updated to MediaWiki 1.14.0

1 files changed, 379 insertions, 338 deletions

diff --git a/includes/specials/SpecialAllpages.php b/includes/specials/SpecialAllpages.php
index 7223e317..bf68dfa6 100644
--- a/includes/specials/SpecialAllpages.php
+++ b/includes/specials/SpecialAllpages.php
@@ -1,404 +1,445 @@
 <?php
-/**
- * @file
- * @ingroup SpecialPage
- */
-
-/**
- * Entry point : initialise variables and call subfunctions.
- * @param $par String: becomes "FOO" when called like Special:Allpages/FOO (default NULL)
- * @param $specialPage See the SpecialPage object.
- */
-function wfSpecialAllpages( $par=NULL, $specialPage ) {
-	global $wgRequest, $wgOut, $wgContLang;
-
-	# GET values
-	$from = $wgRequest->getVal( 'from' );
-	$namespace = $wgRequest->getInt( 'namespace' );
-
-	$namespaces = $wgContLang->getNamespaces();
-
-	$indexPage = new SpecialAllpages();
-
-	$wgOut->setPagetitle( ( $namespace > 0 && in_array( $namespace, array_keys( $namespaces) ) )  ?
-		wfMsg( 'allinnamespace', str_replace( '_', ' ', $namespaces[$namespace] ) ) :
-		wfMsg( 'allarticles' )
-		);
-
-	if ( isset($par) ) {
-		$indexPage->showChunk( $namespace, $par, $specialPage->including() );
-	} elseif ( isset($from) ) {
-		$indexPage->showChunk( $namespace, $from, $specialPage->including() );
-	} else {
-		$indexPage->showToplevel ( $namespace, $specialPage->including() );
-	}
-}
 
 /**
  * Implements Special:Allpages
  * @ingroup SpecialPage
  */
-class SpecialAllpages {
+class SpecialAllpages extends IncludableSpecialPage {
+
 	/**
 	 * Maximum number of pages to show on single subpage.
 	 */
-	protected $maxPerPage = 960;
+	protected $maxPerPage = 345;
 
 	/**
-	 * Name of this special page. Used to make title objects that reference back
-	 * to this page.
+	 * Maximum number of pages to show on single index subpage.
 	 */
-	protected $name = 'Allpages';
+	protected $maxLineCount = 200;
+
+	/**
+	 * Maximum number of chars to show for an entry.
+	 */
+	protected $maxPageLength = 70;
 
 	/**
 	 * Determines, which message describes the input field 'nsfrom'.
 	 */
 	protected $nsfromMsg = 'allpagesfrom';
 
-/**
- * HTML for the top form
- * @param integer $namespace A namespace constant (default NS_MAIN).
- * @param string $from Article name we are starting listing at.
- */
-function namespaceForm ( $namespace = NS_MAIN, $from = '' ) {
-	global $wgScript;
-	$t = SpecialPage::getTitleFor( $this->name );
-
-	$out  = Xml::openElement( 'div', array( 'class' => 'namespaceoptions' ) );
-	$out .= Xml::openElement( 'form', array( 'method' => 'get', 'action' => $wgScript ) );
-	$out .= Xml::hidden( 'title', $t->getPrefixedText() );
-	$out .= Xml::openElement( 'fieldset' );
-	$out .= Xml::element( 'legend', null, wfMsg( 'allpages' ) );
-	$out .= Xml::openElement( 'table', array( 'id' => 'nsselect', 'class' => 'allpages' ) );
-	$out .= "<tr>
-			<td class='mw-label'>" .
-				Xml::label( wfMsg( $this->nsfromMsg ), 'nsfrom' ) .
-			"</td>
-			<td class='mw-input'>" .
-				Xml::input( 'from', 20, $from, array( 'id' => 'nsfrom' ) ) .
-			"</td>
-		</tr>
-		<tr>
-			<td class='mw-label'>" .
-				Xml::label( wfMsg( 'namespace' ), 'namespace' ) .
-			"</td>
-			<td class='mw-input'>" .
-				Xml::namespaceSelector( $namespace, null ) . ' ' .
-				Xml::submitButton( wfMsg( 'allpagessubmit' ) ) .
-			"</td>
-			</tr>";
-	$out .= Xml::closeElement( 'table' );
-	$out .= Xml::closeElement( 'fieldset' );
-	$out .= Xml::closeElement( 'form' );
-	$out .= Xml::closeElement( 'div' );
-	return $out;
-}
+	function __construct( $name = 'Allpages' ){
+		parent::__construct( $name );	
+	}
 
