Migrate doubleredirect and brokenredirect subpages from SpecialMaintenance.php to...
[lhc/web/wiklou.git] / includes / SearchEngine.php
index 0cdbf54..94162cf 100644 (file)
@@ -1,30 +1,38 @@
 <?php
 # See search.doc
 
+define( "MW_SEARCH_OK", true );
+define( "MW_SEARCH_BAD_QUERY", false );
+
 class SearchEngine {
-       /* private */ var $mUsertext, $mSearchterms;
-       /* private */ var $mTitlecond, $mTextcond;
+       /* private */ var $rawText, $filteredText, $searchTerms;
+       /* private */ var $titleCond, $textCond;
 
        var $doSearchRedirects = true;
-       var $addtoquery = array();
+       var $addToQuery = array();
        var $namespacesToSearch = array();
        var $alternateTitle;
-       var $all_titles = false;
+       var $allTitles = false;
+
+       function SearchEngine( $text ) {
+               $this->rawText = trim( $text );
 
-       function SearchEngine( $text )
-       {
                # We display the query, so let's strip it for safety
                #
                global $wgDBmysql4;
                $lc = SearchEngine::legalSearchChars() . "()";
-               if( $wgDBmysql4 ) $lc .= "\"~<>*+-";
-               $this->mUsertext = trim( preg_replace( "/[^{$lc}]/", " ", $text ) );
-               $this->mSearchterms = array();
-               $this->mStrictMatching = true; # Google-style, add '+' on all terms
+               if( $wgDBmysql4 ) {
+                       $lc .= "\"~<>*+-";
+               }
+               $this->filteredText = trim( preg_replace( "/[^{$lc}]/", " ", $text ) );
+               $this->searchTerms = array();
+               $this->strictMatching = true; # Google-style, add '+' on all terms
+
+               $this->db =& wfGetDB( DB_SLAVE );
        }
 
-       function queryNamespaces()
-       {
+       # Return a partial WHERE clause to limit the search to the given namespaces
+       function queryNamespaces() {
                $namespaces = implode( ",", $this->namespacesToSearch );
                if ($namespaces == "") {
                        $namespaces = "0";
@@ -32,8 +40,8 @@ class SearchEngine {
                return "AND cur_namespace IN (" . $namespaces . ")";
        }
 
-       function searchRedirects()
-       {
+       # Return a partial WHERE clause to include or exclude redirects from results
+       function searchRedirects() {
                if ( $this->doSearchRedirects ) {
                        return "";
                } else {
@@ -56,12 +64,11 @@ class SearchEngine {
 
        # Display the "power search" footer. Does not actually perform the search, 
        # that is done by showResults()
-       function powersearch()
-       {
+       function powersearch() {
                global $wgUser, $wgOut, $wgLang, $wgTitle, $wgRequest;
                $sk =& $wgUser->getSkin();
                
-               $search                 = $wgRequest->getText( 'search' );
+               $search                 = $this->rawText;
                $searchx                = $wgRequest->getVal( 'searchx' );
                $listredirs             = $wgRequest->getVal( 'redirs' );
                
@@ -69,7 +76,7 @@ class SearchEngine {
                $tempText = ""; # Temporary text, for substitution into $ret    
 
                if( isset( $_REQUEST["searchx"] ) ) {
-                       $this->addtoquery["searchx"] = "1";
+                       $this->addToQuery["searchx"] = "1";
                }
                
                # Do namespace checkboxes
@@ -93,7 +100,7 @@ class SearchEngine {
                        $checked = "";
                        if ( $checkboxValue == 1 ) {
                                $checked = " checked='checked'";
-                               $this->addtoquery["ns{$i}"] = 1;
+                               $this->addToQuery["ns{$i}"] = 1;
                                array_push( $this->namespacesToSearch, $i );
                        }
                        $name = str_replace( "_", " ", $namespaces[$i] );
@@ -113,7 +120,7 @@ class SearchEngine {
 
