SpecialPrefixindex.php

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<?php
class SpecialPrefixindex extends SpecialAllPages {

    protected $stripPrefix = false;

    protected $hideRedirects = false;

    // 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).
        $this->hideRedirects = $request->getBool( 'hideredirects', $this->hideRedirects );
        $this->stripPrefix = $request->getBool( 'stripprefix', $this->stripPrefix );

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

        $showme = '';
        if ( $par !== null ) {
            $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 ) );
        }
    }

    protected function namespacePrefixForm( $namespace = NS_MAIN, $from = '' ) {
        $out = Xml::openElement( 'div', [ 'class' => 'namespaceoptions' ] );
        $out .= Xml::openElement(
            'form',
            [ 'method' => 'get', 'action' => $this->getConfig()->get( 'Script' ) ]
        );
        $out .= Html::hidden( 'title', $this->getPageTitle()->getPrefixedText() );
        $out .= Xml::openElement( 'fieldset' );
        $out .= Xml::element( 'legend', null, $this->msg( 'allpages' )->text() );
        $out .= Xml::openElement( 'table', [ 'id' => 'nsselect', 'class' => 'allpages' ] );
        $out .= "<tr>
                <td class='mw-label'>" .
            Xml::label( $this->msg( 'allpagesprefix' )->text(), 'nsfrom' ) .
            "</td>
                <td class='mw-input'>" .
            Xml::input( 'prefix', 30, str_replace( '_', ' ', $from ), [ 'id' => 'nsfrom' ] ) .
            "</td>
            </tr>
            <tr>
            <td class='mw-label'>" .
            Xml::label( $this->msg( 'namespace' )->text(), 'namespace' ) .
            "</td>
                <td class='mw-input'>" .
            Html::namespaceSelector( [
                'selected' => $namespace,
            ], [
                'name' => 'namespace',
                'id' => 'namespace',
                'class' => 'namespaceselector',
            ] ) .
            Xml::checkLabel(
                $this->msg( 'allpages-hide-redirects' )->text(),
                'hideredirects',
                'hideredirects',
                $this->hideRedirects
            ) . ' ' .
            Xml::checkLabel(
                $this->msg( 'prefixindex-strip' )->text(),
                'stripprefix',
                'stripprefix',
                $this->stripPrefix
            ) . ' ' .
            Xml::submitButton( $this->msg( 'prefixindex-submit' )->text() ) .
            "</td>
            </tr>";
        $out .= Xml::closeElement( 'table' );
        $out .= Xml::closeElement( 'fieldset' );
        $out .= Xml::closeElement( 'form' );
        $out .= Xml::closeElement( 'div' );

        return $out;
    }

    protected 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();
        $res = null;

        if ( !$prefixList || !$fromList ) {
            $out = $this->msg( 'allpagesbadtitle' )->parseAsBlock();
        } elseif ( !array_key_exists( $namespace, $namespaces ) ) {
            // Show errormessage and reset to NS_MAIN
            $out = $this->msg( 'allpages-bad-ns', $namespace )->parse();
            $namespace = NS_MAIN;
        } else {
            list( $namespace, $prefixKey, $prefix ) = $prefixList;
            list( /* $fromNS */, $fromKey, ) = $fromList;

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

            $dbr = wfGetDB( DB_SLAVE );

            $conds = [
                'page_namespace' => $namespace,
                'page_title' . $dbr->buildLike( $prefixKey, $dbr->anyString() ),
                'page_title >= ' . $dbr->addQuotes( $fromKey ),
            ];

            if ( $this->hideRedirects ) {
                $conds['page_is_redirect'] = 0;
            }

            $res = $dbr->select( 'page',
                [ 'page_namespace', 'page_title', 'page_is_redirect' ],
                $conds,
                __METHOD__,
                [
                    '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 = Html::openElement( 'ul', [ 'class' => 'mw-prefixindex-list' ] );

                $prefixLength = strlen( $prefix );
                while ( ( $n < $this->maxPerPage ) && ( $s = $res->fetchObject() ) ) {
                    $t = Title::makeTitle( $s->page_namespace, $s->page_title );
                    if ( $t ) {
                        $displayed = $t->getText();
                        // Try not to generate unclickable links
                        if ( $this->stripPrefix && $prefixLength !== strlen( $displayed ) ) {
                            $displayed = substr( $displayed, $prefixLength );
                        }
                        $link = ( $s->page_is_redirect ? '<div class="allpagesredirect">' : '' ) .
                            Linker::linkKnown(
                                $t,
                                htmlspecialchars( $displayed ),
                                $s->page_is_redirect ? [ 'class' => 'mw-redirect' ] : []
                            ) .
                            ( $s->page_is_redirect ? '</div>' : '' );
                    } else {
                        $link = '[[' . htmlspecialchars( $s->page_title ) . ']]';
                    }

                    $out .= "<li>$link</li>\n";
                    $n++;

                }
                $out .= Html::closeElement( 'ul' );

                if ( $res->numRows() > 2 ) {
                    // Only apply CSS column styles if there's more than 2 entries.
                    // Otherwise rendering is broken as "mw-prefixindex-body"'s CSS column count is 3.
                    $out = Html::rawElement( 'div', [ 'class' => 'mw-prefixindex-body' ], $out );
                }
            } else {
                $out = '';
            }
        }

        $output = $this->getOutput();

        if ( $this->including() ) {
            // We don't show the nav-links and the form when included into other
            // pages so let's just finish here.
            $output->addHTML( $out );
            return;
        }

        $topOut = $this->namespacePrefixForm( $namespace, $prefix );

        if ( $res && ( $n == $this->maxPerPage ) && ( $s = $res->fetchObject() ) ) {
            $query = [
                'from' => $s->page_title,
                'prefix' => $prefix,
                'hideredirects' => $this->hideRedirects,
                'stripprefix' => $this->stripPrefix,
            ];

            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(
                $this->getPageTitle(),
                $this->msg( 'nextpage', str_replace( '_', ' ', $s->page_title ) )->escaped(),
                [],
                $query
            );

            // Link shown at the top of the page below the form
            $topOut .= Html::rawElement( 'div',
                [ 'class' => 'mw-prefixindex-nav' ],
                $nextLink
            );

            // Link shown at the footer
            $out .= "\n" . Html::element( 'hr' ) .
                Html::rawElement(
                    'div',
                    [ 'class' => 'mw-prefixindex-nav' ],
                    $nextLink
                );

        }

        $output->addHTML( $topOut . $out );
    }

    public function prefixSearchSubpages( $search, $limit, $offset ) {
        return $this->prefixSearchString( $search, $limit, $offset );
    }

    protected function getGroupName() {
        return 'pages';
    }
}