($wgUser->getName())."/", $this->mTextform) );
+       }
 
        # Accessor/initialisation for mRestrictions
        function getRestrictions()
@@ -531,7 +640,7 @@ class Title {
        #
        /* private */ function secureAndSplit()
        {
-               global $wgLang, $wgLocalInterwiki;
+               global $wgLang, $wgLocalInterwiki, $wgCapitalLinks;
                $fname = "Title::secureAndSplit";
                wfProfileIn( $fname );
                
@@ -541,23 +650,18 @@ class Title {
                # Initialisation
                if ( $imgpre === false ) {
                        $imgpre = ":" . $wgLang->getNsText( Namespace::getImage() ) . ":";
+                       # % is needed as well
                        $rxTc = "/[^" . Title::legalChars() . "]/";
                }
 
-
                $this->mInterwiki = $this->mFragment = "";
-               $this->mNamespace = 0;
+               $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
 
                # Clean up whitespace
                #
                $t = preg_replace( "/[\\s_]+/", "_", $this->mDbkeyform );
-               if ( "_" == $t{0} ) { 
-                       $t = substr( $t, 1 ); 
-               }
-               $l = strlen( $t );
-               if ( $l && ( "_" == $t{$l-1} ) ) { 
-                       $t = substr( $t, 0, $l-1 ); 
-               }
+               $t = preg_replace( '/^_*(.*?)_*$/', '$1', $t );
+
                if ( "" == $t ) {
                        wfProfileOut( $fname );
                        return false;
@@ -571,15 +675,21 @@ class Title {
                        $t = substr( $t, 1 );
                }
 
-               # Redundant initial colon
+               # Initial colon indicating main namespace
                if ( ":" == $t{0} ) {
                        $r = substr( $t, 1 );
+                       $this->mNamespace = NS_MAIN;
                } else {
                        # Namespace or interwiki prefix
-                       if ( preg_match( "/^((?:i|x|[a-z]{2,3})(?:-[a-z0-9]+)?|[A-Za-z0-9_\\x80-\\xff]+):_*(.*)$/", $t, $m ) ) {
+                       if ( preg_match( "/^((?:i|x|[a-z]{2,3})(?:-[a-z0-9]+)?|[A-Za-z0-9_\\x80-\\xff]+?)_*:_*(.*)$/", $t, $m ) ) {
                                #$p = strtolower( $m[1] );
                                $p = $m[1];
-                               if ( $ns = $wgLang->getNsIndex( strtolower( $p ) )) {
+                               $lowerNs = strtolower( $p );
+                               if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
+                                       # Canonical namespace
+                                       $t = $m[2];
+                                       $this->mNamespace = $ns;
+                               } elseif ( $ns = $wgLang->getNsIndex( $lowerNs )) {
                                        # Ordinary namespace
                                        $t = $m[2];
                                        $this->mNamespace = $ns;
@@ -619,13 +729,15 @@ class Title {
                        return false;
                }
                
-               # "." and ".." conflict with the directories of those names
-               if ( $r === "." || $r === ".." ) {
+               # "." and ".." conflict with the directories of those namesa
+               if ( $r === "." || $r === ".." || strpos( $r, "./" ) !== false ) {
                        return false;
                }
 
                # Initial capital letter
-               if( $this->mInterwiki == "") $t = $wgLang->ucfirst( $r );
+               if( $wgCapitalLinks && $this->mInterwiki == "") {
+                       $t = $wgLang->ucfirst( $r );
+               }
                
                # Fill fields
                $this->mDbkeyform = $t;
@@ -646,5 +758,499 @@ class Title {
        function getSubjectPage() {
                return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
        }
+
+       # Get an array of Title objects linking to this title
+       # Also stores the IDs in the link cache
+       function getLinksTo() {
+               global $wgLinkCache;
+               $id = $this->getArticleID();
+               $sql = "SELECT cur_namespace,cur_title,cur_id FROM cur,links WHERE l_from=cur_id AND l_to={$id}";
+               $res = wfQuery( $sql, DB_READ, "Title::getLinksTo" );
+               $retVal = array();
+               if ( wfNumRows( $res ) ) {
+                       while ( $row = wfFetchObject( $res ) ) {
+                               if ( $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title ) ) {
+                                       $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
+                                       $retVal[] = $titleObj;
+                               }
+                       }
+               }
+               wfFreeResult( $res );
+               return $retVal;
+       }
+
+       # Get an array of Title objects linking to this non-existent title
+       # Also stores the IDs in the link cache
+       function getBrokenLinksTo() {
+               global $wgLinkCache;
+               $encTitle = wfStrencode( $this->getPrefixedDBkey() );
+               $sql = "SELECT cur_namespace,cur_title,cur_id FROM brokenlinks,cur " .
