SpecialPrefixindex.php

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<?php
class SpecialPrefixindex extends SpecialAllpages {
        // Inherit $maxPerPage

        function __construct(){
                parent::__construct( 'Prefixindex' );
        }

        function execute( $par ) {
                global $wgContLang;

                $this->setHeaders();
                $this->outputHeader();

                $out = $this->getOutput();
                $out->addModuleStyles( 'mediawiki.special' );

                # GET values
                $request = $this->getRequest();
                $from = $request->getVal( 'from', '' );
                $prefix = $request->getVal( 'prefix', '' );
                $ns = $request->getIntOrNull( 'namespace' );
                $namespace = (int)$ns; // if no namespace given, use 0 (NS_MAIN).

                $namespaces = $wgContLang->getNamespaces();
                $out->setPageTitle(
                        ( $namespace > 0 && in_array( $namespace, array_keys( $namespaces ) ) )
                                ? $this->msg( 'prefixindex-namespace', str_replace( '_', ' ', $namespaces[$namespace] ) )
                                : $this->msg( 'prefixindex' )
                );

                $showme = '';
                if( isset( $par ) ) {
                        $showme = $par;
                } elseif( $prefix != '' ) {
                        $showme = $prefix;
                } elseif( $from != '' && $ns === null ) {
                        // For back-compat with Special:Allpages
                        // Don't do this if namespace is passed, so paging works when doing NS views.
                        $showme = $from;
                }

                // Bug 27864: if transcluded, show all pages instead of the form.
                if ( $this->including() || $showme != '' || $ns !== null ) {
                        $this->showPrefixChunk( $namespace, $showme, $from );
                } else {
                        $out->addHTML( $this->namespacePrefixForm( $namespace, null ) );
                }
        }

        function namespacePrefixForm( $namespace = NS_MAIN, $from = '' ) {
                global $wgScript;

                $out  = Xml::openElement( 'div', array( 'class' => 'namespaceoptions' ) );
                $out .= Xml::openElement( 'form', array( 'method' => 'get', 'action' => $wgScript ) );
                $out .= Html::hidden( 'title', $this->getTitle()->getPrefixedText() );
                $out .= Xml::openElement( 'fieldset' );
                $out .= Xml::element( 'legend', null, wfMsg( 'allpages' ) );
                $out .= Xml::openElement( 'table', array( 'id' => 'nsselect', 'class' => 'allpages' ) );
                $out .= "<tr>
                                <td class='mw-label'>" .
                                Xml::label( wfMsg( 'allpagesprefix' ), 'nsfrom' ) .
                                "</td>
                                <td class='mw-input'>" .
                                        Xml::input( 'prefix', 30, str_replace('_',' ',$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 showPrefixChunk( $namespace = NS_MAIN, $prefix, $from = null ) {
                global $wgContLang;

                if ( $from === null ) {
                        $from = $prefix;
                }

                $fromList = $this->getNamespaceKeyAndText($namespace, $from);
                $prefixList = $this->getNamespaceKeyAndText($namespace, $prefix);
                $namespaces = $wgContLang->getNamespaces();

                if ( !$prefixList || !$fromList ) {
                        $out = wfMsgExt( 'allpagesbadtitle', 'parse' );
                } 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, $prefixKey, $prefix ) = $prefixList;
                        list( /* $fromNS */, $fromKey, ) = $fromList;

                        ### @todo FIXME: Should complain if $fromNs != $namespace

                        $dbr = wfGetDB( DB_SLAVE );

                        $res = $dbr->select( 'page',
                                array( 'page_namespace', 'page_title', 'page_is_redirect' ),
                                array(
                                        'page_namespace' => $namespace,
                                        'page_title' . $dbr->buildLike( $prefixKey, $dbr->anyString() ),
                                        'page_title >= ' . $dbr->addQuotes( $fromKey ),
                                ),
                                __METHOD__,
                                array(
                                        'ORDER BY'  => 'page_title',
                                        'LIMIT'     => $this->maxPerPage + 1,
                                        'USE INDEX' => 'name_title',
                                )
                        );

                        ### @todo FIXME: Side link to previous

                        $n = 0;
                        if( $res->numRows() > 0 ) {
                                $out = Xml::openElement( 'table', array( 'border' => '0', 'id' => 'mw-prefixindex-list-table' ) );

                                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">' : '' ) .
                                                        Linker::linkKnown(
                                                                $t,
                                                                htmlspecialchars( $t->getText() )
                                                        ) .
                                                        ($s->page_is_redirect ? '</div>' : '' );
                                        } else {
                                                $link = '[[' . htmlspecialchars( $s->page_title ) . ']]';
                                        }
                                        if( $n % 3 == 0 ) {
                                                $out .= '<tr>';
                                        }
                                        $out .= "<td>$link</td>";
                                        $n++;
                                        if( $n % 3 == 0 ) {
                                                $out .= '</tr>';
                                        }
                                }
                                if( ($n % 3) != 0 ) {
                                        $out .= '</tr>';
                                }
                                $out .= Xml::closeElement( 'table' );
                        } else {
                                $out = '';
                        }
                }

                $footer = '';
                if ( $this->including() ) {
                        $out2 = '';
                } else {
                        $nsForm = $this->namespacePrefixForm( $namespace, $prefix );
                        $self = $this->getTitle();
                        $out2 = Xml::openElement( 'table', array( 'border' => '0', 'id' => 'mw-prefixindex-nav-table' ) )  .
                                '<tr>
                                        <td>' .
                                                $nsForm .
                                        '</td>
                                        <td id="mw-prefixindex-nav-form" class="mw-prefixindex-nav">';

                        if( isset( $res ) && $res && ( $n == $this->maxPerPage ) && ( $s = $res->fetchObject() ) ) {
                                $query = array(
                                        'from' => $s->page_title,
                                        'prefix' => $prefix
                                );

                                if( $namespace || ($prefix == '')) {
                                        // Keep the namespace even if it's 0 for empty prefixes.
                                        // This tells us we're not just a holdover from old links.
                                        $query['namespace'] = $namespace;
                                }
                                $nextLink = Linker::linkKnown(
                                                $self,
                                                wfMsgHtml( 'nextpage', str_replace( '_',' ', htmlspecialchars( $s->page_title ) ) ),
                                                array(),
                                                $query
                                        );
                                $out2 .= $nextLink;

                                $footer = "\n" . Html::element( "hr" )
                                        . Html::rawElement( "div", array( "class" => "mw-prefixindex-nav" ), $nextLink );
                        }
                        $out2 .= "</td></tr>" .
                                Xml::closeElement( 'table' );
                }

                $this->getOutput()->addHTML( $out2 . $out . $footer );
        }
}