-/**
- * @param integer $namespace (default NS_MAIN)
- */
-function showToplevel ( $namespace = NS_MAIN, $including = false ) {
-	global $wgOut, $wgContLang;
-	$align = $wgContLang->isRtl() ? 'left' : 'right';
+	/**
+	 * Entry point : initialise variables and call subfunctions.
+	 * @param $par String: becomes "FOO" when called like Special:Allpages/FOO (default NULL)
+	 * @param $specialPage See the SpecialPage object.
+	 */
+	function execute( $par ) {
+		global $wgRequest, $wgOut, $wgContLang;
 
-	# TODO: Either make this *much* faster or cache the title index points
-	# in the querycache table.
+		$this->setHeaders();
+		$this->outputHeader();
 
-	$dbr = wfGetDB( DB_SLAVE );
-	$out = "";
-	$where = array( 'page_namespace' => $namespace );
+		# GET values
+		$from = $wgRequest->getVal( 'from', null );
+		$to = $wgRequest->getVal( 'to', null );
+		$namespace = $wgRequest->getInt( 'namespace' );
 
-	global $wgMemc;
-	$key = wfMemcKey( 'allpages', 'ns', $namespace );
-	$lines = $wgMemc->get( $key );
+		$namespaces = $wgContLang->getNamespaces();
 
-	if( !is_array( $lines ) ) {
-		$options = array( 'LIMIT' => 1 );
-		if ( ! $dbr->implicitOrderby() ) {
-			$options['ORDER BY'] = 'page_title';
+		$wgOut->setPagetitle( ( $namespace > 0 && in_array( $namespace, array_keys( $namespaces) ) )  ?
+			wfMsg( 'allinnamespace', str_replace( '_', ' ', $namespaces[$namespace] ) ) :
+			wfMsg( 'allarticles' )
+		);
+
+		if( isset($par) ) {
+			$this->showChunk( $namespace, $par, $to );
+		} elseif( isset($from) && !isset($to) ) {
+			$this->showChunk( $namespace, $from, $to );
+		} else {
+			$this->showToplevel( $namespace, $from, $to );
 		}
-		$firstTitle = $dbr->selectField( 'page', 'page_title', $where, __METHOD__, $options );
-		$lastTitle = $firstTitle;
-
-		# This array is going to hold the page_titles in order.
-		$lines = array( $firstTitle );
-
-		# If we are going to show n rows, we need n+1 queries to find the relevant titles.
-		$done = false;
-		for( $i = 0; !$done; ++$i ) {
-			// Fetch the last title of this chunk and the first of the next
-			$chunk = is_null( $lastTitle )
-				? ''
-				: 'page_title >= ' . $dbr->addQuotes( $lastTitle );
-			$res = $dbr->select(
-				'page', /* FROM */
-				'page_title', /* WHAT */
-				$where + array($chunk),
-				__METHOD__,
-				array ('LIMIT' => 2, 'OFFSET' => $this->maxPerPage - 1, 'ORDER BY' => 'page_title') );
+	}
 