                $checked = "";
                if ( $listredirs == 1 ) {
-                       $this->addtoquery["redirs"] = 1;
+                       $this->addToQuery["redirs"] = 1;
                        $checked = " checked='checked'";
                }
                $tempText = "<input type='checkbox' value='1' name=\"redirs\"{$checked} />\n";
@@ -146,163 +153,102 @@ class SearchEngine {
        function setupPage() {
                global $wgOut;
                $wgOut->setPageTitle( wfMsg( "searchresults" ) );
-               $q = wfMsg( "searchquery", htmlspecialchars( $this->mUsertext ) );
-               $wgOut->setSubtitle( $q );
+               $wgOut->setSubtitle( wfMsg( "searchquery", htmlspecialchars( $this->rawText ) ) );
                $wgOut->setArticleRelated( false );
                $wgOut->setRobotpolicy( "noindex,nofollow" );
        }
 
        # Perform the search and construct the results page
-       function showResults()
-       {
-               global $wgUser, $wgTitle, $wgOut, $wgLang, $wgRequest;
+       function showResults() {
+               global $wgUser, $wgTitle, $wgOut, $wgLang;
                global $wgDisableTextSearch, $wgInputEncoding;
                $fname = "SearchEngine::showResults";
 
-               $search = $wgRequest->getText( 'search' );
+               $search = $this->rawText;
 
                $powersearch = $this->powersearch(); /* Need side-effects here? */
 
                $this->setupPage();
-               
+
                $sk = $wgUser->getSkin();
-               $header = wfMsg( "searchresulttext", $sk->makeKnownLink(
-                 wfMsg( "searchhelppage" ), wfMsg( "searchingwikipedia" ) ) );
-               $wgOut->addHTML( $header );
-
-               $this->parseQuery();
-               if ( "" == $this->mTitlecond || "" == $this->mTextcond ) {
-                       $wgOut->addHTML( "<h2>" . wfMsg( "badquery" ) . "</h2>\n" .
-                         "<p>" . wfMsg( "badquerytext" ) . "</p>\n" );
+               $wgOut->addWikiText( wfMsg( "searchresulttext" ) );
+
+               if ( !$this->parseQuery() ) {
+                       $wgOut->addWikiText(
+                               "==" . wfMsg( "badquery" ) . "==\n" .
+                               wfMsg( "badquerytext" ) );
                        return;
                }
                list( $limit, $offset ) = wfCheckLimits( 20, "searchlimit" );
-
-               $searchnamespaces = $this->queryNamespaces();
-               $redircond = $this->searchRedirects();
-
+               
                if ( $wgDisableTextSearch ) {
                        $wgOut->addHTML( wfMsg( "searchdisabled" ) );
-                       $wgOut->addHTML( wfMsg( "googlesearch", htmlspecialchars( $search ), $GLOBALS['wgInputEncoding'] ) );
+                       $wgOut->addHTML( wfMsg( "googlesearch",
+                               htmlspecialchars( $this->rawText ),
+                               htmlspecialchars( $wgInputEncoding ) ) );
+                       return;
+               }
+
+               $titleMatches = $this->getMatches( $this->titleCond, $limit, $offset );
+               $textMatches = $this->getMatches( $this->textCond, $limit, $offset );
+
+               $sk = $wgUser->getSkin();
+               
+               $num = count( $titleMatches ) + count( $textMatches );
+               if ( $num >= $limit ) {
+                       $top = wfShowingResults( $offset, $limit );
                } else {
-                       $sql = "SELECT cur_id,cur_namespace,cur_title," .
-                         "cur_text FROM cur,searchindex " .
-                         "WHERE cur_id=si_page AND {$this->mTitlecond} " .
-                         "{$searchnamespaces} {$redircond}" .
-                         "LIMIT {$offset}, {$limit}";
-                       $res1 = wfQuery( $sql, DB_READ, $fname );
-                       $num = wfNumRows($res1);
-
-                       $sk = $wgUser->getSkin();
-                       $text = "";
-
-                       $this->parseQuery();
-                       if ( "" == $this->mTitlecond || "" == $this->mTextcond ) {
-                               $wgOut->addHTML( "<h2>" . wfMsg( "badquery" ) . "</h2>\n" .
-                                 "<p>" . wfMsg( "badquerytext" ) . "</p>\n" );
-                               return;
-                       }
-                       list( $limit, $offset ) = wfCheckLimits( 20, "searchlimit" );
-       
-                       $searchnamespaces = $this->queryNamespaces();
-                       $redircond = $this->searchRedirects();
-       
-                       $sql = "SELECT cur_id,cur_namespace,cur_title," .
-                         "cur_text FROM cur,searchindex " .
-                         "WHERE cur_id=si_page AND {$this->mTitlecond} " .
-                         "{$searchnamespaces} {$redircond}" .
-                         "LIMIT {$offset}, {$limit}";
-                       $res1 = wfQuery( $sql, DB_READ, $fname );
-                       $num = wfNumRows($res1);
-       
-                       $sql = "SELECT cur_id,cur_namespace,cur_title," .
-                         "cur_text FROM cur,searchindex " .
-                         "WHERE cur_id=si_page AND {$this->mTextcond} " .
-                         "{$searchnamespaces} {$redircond} " .
-                         "LIMIT {$offset}, {$limit}";
-                       $res2 = wfQuery( $sql, DB_READ, $fname );
-                       $num = $num + wfNumRows($res2);
-
-                       if ( $num == $limit ) {
-                         $top = wfShowingResults( $offset, $limit);
-                       } else {
-                         $top = wfShowingResultsNum( $offset, $limit, $num );
-                       }
-                       $wgOut->addHTML( "<p>{$top}</p>\n" );
-       
-                       # For powersearch
-       
-                       $a2l = "" ;
-                       $akk = array_keys( $this->addtoquery ) ;
-                       foreach ( $akk AS $ak ) {
-                               $a2l .= "&{$ak}={$this->addtoquery[$ak]}" ;
-                       }
-       
-                       $sl = wfViewPrevNext( $offset, $limit, "",
-                         "search=" . wfUrlencode( $this->mUsertext ) . $a2l );
-                       $wgOut->addHTML( "<br />{$sl}\n" );
-       
-                       $foundsome = false;
-       
-                       if ( 0 == wfNumRows( $res1 ) ) {
-                               $wgOut->addHTML( "<h2>" . wfMsg( "notitlematches" ) .
-                                 "</h2>\n" );
-                       } else {
-                               $foundsome = true;
-                               $off = $offset + 1;
-                               $wgOut->addHTML( "<h2>" . wfMsg( "titlematches" ) .
-                                 "</h2>\n<ol start='{$off}'>" );
-       
-                               while ( $row = wfFetchObject( $res1 ) ) {
-                                       $this->showHit( $row );
-                               }
-                               wfFreeResult( $res1 );
-                               $wgOut->addHTML( "</ol>\n" );
-                       }
+                       $top = wfShowingResultsNum( $offset, $limit, $num );
+               }
+               $wgOut->addHTML( "<p>{$top}</p>\n" );
 