+                 "WHERE bl_from=cur_id AND bl_to='$encTitle'";
+               $res = wfQuery( $sql, DB_READ, "Title::getBrokenLinksTo" );
+               $retVal = array();
+               if ( wfNumRows( $res ) ) {
+                       while ( $row = wfFetchObject( $res ) ) {
+                               $titleObj = Title::makeTitle( $row->cur_namespace, $row->cur_title );
+                               $wgLinkCache->addGoodLink( $row->cur_id, $titleObj->getPrefixedDBkey() );
+                               $retVal[] = $titleObj;
+                       }
+               }
+               wfFreeResult( $res );
+               return $retVal;
+       }
+
+       function getSquidURLs() {
+               return array(
+                       $this->getInternalURL(),
+                       $this->getInternalURL( "action=history" )
+               );
+       }
+
+       function moveNoAuth( &$nt ) {
+               return $this->moveTo( $nt, false );
+       }
+       
+       # Move a title to a new location
+       # Returns true on success, message name on failure
+       # auth indicates whether wgUser's permissions should be checked
+       function moveTo( &$nt, $auth = true ) {
+               if( !$this or !$nt ) {
+                       return "badtitletext";
+               }
+
+               $fname = "Title::move";
+               $oldid = $this->getArticleID();
+               $newid = $nt->getArticleID();
+
+               if ( strlen( $nt->getDBkey() ) < 1 ) {
+                       return "articleexists";
+               }
+               if ( ( ! Namespace::isMovable( $this->getNamespace() ) ) ||
+                        ( "" == $this->getDBkey() ) ||
+                        ( "" != $this->getInterwiki() ) ||
+                        ( !$oldid ) ||
+                    ( ! Namespace::isMovable( $nt->getNamespace() ) ) ||
+                        ( "" == $nt->getDBkey() ) ||
+                        ( "" != $nt->getInterwiki() ) ) {
+                       return "badarticleerror";
+               }
+
+               if ( $auth && ( !$this->userCanEdit() || !$nt->userCanEdit() ) ) {
+                       return "protectedpage";
+               }
+               
+               # The move is allowed only if (1) the target doesn't exist, or
+               # (2) the target is a redirect to the source, and has no history
+               # (so we can undo bad moves right after they're done).
+
+               if ( 0 != $newid ) { # Target exists; check for validity
+                       if ( ! $this->isValidMoveTarget( $nt ) ) {
+                               return "articleexists";
+                       }
+                       $this->moveOverExistingRedirect( $nt );
+               } else { # Target didn't exist, do normal move.
+                       $this->moveToNewTitle( $nt, $newid );
+               }
+
+               # Update watchlists
+               
+               $oldnamespace = $this->getNamespace() & ~1;
+               $newnamespace = $nt->getNamespace() & ~1;
+               $oldtitle = $this->getDBkey();
+               $newtitle = $nt->getDBkey();
+
+               if( $oldnamespace != $newnamespace && $oldtitle != $newtitle ) {
+                       WatchedItem::duplicateEntries( $this, $nt );
+               }
+
+               # Update search engine
+               $u = new SearchUpdate( $oldid, $nt->getPrefixedDBkey() );
+               $u->doUpdate();
+               $u = new SearchUpdate( $newid, $this->getPrefixedDBkey(), "" );
+               $u->doUpdate();
+
+               return true;
+       }
+       
+       # Move page to title which is presently a redirect to the source page
+       
+       /* private */ function moveOverExistingRedirect( &$nt )
+       {
+               global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
+               $fname = "Title::moveOverExistingRedirect";
+               $comment = wfMsg( "1movedto2", $this->getPrefixedText(), $nt->getPrefixedText() );
+               
+        $now = wfTimestampNow();
+        $won = wfInvertTimestamp( $now );
+               $newid = $nt->getArticleID();
+               $oldid = $this->getArticleID();
+               
+               # Change the name of the target page:
+               wfUpdateArray( 
+                       /* table */ 'cur',
+                       /* SET */ array( 
+                               'cur_touched' => $now, 
+                               'cur_namespace' => $nt->getNamespace(),
+                               'cur_title' => $nt->getDBkey()
+                       ), 
+                       /* WHERE */ array( 'cur_id' => $oldid ),
+                       $fname
+               );
+               $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
+
+               # Repurpose the old redirect. We don't save it to history since
+               # by definition if we've got here it's rather uninteresting.