-			if ( $s = $dbr->fetchObject( $res ) ) {
-				array_push( $lines, $s->page_title );
-			} else {
-				// Final chunk, but ended prematurely. Go back and find the end.
-				$endTitle = $dbr->selectField( 'page', 'MAX(page_title)',
-					array(
-						'page_namespace' => $namespace,
-						$chunk
-					), __METHOD__ );
-				array_push( $lines, $endTitle );
-				$done = true;
+	/**
+	 * HTML for the top form
+	 * @param integer $namespace A namespace constant (default NS_MAIN).
+	 * @param string $from dbKey we are starting listing at.
+	 * @param string $to dbKey we are ending listing at.
+	 */
+	function namespaceForm( $namespace = NS_MAIN, $from = '', $to = '' ) {
+	    global $wgScript;
+	    $t = $this->getTitle();
+
+	    $out  = Xml::openElement( 'div', array( 'class' => 'namespaceoptions' ) );
+	    $out .= Xml::openElement( 'form', array( 'method' => 'get', 'action' => $wgScript ) );
+	    $out .= Xml::hidden( 'title', $t->getPrefixedText() );
+	    $out .= Xml::openElement( 'fieldset' );
+	    $out .= Xml::element( 'legend', null, wfMsg( 'allpages' ) );
+	    $out .= Xml::openElement( 'table', array( 'id' => 'nsselect', 'class' => 'allpages' ) );
+	    $out .= "<tr>
+	            <td class='mw-label'>" .
+	                Xml::label( wfMsg( 'allpagesfrom' ), 'nsfrom' ) .
+	            "</td>
+	            <td class='mw-input'>" .
+	                Xml::input( 'from', 30, str_replace('_',' ',$from), array( 'id' => 'nsfrom' ) ) .
+	            "</td>
+	        </tr>
+	        <tr>
+	            <td class='mw-label'>" .
+	                Xml::label( wfMsg( 'allpagesto' ), 'nsto' ) .
+	            "</td>
+	            <td class='mw-input'>" .
+	                Xml::input( 'to', 30, str_replace('_',' ',$to), array( 'id' => 'nsto' ) ) .
+	            "</td>
+	        </tr>
+	        <tr>
+	            <td class='mw-label'>" .
+	                Xml::label( wfMsg( 'namespace' ), 'namespace' ) .
+	            "</td>
+	            <td class='mw-input'>" .
+	                Xml::namespaceSelector( $namespace, null ) . ' ' .
+	                Xml::submitButton( wfMsg( 'allpagessubmit' ) ) .
+	            "</td>
+	            </tr>";
+	    $out .= Xml::closeElement( 'table' );
+	    $out .= Xml::closeElement( 'fieldset' );
+	    $out .= Xml::closeElement( 'form' );
+	    $out .= Xml::closeElement( 'div' );
+	    return $out;
+	}
+
+	/**
+	 * @param integer $namespace (default NS_MAIN)
+	 */
+	function showToplevel( $namespace = NS_MAIN, $from = '', $to = '' ) {
+		global $wgOut, $wgContLang;
+		$align = $wgContLang->isRtl() ? 'left' : 'right';
+
+		# TODO: Either make this *much* faster or cache the title index points
+		# in the querycache table.
+
+		$dbr = wfGetDB( DB_SLAVE );
+		$out = "";
+		$where = array( 'page_namespace' => $namespace );
+
+		$from = Title::makeTitleSafe( $namespace, $from );
+		$to = Title::makeTitleSafe( $namespace, $to );
+		$from = ( $from && $from->isLocal() ) ? $from->getDBKey() : null;
+		$to = ( $to && $to->isLocal() ) ? $to->getDBKey() : null;
+
+		if( isset($from) )
+			$where[] = 'page_title >= '.$dbr->addQuotes( $from );
+		if( isset($to) )
+			$where[] = 'page_title <= '.$dbr->addQuotes( $to );
+
+		global $wgMemc;
+		$key = wfMemcKey( 'allpages', 'ns', $namespace, $from, $to );
+		$lines = $wgMemc->get( $key );
+
+		$count = $dbr->estimateRowCount( 'page', '*', $where, __METHOD__ );
+		$maxPerSubpage = intval($count/$this->maxLineCount);
+		$maxPerSubpage = max($maxPerSubpage,$this->maxPerPage);
+
+		if( !is_array( $lines ) ) {
+			$options = array( 'LIMIT' => 1 );
+			$options['ORDER BY'] = 'page_title ASC';
+			$firstTitle = $dbr->selectField( 'page', 'page_title', $where, __METHOD__, $options );
+			$lastTitle = $firstTitle;
+			# This array is going to hold the page_titles in order.
+			$lines = array( $firstTitle );
+			# If we are going to show n rows, we need n+1 queries to find the relevant titles.
+			$done = false;
+			while( !$done ) {
+				// Fetch the last title of this chunk and the first of the next
+				$chunk = ( $lastTitle === false )
+					? array()
+					: array( 'page_title >= ' . $dbr->addQuotes( $lastTitle ) );
+				$res = $dbr->select( 'page', /* FROM */
+					'page_title', /* WHAT */
+					array_merge($where,$chunk),
+					__METHOD__,
+					array ('LIMIT' => 2, 'OFFSET' => $maxPerSubpage - 1, 'ORDER BY' => 'page_title ASC')
+				);
+
+				if( $s = $dbr->fetchObject( $res ) ) {
+					array_push( $lines, $s->page_title );
+				} else {
+					// Final chunk, but ended prematurely. Go back and find the end.
+					$endTitle = $dbr->selectField( 'page', 'MAX(page_title)',
+						array_merge($where,$chunk),
+						__METHOD__ );
+					array_push( $lines, $endTitle );
+					$done = true;
+				}
+				if( $s = $res->fetchObject() ) {
+					array_push( $lines, $s->page_title );
+					$lastTitle = $s->page_title;
+				} else {
+					// This was a final chunk and ended exactly at the limit.
+					// Rare but convenient!
+					$done = true;
+				}
+				$res->free();
 			}
-			if( $s = $dbr->fetchObject( $res ) ) {
-				array_push( $lines, $s->page_title );
-				$lastTitle = $s->page_title;
+			$wgMemc->add( $key, $lines, 3600 );
+		}
+
+		// If there are only two or less sections, don't even display them.
+		// Instead, display the first section directly.
+		if( count( $lines ) <= 2 ) {
+			if( !empty($lines) ) {
+				$this->showChunk( $namespace, $lines[0], $lines[count($lines)-1] );
 			} else {
-				// This was a final chunk and ended exactly at the limit.
-				// Rare but convenient!
-				$done = true;
+				$wgOut->addHTML( $this->namespaceForm( $namespace, $from, $to ) );
 			}
-			$dbr->freeResult( $res );
+			return;
 		}
-		$wgMemc->add( $key, $lines, 3600 );
-	}
 