-                       if ( 0 == wfNumRows( $res2 ) ) {
-                               $wgOut->addHTML( "<h2>" . wfMsg( "notextmatches" ) .
-                                 "</h2>\n" );
-                       } else {
-                               $foundsome = true;
-                               $off = $offset + 1;
-                               $wgOut->addHTML( "<h2>" . wfMsg( "textmatches" ) . "</h2>\n" .
-                                 "<ol start='{$off}'>" );
-                               while ( $row = wfFetchObject( $res2 ) ) {
-                                       $this->showHit( $row );
-                               }
-                               wfFreeResult( $res2 );
-                               $wgOut->addHTML( "</ol>\n" );
-                       }
-                       if ( ! $foundsome ) {
-                               $wgOut->addHTML( "<p>" . wfMsg( "nonefound" ) . "</p>\n" );
-                       }
-                       $wgOut->addHTML( "<p>{$sl}</p>\n" );
-                       $wgOut->addHTML( $powersearch );
+               # For powersearch
+               $a2l = "";
+               $akk = array_keys( $this->addToQuery );
+               foreach ( $akk AS $ak ) {
+                       $a2l .= "&{$ak}={$this->addToQuery[$ak]}" ;
+               }
+
+               $prevnext = wfViewPrevNext( $offset, $limit, "",
+                 "search=" . wfUrlencode( $this->filteredText ) . $a2l );
+               $wgOut->addHTML( "<br />{$prevnext}\n" );
+
+               $foundsome = $this->showMatches( $titleMatches, $offset, "notitlematches", "titlematches" )
+                                 || $this->showMatches( $textMatches,  $offset, "notextmatches",  "textmatches"  );
+               
+               if ( !$foundsome ) {
+                       $wgOut->addWikiText( wfMsg( "nonefound" ) );
                }
+               $wgOut->addHTML( "<p>{$prevnext}</p>\n" );
+               $wgOut->addHTML( $powersearch );
        }
 