+               
+               $redirectText = $wgMwRedir->getSynonym( 0 ) . " [[" . $nt->getPrefixedText() . "]]\n";
+               wfUpdateArray( 
+                       /* table */ 'cur',
+                       /* SET */ array(
+                               'cur_touched' => $now,
+                               'cur_timestamp' => $now,
+                               'inverse_timestamp' => $won,
+                               'cur_namespace' => $this->getNamespace(),
+                               'cur_title' => $this->getDBkey(),
+                               'cur_text' => $wgMwRedir->getSynonym( 0 ) . " [[" . $nt->getPrefixedText() . "]]\n",
+                               'cur_comment' => $comment,
+                               'cur_user' => $wgUser->getID(),
+                               'cur_minor_edit' => 0,
+                               'cur_counter' => 0,
+                               'cur_restrictions' => '',
+                               'cur_user_text' => $wgUser->getName(),
+                               'cur_is_redirect' => 1,
+                               'cur_is_new' => 1
+                       ),
+                       /* WHERE */ array( 'cur_id' => $newid ),
+                       $fname
+               );
+               
+               $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
+
+               # Fix the redundant names for the past revisions of the target page.
+               # The redirect should have no old revisions.
+               wfUpdateArray(
+                       /* table */ 'old',
+                       /* SET */ array( 
+                               'old_namespace' => $nt->getNamespace(),
+                               'old_title' => $nt->getDBkey(),
+                       ),
+                       /* WHERE */ array( 
+                               'old_namespace' => $this->getNamespace(),
+                               'old_title' => $this->getDBkey(),
+                       ),
+                       $fname
+               );
+               
+               RecentChange::notifyMove( $now, $this, $nt, $wgUser, $comment );
+
+               # Swap links
+               
+               # Load titles and IDs
+               $linksToOld = $this->getLinksTo();
+               $linksToNew = $nt->getLinksTo();
+               
+               # Delete them all
+               $sql = "DELETE FROM links WHERE l_to=$oldid OR l_to=$newid";
+               wfQuery( $sql, DB_WRITE, $fname );
+
+               # Reinsert
+               if ( count( $linksToOld ) || count( $linksToNew )) {
+                       $sql = "INSERT INTO links (l_from,l_to) VALUES ";
+                       $first = true;
+
+                       # Insert links to old title
+                       foreach ( $linksToOld as $linkTitle ) {
+                               if ( $first ) {
+                                       $first = false;
+                               } else {
+                                       $sql .= ",";
+                               }
+                               $id = $linkTitle->getArticleID();
+                               $sql .= "($id,$newid)";
+                       }
+
+                       # Insert links to new title
+                       foreach ( $linksToNew as $linkTitle ) {
+                               if ( $first ) {
+                                       $first = false;
+                               } else {
+                                       $sql .= ",";
+                               }
+                               $id = $linkTitle->getArticleID();
+                               $sql .= "($id, $oldid)";
+                       }
+
+                       wfQuery( $sql, DB_WRITE, $fname );
+               }
+
+               # Now, we record the link from the redirect to the new title.
+               # It should have no other outgoing links...
+               $sql = "DELETE FROM links WHERE l_from={$newid}";
+               wfQuery( $sql, DB_WRITE, $fname );
+               $sql = "INSERT INTO links (l_from,l_to) VALUES ({$newid},{$oldid})";
+               wfQuery( $sql, DB_WRITE, $fname );
+               
+               # Clear linkscc
+               LinkCache::linksccClearLinksTo( $oldid );
+               LinkCache::linksccClearLinksTo( $newid );
+               
+               # Purge squid
+               if ( $wgUseSquid ) {
+                       $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
+                       $u = new SquidUpdate( $urls );
+                       $u->doUpdate();
+               }
+       }
+
+       # Move page to non-existing title.