-	// If there are only two or less sections, don't even display them.
-	// Instead, display the first section directly.
-	if( count( $lines ) <= 2 ) {
-		$this->showChunk( $namespace, '', $including );
-		return;
-	}
+		# At this point, $lines should contain an even number of elements.
+		$out .= "<table class='allpageslist' style='background: inherit;'>";
+		while( count ( $lines ) > 0 ) {
+			$inpoint = array_shift( $lines );
+			$outpoint = array_shift( $lines );
+			$out .= $this->showline( $inpoint, $outpoint, $namespace );
+		}
+		$out .= '</table>';
+		$nsForm = $this->namespaceForm( $namespace, $from, $to );
 
-	# At this point, $lines should contain an even number of elements.
-	$out .= "<table class='allpageslist' style='background: inherit;'>";
-	while ( count ( $lines ) > 0 ) {
-		$inpoint = array_shift ( $lines );
-		$outpoint = array_shift ( $lines );
-		$out .= $this->showline ( $inpoint, $outpoint, $namespace, false );
-	}
-	$out .= '</table>';
-	$nsForm = $this->namespaceForm( $namespace, '', false );
-
-	# Is there more?
-	if ( $including ) {
-		$out2 = '';
-	} else {
-		$morelinks = '';
-		if ( $morelinks != '' ) {
-			$out2 = '<table style="background: inherit;" width="100%" cellpadding="0" cellspacing="0" border="0">';
-			$out2 .= '<tr valign="top"><td>' . $nsForm;
-			$out2 .= '</td><td align="' . $align . '" style="font-size: smaller; margin-bottom: 1em;">';
-			$out2 .= $morelinks . '</td></tr></table><hr />';
+		# Is there more?
+		if( $this->including() ) {
+			$out2 = '';
 		} else {
-			$out2 = $nsForm . '<hr />';
+			if( isset($from) || isset($to) ) {
+				global $wgUser;
+				$out2 = '<table style="background: inherit;" width="100%" cellpadding="0" cellspacing="0" border="0">';
+				$out2 .= '<tr valign="top"><td>' . $nsForm;
+				$out2 .= '</td><td align="' . $align . '" style="font-size: smaller; margin-bottom: 1em;">' .
+					$wgUser->getSkin()->makeKnownLinkObj( $this->getTitle(), wfMsgHtml ( 'allpages' ) );
+				$out2 .= "</td></tr></table><hr />";
+			} else {
+				$out2 = $nsForm . '<hr />';
+			}
 		}
+		$wgOut->addHTML( $out2 . $out );
 	}
 