-       function legalSearchChars()
-       {
+       function legalSearchChars() {
                $lc = "A-Za-z_'0-9\\x80-\\xFF\\-";
                return $lc;
        }
 
-       function parseQuery()
-       {
-               global $wgDBminWordLen, $wgLang, $wgDBmysql4;
-
+       function parseQuery() {
+               global $wgDBmysql4;
                if( $wgDBmysql4 ) {
                        # Use cleaner boolean search if available
                        return $this->parseQuery4();
+               } else {
+                       # Fall back to ugly hack with multiple search clauses
+                       return $this->parseQuery3();
                }
+       }
+       
+       function parseQuery3() {
+               global $wgDBminWordLen, $wgLang;
+
                # on non mysql4 database: get list of words we don't want to search for
                require_once( "FulltextStoplist.php" );
 
                $lc = SearchEngine::legalSearchChars() . "()";
-               $q = preg_replace( "/([()])/", " \\1 ", $this->mUsertext );
+               $q = preg_replace( "/([()])/", " \\1 ", $this->filteredText );
                $q = preg_replace( "/\\s+/", " ", $q );
-               $w = explode( " ", strtolower( trim( $q ) ) );
+               $w = explode( " ", trim( $q ) );
 
                $last = $cond = "";
                foreach ( $w as $word ) {
@@ -318,33 +264,36 @@ class SearchEngine {
                        } else {
                                if ( "" != $last ) { $cond .= " AND"; }
                                $cond .= " (MATCH (##field##) AGAINST ('" .
-                                 wfStrencode( $word ). "'))";
+                                 $this->db->strencode( $word ). "'))";
                                $last = $word;
-                               array_push( $this->mSearchterms, "\\b" . $word . "\\b" );
+                               array_push( $this->searchTerms, "\\b" . $word . "\\b" );
                        }
                }
-               if ( 0 == count( $this->mSearchterms ) ) { return; }
+               if ( 0 == count( $this->searchTerms ) ) {
+                       return MW_SEARCH_BAD_QUERY;
+               }
 
-               $this->mTitlecond = "(" . str_replace( "##field##",
+               $this->titleCond = "(" . str_replace( "##field##",
                  "si_title", $cond ) . " )";
 
-               $this->mTextcond = "(" . str_replace( "##field##",
+               $this->textCond = "(" . str_replace( "##field##",
                  "si_text", $cond ) . " AND (cur_is_redirect=0) )";
+               
+               return MW_SEARCH_OK;
        }
        
-       function parseQuery4()
-       {
+       function parseQuery4() {
                global $wgLang;
                $lc = SearchEngine::legalSearchChars();
                $searchon = "";
-               $this->mSearchterms = array();
+               $this->searchTerms = array();
 
                # FIXME: This doesn't handle parenthetical expressions.
                if( preg_match_all( '/([-+<>~]?)(([' . $lc . ']+)(\*?)|"[^"]*")/',
-                         $this->mUsertext, $m, PREG_SET_ORDER ) ) {
+                         $this->filteredText, $m, PREG_SET_ORDER ) ) {
                        foreach( $m as $terms ) {
                                if( $searchon !== "" ) $searchon .= " ";
-                               if( $this->mStrictMatching && ($terms[1] == "") ) {
+                               if( $this->strictMatching && ($terms[1] == "") ) {
                                        $terms[1] = "+";
                                }
                                $searchon .= $terms[1] . $wgLang->stripForSearch( $terms[2] );
@@ -354,24 +303,69 @@ class SearchEngine {
                                } else {
                                        $regexp = preg_quote( str_replace( '"', '', $terms[2] ) );
                                }
-                               $this->mSearchterms[] = $regexp;
+                               $this->searchTerms[] = $regexp;
                        }
                        wfDebug( "Would search with '$searchon'\n" );
-                       wfDebug( "Match with /\b" . implode( '\b|\b', $this->mSearchterms ) . "\b/\n" );
+                       wfDebug( "Match with /\b" . implode( '\b|\b', $this->searchTerms ) . "\b/\n" );
                } else {
-                       wfDebug( "Can't understand search query '$this->mUsertext'\n" );
+                       wfDebug( "Can't understand search query '{$this->filteredText}'\n" );
                }
                