+       # Sets $newid to be the new article ID
+
+       /* private */ function moveToNewTitle( &$nt, &$newid )
+       {
+               global $wgUser, $wgLinkCache, $wgUseSquid;
+               $fname = "MovePageForm::moveToNewTitle";
+               $comment = wfMsg( "1movedto2", $this->getPrefixedText(), $nt->getPrefixedText() );
+
+               $now = wfTimestampNow();
+               $won = wfInvertTimestamp( $now );
+               $newid = $nt->getArticleID();
+               $oldid = $this->getArticleID();
+
+               # Rename cur entry
+               wfUpdateArray(
+                       /* table */ 'cur',
+                       /* SET */ array(
+                               'cur_touched' => $now,
+                               'cur_namespace' => $nt->getNamespace(),
+                               'cur_title' => $nt->getDBkey()
+                       ),
+                       /* WHERE */ array( 'cur_id' => $oldid ),
+                       $fname
+               );
+               
+               $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
+
+               # Insert redirct
+               wfInsertArray( 'cur', array(
+                       'cur_namespace' => $this->getNamespace(),
+                       'cur_title' => $this->getDBkey(),
+                       'cur_comment' => $comment,
+                       'cur_user' => $wgUser->getID(),
+                       'cur_user_text' => $wgUser->getName(),
+                       'cur_timestamp' => $now,
+                       'inverse_timestamp' => $won,
+                       'cur_touched' => $now,
+                       'cur_is_redirect' => 1,
+                       'cur_is_new' => 1,
+                       'cur_text' => "#REDIRECT [[" . $nt->getPrefixedText() . "]]\n" )
+               );
+               $newid = wfInsertId();
+               $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
+
+               # Rename old entries
+               wfUpdateArray( 
+                       /* table */ 'old',
+                       /* SET */ array(
+                               'old_namespace' => $nt->getNamespace(),
+                               'old_title' => $nt->getDBkey()
+                       ),
+                       /* WHERE */ array(
+                               'old_namespace' => $this->getNamespace(),
+                               'old_title' => $this->getDBkey()
+                       ), $fname
+               );
+               
+               # Record in RC
+               RecentChange::notifyMove( $now, $this, $nt, $wgUser, $comment );
+
+               # Purge squid and linkscc as per article creation
+               Article::onArticleCreate( $nt );
+
+               # Any text links to the old title must be reassigned to the redirect
+               $sql = "UPDATE links SET l_to={$newid} WHERE l_to={$oldid}";
+               wfQuery( $sql, DB_WRITE, $fname );
+               LinkCache::linksccClearLinksTo( $oldid );
+
+               # Record the just-created redirect's linking to the page
+               $sql = "INSERT INTO links (l_from,l_to) VALUES ({$newid},{$oldid})";
+               wfQuery( $sql, DB_WRITE, $fname );
+
+               # Non-existent target may have had broken links to it; these must
+               # now be removed and made into good links.
+               $update = new LinksUpdate( $oldid, $nt->getPrefixedDBkey() );
+               $update->fixBrokenLinks();
+
+               # Purge old title from squid
+               # The new title, and links to the new title, are purged in Article::onArticleCreate()
+               $titles = $nt->getLinksTo();
+               if ( $wgUseSquid ) {
+                       $urls = $this->getSquidURLs();
+                       foreach ( $titles as $linkTitle ) {
+                               $urls[] = $linkTitle->getInternalURL();
+                       }
+                       $u = new SquidUpdate( $urls );
+                       $u->doUpdate();
+               }
+       }
+
+       # Checks if $this can be moved to $nt
+       # Both titles must exist in the database, otherwise it will blow up
+       function isValidMoveTarget( $nt )
+       {
+               $fname = "Title::isValidMoveTarget";
+
+               # Is it a redirect?
+               $id  = $nt->getArticleID();
+               $sql = "SELECT cur_is_redirect,cur_text FROM cur " .
+                 "WHERE cur_id={$id}";
+               $res = wfQuery( $sql, DB_READ, $fname );
+               $obj = wfFetchObject( $res );
+
+               if ( 0 == $obj->cur_is_redirect ) { 
+                       # Not a redirect
+                       return false; 
+               }
+
+               # Does the redirect point to the source?
+               if ( preg_match( "/\\[\\[\\s*([^\\]]*)]]/", $obj->cur_text, $m ) ) {
+                       $redirTitle = Title::newFromText( $m[1] );
+                       if ( 0 != strcmp( $redirTitle->getPrefixedDBkey(), $this->getPrefixedDBkey() ) ) {
+                               return false;
+                       }
+               }
+
+               # Does the article have a history?