-	$wgOut->addHtml( $out2 . $out );
-}
-
-/**
- * @todo Document
- * @param string $from
- * @param integer $namespace (Default NS_MAIN)
- */
-function showline( $inpoint, $outpoint, $namespace = NS_MAIN ) {
-	global $wgContLang;
-	$align = $wgContLang->isRtl() ? 'left' : 'right';
-	$inpointf = htmlspecialchars( str_replace( '_', ' ', $inpoint ) );
-	$outpointf = htmlspecialchars( str_replace( '_', ' ', $outpoint ) );
-	$queryparams = ($namespace ? "namespace=$namespace" : '');
-	$special = SpecialPage::getTitleFor( $this->name, $inpoint );
-	$link = $special->escapeLocalUrl( $queryparams );
-
-	$out = wfMsgHtml(
-		'alphaindexline',
-		"<a href=\"$link\">$inpointf</a></td><td><a href=\"$link\">",
-		"</a></td><td><a href=\"$link\">$outpointf</a>"
-	);
-	return '<tr><td align="' . $align . '">'.$out.'</td></tr>';
-}
+	/**
+	 * Show a line of "ABC to DEF" ranges of articles
+	 * @param string $inpoint Lower limit of pagenames
+	 * @param string $outpout Upper limit of pagenames
+	 * @param integer $namespace (Default NS_MAIN)
+	 */
+	function showline( $inpoint, $outpoint, $namespace = NS_MAIN ) {
+		global $wgContLang;
+		$align = $wgContLang->isRtl() ? 'left' : 'right';
+		$inpointf = htmlspecialchars( str_replace( '_', ' ', $inpoint ) );
+		$outpointf = htmlspecialchars( str_replace( '_', ' ', $outpoint ) );
+		// Don't let the length runaway
+		$inpointf = $wgContLang->truncate( $inpointf, $this->maxPageLength, '...' );
+		$outpointf = $wgContLang->truncate( $outpointf, $this->maxPageLength, '...' );
+
+		$queryparams = $namespace ? "namespace=$namespace&" : '';
+		$special = $this->getTitle();
+		$link = $special->escapeLocalUrl( $queryparams . 'from=' . urlencode($inpoint) . '&to=' . urlencode($outpoint) );
+
+		$out = wfMsgHtml( 'alphaindexline',
+			"<a href=\"$link\">$inpointf</a></td><td>",
+			"</td><td><a href=\"$link\">$outpointf</a>"
+		);
+		return '<tr><td align="' . $align . '">'.$out.'</td></tr>';
+	}
 
-/**
- * @param integer $namespace (Default NS_MAIN)
- * @param string $from list all pages from this name (default FALSE)
- */
-function showChunk( $namespace = NS_MAIN, $from, $including = false ) {
-	global $wgOut, $wgUser, $wgContLang;
+	/**
+	 * @param integer $namespace (Default NS_MAIN)
+	 * @param string $from list all pages from this name (default FALSE)
+	 * @param string $to list all pages to this name (default FALSE)
+	 */
+	function showChunk( $namespace = NS_MAIN, $from = false, $to = false ) {
+		global $wgOut, $wgUser, $wgContLang;
 
-	$sk = $wgUser->getSkin();
+		$sk = $wgUser->getSkin();
 
-	$fromList = $this->getNamespaceKeyAndText($namespace, $from);
-	$namespaces = $wgContLang->getNamespaces();
-	$align = $wgContLang->isRtl() ? 'left' : 'right';
+		$fromList = $this->getNamespaceKeyAndText($namespace, $from);
+		$toList = $this->getNamespaceKeyAndText( $namespace, $to );
+		$namespaces = $wgContLang->getNamespaces();
+		$align = $wgContLang->isRtl() ? 'left' : 'right';
 
-	$n = 0;
+		$n = 0;
 
-	if ( !$fromList ) {
-		$out = wfMsgWikiHtml( 'allpagesbadtitle' );
-	} elseif ( !in_array( $namespace, array_keys( $namespaces ) ) ) {
-		// Show errormessage and reset to NS_MAIN
-		$out = wfMsgExt( 'allpages-bad-ns', array( 'parseinline' ), $namespace );
-		$namespace = NS_MAIN;
-	} else {
-		list( $namespace, $fromKey, $from ) = $fromList;
+		if ( !$fromList || !$toList ) {
+			$out = wfMsgWikiHtml( 'allpagesbadtitle' );
+		} elseif ( !in_array( $namespace, array_keys( $namespaces ) ) ) {
+			// Show errormessage and reset to NS_MAIN
+			$out = wfMsgExt( 'allpages-bad-ns', array( 'parseinline' ), $namespace );
+			$namespace = NS_MAIN;
+		} else {
+			list( $namespace, $fromKey, $from ) = $fromList;
+			list( $namespace2, $toKey, $to ) = $toList;
 