-               $searchon = wfStrencode( $searchon );
-               $this->mTitlecond = " MATCH(si_title) AGAINST('$searchon' IN BOOLEAN MODE)";
-               $this->mTextcond = " (MATCH(si_text) AGAINST('$searchon' IN BOOLEAN MODE) AND cur_is_redirect=0)";
+               $searchon = $this->db->strencode( $searchon );
+               $this->titleCond = " MATCH(si_title) AGAINST('$searchon' IN BOOLEAN MODE)";
+               $this->textCond = " (MATCH(si_text) AGAINST('$searchon' IN BOOLEAN MODE) AND cur_is_redirect=0)";
+               return MW_SEARCH_OK;
        }
 
-       function showHit( $row )
-       {
-               global $wgUser, $wgOut;
+       function &getMatches( $cond, $limit, $offset = 0 ) {
+               $searchindex = $this->db->tableName( 'searchindex' );
+               $cur = $this->db->tableName( 'cur' );
+               $searchnamespaces = $this->queryNamespaces();
+               $redircond = $this->searchRedirects();
+               
+               $sql = "SELECT cur_id,cur_namespace,cur_title," .
+                 "cur_text FROM $cur,$searchindex " .
+                 "WHERE cur_id=si_page AND {$cond} " .
+                 "{$searchnamespaces} {$redircond} " .
+                 $this->db->limitResult( $limit, $offset );
+               
+               $res = $this->db->query( $sql, "SearchEngine::getMatches" );
+               $matches = array();
+               while ( $row = $this->db->fetchObject( $res ) ) {
+                       $matches[] = $row;
+               }
+               $this->db->freeResult( $res );
+               
+               return $matches;
+       }
+
+       function showMatches( &$matches, $offset, $msgEmpty, $msgFound ) {
+               global $wgOut;
+               if ( 0 == count( $matches ) ) {
+                       $wgOut->addHTML( "<h2>" . wfMsg( $msgEmpty ) .
+                         "</h2>\n" );
+                       return false;
+               } else {
+                       $off = $offset + 1;
+                       $wgOut->addHTML( "<h2>" . wfMsg( $msgFound ) .
+                         "</h2>\n<ol start='{$off}'>" );
+
+                       foreach( $matches as $row ) {
+                               $this->showHit( $row );
+                       }
+                       $wgOut->addHTML( "</ol>\n" );
+                       return true;
+               }
+       }
+
+       function showHit( $row ) {
+               global $wgUser, $wgOut, $wgLang;
 
                $t = Title::makeName( $row->cur_namespace, $row->cur_title );
+               if( is_null( $t ) ) {
+                       $wgOut->addHTML( "<!-- Broken link in search result -->\n" );
+                       return;
+               }
                $sk = $wgUser->getSkin();
 
                $contextlines = $wgUser->getOption( "contextlines" );
@@ -384,118 +378,120 @@ class SearchEngine {
                $wgOut->addHTML( "<li>{$link} ({$size})" );
 