+               $row = wfGetArray( 'old', array( 'old_id' ), array( 
+                       'old_namespace' => $nt->getNamespace(),
+                       'old_title' => $nt->getDBkey() )
+               );
+
+               # Return true if there was no history
+               return $row === false;
+       }
+       
+       # Create a redirect, fails if the title already exists, does not notify RC
+       # Returns success
+       function createRedirect( $dest, $comment ) {
+               global $wgUser;
+               if ( $this->getArticleID() ) {
+                       return false;
+               }
+               
+               $now = wfTimestampNow();
+               $won = wfInvertTimestamp( $now );
+
+               wfInsertArray( 'cur', array(
+                       'cur_namespace' => $this->getNamespace(),
+                       'cur_title' => $this->getDBkey(),
+                       'cur_comment' => $comment,
+                       'cur_user' => $wgUser->getID(),
+                       'cur_user_text' => $wgUser->getName(),
+                       'cur_timestamp' => $now,
+                       'inverse_timestamp' => $won,
+                       'cur_touched' => $now,
+                       'cur_is_redirect' => 1,
+                       'cur_is_new' => 1,
+                       'cur_text' => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n" 
+               ));
+               $newid = wfInsertId();
+               $this->resetArticleID( $newid );
+               
+               # Link table
+               if ( $dest->getArticleID() ) {
+                       wfInsertArray( 'links', array(
+                               'l_to' => $dest->getArticleID(),
+                               'l_from' => $newid
+                       ));
+               } else {
+                       wfInsertArray( 'brokenlinks', array( 
+                               'bl_to' => $dest->getPrefixedDBkey(),
+                               'bl_from' => $newid
+                       ));
+               }
+
+               Article::onArticleCreate( $this );
+               return true;
+       }
+       
+       # Get categories to wich belong this title and return an array of
+       # categories names.
+       function getParentCategories( )
+       {
+               global $wgLang,$wgUser;
+               
+               #$titlekey = wfStrencode( $this->getArticleID() );
+               $titlekey = $this->getArticleId();
+               $cns = Namespace::getCategory();
+               $sk =& $wgUser->getSkin();
+               $parents = array();
+               
+               # get the parents categories of this title from the database
+               $sql = "SELECT DISTINCT cur_id FROM cur,categorylinks
+                       WHERE cl_from='$titlekey' AND cl_to=cur_title AND cur_namespace='$cns'
+                               ORDER BY cl_sortkey" ;
+               $res = wfQuery ( $sql, DB_READ ) ;
+               
+               if(wfNumRows($res) > 0) {
+                       while ( $x = wfFetchObject ( $res ) ) $data[] = $x ;
+                       wfFreeResult ( $res ) ;
+               } else {
+                       $data = '';
+               }
+               return $data;
+       }
+       
+       # will get the parents and grand-parents
+       # TODO : not sure what's happening when a loop happen like:
+       #       Encyclopedia > Astronomy > Encyclopedia
+       function getAllParentCategories(&$stack)
+       {
+               global $wgUser,$wgLang;
+               $result = '';
+               
+               # getting parents
+               $parents = $this->getParentCategories( );
+
+               if($parents == '')
+               {
+                       # The current element has no more parent so we dump the stack
+                       # and make a clean line of categories
+                       $sk =& $wgUser->getSkin() ;
+
+                       foreach ( array_reverse($stack) as $child => $parent )
+                       {
+                               # make a link of that parent
+                               $result .= $sk->makeLink($wgLang->getNSText ( Namespace::getCategory() ).":".$parent,$parent);
+                               $result .= ' &gt; ';
+                               $lastchild = $child;
+                       }
+                       # append the last child.
+                       # TODO : We should have a last child unless there is an error in the
+                       # "categorylinks" table.
+                       if(isset($lastchild)) { $result .= $lastchild; }
+                       
+                       $result .= "<br/>\n";
+                       
+                       # now we can empty the stack
+                       $stack = array();
+                       
+               } else {
+                       # look at parents of current category
+                       foreach($parents as $parent)
+                       {
+                               # create a title object for the parent
+                               $tpar = Title::newFromID($parent->cur_id);
+                               # add it to the stack
+                               $stack[$this->getText()] = $tpar->getText();
+                               # grab its parents
+                               $result .= $tpar->getAllParentCategories($stack);
+                       }
+               }
+
+               if(isset($result)) { return $result; }
+               else { return ''; };
+       }
+       
+       
 }
 ?>