-		$dbr = wfGetDB( DB_SLAVE );
-		$res = $dbr->select( 'page',
-			array( 'page_namespace', 'page_title', 'page_is_redirect' ),
-			array(
+			$dbr = wfGetDB( DB_SLAVE );
+			$conds = array(
 				'page_namespace' => $namespace,
 				'page_title >= ' . $dbr->addQuotes( $fromKey )
-			),
-			__METHOD__,
-			array(
-				'ORDER BY'  => 'page_title',
-				'LIMIT'     => $this->maxPerPage + 1,
-				'USE INDEX' => 'name_title',
-			)
-		);
+			);
+			if( $toKey !== "" ) {
+				$conds[] = 'page_title <= ' . $dbr->addQuotes( $toKey );
+			}
 
-		if( $res->numRows() > 0 ) {
-			$out = '<table style="background: inherit;" border="0" width="100%">';
-	
-			while( ($n < $this->maxPerPage) && ($s = $dbr->fetchObject( $res )) ) {
-				$t = Title::makeTitle( $s->page_namespace, $s->page_title );
-				if( $t ) {
-					$link = ($s->page_is_redirect ? '<div class="allpagesredirect">' : '' ) .
-						$sk->makeKnownLinkObj( $t, htmlspecialchars( $t->getText() ), false, false ) .
-						($s->page_is_redirect ? '</div>' : '' );
-				} else {
-					$link = '[[' . htmlspecialchars( $s->page_title ) . ']]';
-				}
-				if( $n % 3 == 0 ) {
-					$out .= '<tr>';
+			$res = $dbr->select( 'page',
+				array( 'page_namespace', 'page_title', 'page_is_redirect' ),
+				$conds,
+				__METHOD__,
+				array(
+					'ORDER BY'  => 'page_title',
+					'LIMIT'     => $this->maxPerPage + 1,
+					'USE INDEX' => 'name_title',
+				)
+			);
+
+			if( $res->numRows() > 0 ) {
+				$out = '<table style="background: inherit;" border="0" width="100%">';
+
+				while( ( $n < $this->maxPerPage ) && ( $s = $res->fetchObject() ) ) {
+					$t = Title::makeTitle( $s->page_namespace, $s->page_title );
+					if( $t ) {
+						$link = ( $s->page_is_redirect ? '<div class="allpagesredirect">' : '' ) .
+							$sk->makeKnownLinkObj( $t, htmlspecialchars( $t->getText() ), false, false ) .
+							($s->page_is_redirect ? '</div>' : '' );
+					} else {
+						$link = '[[' . htmlspecialchars( $s->page_title ) . ']]';
+					}
+					if( $n % 3 == 0 ) {
+						$out .= '<tr>';
+					}
+					$out .= "<td width=\"33%\">$link</td>";
+					$n++;
+					if( $n % 3 == 0 ) {
+						$out .= '</tr>';
+					}
 				}
-				$out .= "<td width=\"33%\">$link</td>";
-				$n++;
-				if( $n % 3 == 0 ) {
+				if( ($n % 3) != 0 ) {
 					$out .= '</tr>';
 				}
+				$out .= '</table>';
+			} else {
+				$out = '';
 			}
-			if( ($n % 3) != 0 ) {
-				$out .= '</tr>';
-			}
-			$out .= '</table>';
-		} else {
-			$out = '';
 		}
-	}
 