                $lines = explode( "\n", $row->cur_text );
-               $pat1 = "/(.*)(" . implode( "|", $this->mSearchterms ) . ")(.*)/i";
+               $pat1 = "/(.*)(" . implode( "|", $this->searchTerms ) . ")(.*)/i";
                $lineno = 0;
 
                foreach ( $lines as $line ) {
-                       if ( 0 == $contextlines ) { break; }
+                       if ( 0 == $contextlines ) {
+                               break;
+                       }
                        --$contextlines;
                        ++$lineno;
-                       if ( ! preg_match( $pat1, $line, $m ) ) { continue; }
-
-                       $pre = $m[1];
-                       if ( 0 == $contextchars ) { $pre = "..."; }
-                       else {
-                               if ( strlen( $pre ) > $contextchars ) {
-                                       $pre = "..." . substr( $pre, -$contextchars );
-                               }
+                       if ( ! preg_match( $pat1, $line, $m ) ) {
+                               continue;
                        }
-                       $pre = wfEscapeHTML( $pre );
 
-                       if ( count( $m ) < 3 ) { $post = ""; }
-                       else { $post = $m[3]; }
+                       $pre = $wgLang->truncate( $m[1], -$contextchars, "..." );
 
-                       if ( 0 == $contextchars ) { $post = "..."; }
-                       else {
-                               if ( strlen( $post ) > $contextchars ) {
-                                       $post = substr( $post, 0, $contextchars ) . "...";
-                               }
+                       if ( count( $m ) < 3 ) {
+                               $post = "";
+                       } else {
+                               $post = $wgLang->truncate( $m[3], $contextchars, "..." );
                        }
-                       $post = wfEscapeHTML( $post );
-                       $found = wfEscapeHTML( $m[2] );
 
-                       $line = "{$pre}{$found}{$post}";
-                       $pat2 = "/(" . implode( "|", $this->mSearchterms ) . ")/i";
+                       $found = $m[2];
+
+                       $line = htmlspecialchars( $pre . $found . $post );
+                       $pat2 = "/(" . implode( "|", $this->searchTerms ) . ")/i";
                        $line = preg_replace( $pat2,
-                         "<font color='red'>\\1</font>", $line );
+                         "<span class='searchmatch'>\\1</span>", $line );
 
                        $wgOut->addHTML( "<br /><small>{$lineno}: {$line}</small>\n" );
                }
                $wgOut->addHTML( "</li>\n" );
        }
 
-       function goResult()
-       {
-               global $wgOut, $wgRequest, $wgGoToEdit;
-               global $wgDisableTextSearch;
-               $fname = "SearchEngine::goResult";
-               
-               $search = trim( $wgRequest->getText( "search" ) );
-
-               # Try to go to page as entered.
-               #
-               $t = Title::newFromText( $search );
-
-               # If the string cannot be used to create a title
-               if( false == $t ){ 
-                       $this->showResults();
-                       return;
-               }
-
+       function getNearMatch() {
                # Exact match? No need to look further.
-               if ( $t->getNamespace() == NS_SPECIAL || 0 != $t->getArticleID() ) {
-                       $wgOut->redirect( $t->getFullURL() );
-                       return;
+               $title = Title::newFromText( $this->rawText );
+               if ( $title->getNamespace() == NS_SPECIAL || 0 != $title->getArticleID() ) {
+                       return $title;
                }
 
                # Now try all lower case (i.e. first letter capitalized)
                #
-               $t = Title::newFromText( strtolower( $search ) );
-               if ( 0 != $t->getArticleID() ) {
-                       $wgOut->redirect( $t->getFullURL() );
-                       return;
+               $title = Title::newFromText( strtolower( $this->rawText ) );
+               if ( 0 != $title->getArticleID() ) {
+                       return $title;
                }
 
                # Now try capitalized string
                #
-               $t = Title::newFromText( ucwords( strtolower( $search ) ) );
-               if ( 0 != $t->getArticleID() ) {
-                       $wgOut->redirect( $t->getFullURL() );
-                       return;
+               $title = Title::newFromText( ucwords( strtolower( $this->rawText ) ) );
+               if ( 0 != $title->getArticleID() ) {
+                       return $title;
                }
 
                # Now try all upper case
                #
-               $t = Title::newFromText( strtoupper( $search ) );
-               if ( 0 != $t->getArticleID() ) {
-                       $wgOut->redirect( $t->getFullURL() );
-                       return;
+               $title = Title::newFromText( strtoupper( $this->rawText ) );
+               if ( 0 != $title->getArticleID() ) {
+                       return $title;
                }
 