-	if ( $including ) {
-		$out2 = '';
-	} else {
-		if( $from == '' ) {
-			// First chunk; no previous link.
-			$prevTitle = null;
+		if ( $this->including() ) {
+			$out2 = '';
 		} else {
-			# Get the last title from previous chunk
-			$dbr = wfGetDB( DB_SLAVE );
-			$res_prev = $dbr->select(
-				'page',
-				'page_title',
-				array( 'page_namespace' => $namespace, 'page_title < '.$dbr->addQuotes($from) ),
-				__METHOD__,
-				array( 'ORDER BY' => 'page_title DESC', 'LIMIT' => $this->maxPerPage, 'OFFSET' => ($this->maxPerPage - 1 ) )
-			);
-
-			# Get first title of previous complete chunk
-			if( $dbr->numrows( $res_prev ) >= $this->maxPerPage ) {
-				$pt = $dbr->fetchObject( $res_prev );
-				$prevTitle = Title::makeTitle( $namespace, $pt->page_title );
+			if( $from == '' ) {
+				// First chunk; no previous link.
+				$prevTitle = null;
 			} else {
-				# The previous chunk is not complete, need to link to the very first title
-				# available in the database
-				$options = array( 'LIMIT' => 1 );
-				if ( ! $dbr->implicitOrderby() ) {
-					$options['ORDER BY'] = 'page_title';
-				}
-				$reallyFirstPage_title = $dbr->selectField( 'page', 'page_title', array( 'page_namespace' => $namespace ), __METHOD__, $options );
-				# Show the previous link if it s not the current requested chunk
-				if( $from != $reallyFirstPage_title ) {
-					$prevTitle =  Title::makeTitle( $namespace, $reallyFirstPage_title );
+				# Get the last title from previous chunk
+				$dbr = wfGetDB( DB_SLAVE );
+				$res_prev = $dbr->select(
+					'page',
+					'page_title',
+					array( 'page_namespace' => $namespace, 'page_title < '.$dbr->addQuotes($from) ),
+					__METHOD__,
+					array( 'ORDER BY' => 'page_title DESC', 'LIMIT' => $this->maxPerPage, 'OFFSET' => ($this->maxPerPage - 1 ) )
+				);
+
+				# Get first title of previous complete chunk
+				if( $dbr->numrows( $res_prev ) >= $this->maxPerPage ) {
+					$pt = $dbr->fetchObject( $res_prev );
+					$prevTitle = Title::makeTitle( $namespace, $pt->page_title );
 				} else {
-					$prevTitle = null;
+					# The previous chunk is not complete, need to link to the very first title
+					# available in the database
+					$options = array( 'LIMIT' => 1 );
+					if ( ! $dbr->implicitOrderby() ) {
+						$options['ORDER BY'] = 'page_title';
+					}
+					$reallyFirstPage_title = $dbr->selectField( 'page', 'page_title',
+						array( 'page_namespace' => $namespace ), __METHOD__, $options );
+					# Show the previous link if it s not the current requested chunk
+					if( $from != $reallyFirstPage_title ) {
+						$prevTitle =  Title::makeTitle( $namespace, $reallyFirstPage_title );
+					} else {
+						$prevTitle = null;
+					}
 				}
 			}
-		}
 
-		$nsForm = $this->namespaceForm( $namespace, $from );
-		$out2 = '<table style="background: inherit;" width="100%" cellpadding="0" cellspacing="0" border="0">';
-		$out2 .= '<tr valign="top"><td>' . $nsForm;
-		$out2 .= '</td><td align="' . $align . '" style="font-size: smaller; margin-bottom: 1em;">' .
-				$sk->makeKnownLink( $wgContLang->specialPage( "Allpages" ),
-					wfMsgHtml ( 'allpages' ) );
-
-		$self = SpecialPage::getTitleFor( 'Allpages' );
-
-		# Do we put a previous link ?
-		if( isset( $prevTitle ) &&  $pt = $prevTitle->getText() ) {
-			$q = 'from=' . $prevTitle->getPartialUrl()
-				. ( $namespace ? '&namespace=' . $namespace : '' );
-			$prevLink = $sk->makeKnownLinkObj( $self,
-				wfMsgHTML( 'prevpage', htmlspecialchars( $pt ) ), $q );
-			$out2 .= ' | ' . $prevLink;
-		}
+			$self = $this->getTitle();
 
-		if( $n == $this->maxPerPage && $s = $dbr->fetchObject($res) ) {
-			# $s is the first link of the next chunk
-			$t = Title::MakeTitle($namespace, $s->page_title);
-			$q = 'from=' . $t->getPartialUrl()
-				. ( $namespace ? '&namespace=' . $namespace : '' );
-			$nextLink = $sk->makeKnownLinkObj( $self,
-				wfMsgHtml( 'nextpage', htmlspecialchars( $t->getText() ) ), $q );
-			$out2 .= ' | ' . $nextLink;
-		}
-		$out2 .= "</td></tr></table><hr />";
-	}
+			$nsForm = $this->namespaceForm( $namespace, $from, $to );
+			$out2 = '<table style="background: inherit;" width="100%" cellpadding="0" cellspacing="0" border="0">';
+			$out2 .= '<tr valign="top"><td>' . $nsForm;
+			$out2 .= '</td><td align="' . $align . '" style="font-size: smaller; margin-bottom: 1em;">' .
+					$sk->makeKnownLinkObj( $self,
+						wfMsgHtml ( 'allpages' ) );
+
+			# Do we put a previous link ?
+			if( isset( $prevTitle ) &&  $pt = $prevTitle->getText() ) {
+				$q = 'from=' . $prevTitle->getPartialUrl()
+					. ( $namespace ? '&namespace=' . $namespace : '' );
+				$prevLink = $sk->makeKnownLinkObj( $self,
+					wfMsgHTML( 'prevpage', htmlspecialchars( $pt ) ), $q );
+				$out2 .= ' | ' . $prevLink;
+			}
 
-	$wgOut->addHtml( $out2 . $out );
-	if( isset($prevLink) or isset($nextLink) ) {
-		$wgOut->addHtml( '<hr /><p style="font-size: smaller; float: ' . $align . '">' );
-		if( isset( $prevLink ) ) {
-			$wgOut->addHTML( $prevLink );
-		}
-		if( isset( $prevLink ) && isset( $nextLink ) ) {
-			$wgOut->addHTML( ' | ' );
-		}
-		if( isset( $nextLink ) ) {
-			$wgOut->addHTML( $nextLink );
+			if( $n == $this->maxPerPage && $s = $res->fetchObject() ) {
+				# $s is the first link of the next chunk
+				$t = Title::MakeTitle($namespace, $s->page_title);
+				$q = 'from=' . $t->getPartialUrl()
+					. ( $namespace ? '&namespace=' . $namespace : '' );
+				$nextLink = $sk->makeKnownLinkObj( $self,
+					wfMsgHtml( 'nextpage', htmlspecialchars( $t->getText() ) ), $q );
+				$out2 .= ' | ' . $nextLink;
+			}
+			$out2 .= "</td></tr></table><hr />";
 		}
-		$wgOut->addHTML( '</p>' );
 
-	}
+		$wgOut->addHTML( $out2 . $out );
+		if( isset($prevLink) or isset($nextLink) ) {
+			$wgOut->addHTML( '<hr /><p style="font-size: smaller; float: ' . $align . '">' );
+			if( isset( $prevLink ) ) {
+				$wgOut->addHTML( $prevLink );
+			}
+			if( isset( $prevLink ) && isset( $nextLink ) ) {
+				$wgOut->addHTML( ' | ' );
+			}
+			if( isset( $nextLink ) ) {
+				$wgOut->addHTML( $nextLink );
+			}
+			$wgOut->addHTML( '</p>' );
 
-}
+		}
 
-/**
- * @param int $ns the namespace of the article
- * @param string $text the name of the article
- * @return array( int namespace, string dbkey, string pagename ) or NULL on error
- * @static (sort of)
- * @access private
- */
-function getNamespaceKeyAndText ($ns, $text) {
-	if ( $text == '' )
-		return array( $ns, '', '' ); # shortcut for common case
-
-	$t = Title::makeTitleSafe($ns, $text);
-	if ( $t && $t->isLocal() ) {
-		return array( $t->getNamespace(), $t->getDBkey(), $t->getText() );
-	} else if ( $t ) {
-		return NULL;
 	}
 
-	# try again, in case the problem was an empty pagename
-	$text = preg_replace('/(#|$)/', 'X$1', $text);
-	$t = Title::makeTitleSafe($ns, $text);
-	if ( $t && $t->isLocal() ) {
-		return array( $t->getNamespace(), '', '' );
-	} else {
-		return NULL;
+	/**
+	 * @param int $ns the namespace of the article
+	 * @param string $text the name of the article
+	 * @return array( int namespace, string dbkey, string pagename ) or NULL on error
+	 * @static (sort of)
+	 * @access private
+	 */
+	function getNamespaceKeyAndText($ns, $text) {
+		if ( $text == '' )
+			return array( $ns, '', '' ); # shortcut for common case
+
+		$t = Title::makeTitleSafe($ns, $text);
+		if ( $t && $t->isLocal() ) {
+			return array( $t->getNamespace(), $t->getDBkey(), $t->getText() );
+		} else if ( $t ) {
+			return NULL;
+		}
+
+		# try again, in case the problem was an empty pagename
+		$text = preg_replace('/(#|$)/', 'X$1', $text);
+		$t = Title::makeTitleSafe($ns, $text);
+		if ( $t && $t->isLocal() ) {
+			return array( $t->getNamespace(), '', '' );
+		} else {
+			return NULL;
+		}
 	}
 }
-}