                # Entering an IP address goes to the contributions page
-               if ( preg_match( '/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/', $search ) ) {
-                       $title = Title::makeTitle( NS_SPECIAL, "Contributions" );
-                       $wgOut->redirect( $title->getFullUrl( "target=$search" ) );
+               if ( preg_match( '/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/', $this->rawText ) ) {
+                       $title = Title::makeTitle( NS_SPECIAL, "Contributions/" . $this->rawText );
+                       return $title;
+               }
+               
+               return NULL;
+       }
+
+       function goResult() {
+               global $wgOut, $wgGoToEdit;
+               global $wgDisableTextSearch;
+               $fname = "SearchEngine::goResult";
+               
+               # Try to go to page as entered.
+               #
+               $t = Title::newFromText( $this->rawText );
+
+               # If the string cannot be used to create a title
+               if( is_null( $t ) ){ 
+                       $this->showResults();
                        return;
                }
 
+               # If there's an exact or very near match, jump right there.
+               $t = $this->getNearMatch();
+               if( !is_null( $t ) ) {
+                       $wgOut->redirect( $t->getFullURL() );
+                       return;
+               }
+               
                # No match, generate an edit URL
-               $t = Title::newFromText( $this->mUsertext );
+               $t = Title::newFromText( $this->rawText );
                
                # If the feature is enabled, go straight to the edit page
                if ( $wgGoToEdit ) {
                        $wgOut->redirect( $t->getFullURL( "action=edit" ) );
                        return;
                }
-
-               $wgOut->addHTML( "<p>" . wfMsg("nogomatch", $t->escapeLocalURL( "action=edit" ) ) . "</p>\n" );
+               
+               if( $t ) {
+                       $editurl = $t->escapeLocalURL( "action=edit" );
+               } else {
+                       $editurl = ""; # ?? 
+               }
+               $wgOut->addHTML( "<p>" . wfMsg("nogomatch", $editurl ) . "</p>\n" );
 
                # Try a fuzzy title search
                $anyhit = false;
                global $wgDisableFuzzySearch;
                if(! $wgDisableFuzzySearch ){
                        foreach( array(NS_MAIN, NS_WP, NS_USER, NS_IMAGE, NS_MEDIAWIKI) as $namespace){
-                               $anyhit |= SearchEngine::doFuzzyTitleSearch( $search, $namespace );
+                               $anyhit |= SearchEngine::doFuzzyTitleSearch( $this->rawText, $namespace );
                        }
                }
                
@@ -562,11 +558,12 @@ class SearchEngine {
 
        /* static */ function getTitlesByLength($aLength, $aNamespace = 0){
                global $wgMemc, $wgDBname;
-
+               $fname = 'SearchEngin::getTitlesByLength';
+               
                // to avoid multiple costly SELECTs in case of no memcached
-               if( $this->all_titles ){ 
-                       if( isset( $this->all_titles[$aLength][$aNamespace] ) ){
-                               return $this->all_titles[$aLength][$aNamespace];
+               if( $this->allTitles ){ 
+                       if( isset( $this->allTitles[$aLength][$aNamespace] ) ){
+                               return $this->allTitles[$aLength][$aNamespace];
                        } else {
                                return array();
                        }
@@ -584,10 +581,10 @@ class SearchEngine {
                }
 
                $wgMemc->set( $mkeyts, time() );
-
-               $res = wfQuery("SELECT cur_title, cur_namespace FROM cur", DB_READ);
+               
+               $res = $this->db->select( 'cur', array( 'cur_title', 'cur_namespace' ), false, $fname );
                $titles = array(); // length, ns, [titles]
-               while( $obj = wfFetchObject( $res ) ){
+               while( $obj = $this->db->fetchObject( $res ) ){
                        $title = $obj->cur_title;
                        $ns = $obj->cur_namespace;
                        $len = strlen( $title );
@@ -599,7 +596,7 @@ class SearchEngine {
                                $wgMemc->set( $mkey, $title_arr, 3600 * 24 );
                        }
                }
-               $this->all_titles = $titles;
+               $this->allTitles = $titles;
                if( isset( $titles[$aLength][$aNamespace] ) )
                        return $titles[$aLength][$aNamespace];
                else