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authorPierre Schmitz <pierre@archlinux.de>2008-08-15 01:29:47 +0200
committerPierre Schmitz <pierre@archlinux.de>2008-08-15 01:29:47 +0200
commit370e83bb0dfd0c70de268c93bf07ad5ee0897192 (patch)
tree491674f4c242e4d6ba0d04eafa305174c35a3391 /includes/specials/SpecialRandompage.php
parentf4debf0f12d0524d2b2427c55ea3f16b680fad97 (diff)
Update auf 1.13.0
Diffstat (limited to 'includes/specials/SpecialRandompage.php')
-rw-r--r--includes/specials/SpecialRandompage.php100
1 files changed, 100 insertions, 0 deletions
diff --git a/includes/specials/SpecialRandompage.php b/includes/specials/SpecialRandompage.php
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+<?php
+
+/**
+ * Special page to direct the user to a random page
+ *
+ * @ingroup SpecialPage
+ * @author Rob Church <robchur@gmail.com>, Ilmari Karonen
+ * @license GNU General Public Licence 2.0 or later
+ */
+class RandomPage extends SpecialPage {
+ private $namespace = NS_MAIN; // namespace to select pages from
+
+ function __construct( $name = 'Randompage' ){
+ parent::__construct( $name );
+ }
+
+ public function getNamespace() {
+ return $this->namespace;
+ }
+
+ public function setNamespace ( $ns ) {
+ if( $ns < NS_MAIN ) $ns = NS_MAIN;
+ $this->namespace = $ns;
+ }
+
+ // select redirects instead of normal pages?
+ // Overriden by SpecialRandomredirect
+ public function isRedirect(){
+ return false;
+ }
+
+ public function execute( $par ) {
+ global $wgOut, $wgContLang;
+
+ if ($par)
+ $this->setNamespace( $wgContLang->getNsIndex( $par ) );
+
+ $title = $this->getRandomTitle();
+
+ if( is_null( $title ) ) {
+ $this->setHeaders();
+ $wgOut->addWikiMsg( strtolower( $this->mName ) . '-nopages' );
+ return;
+ }
+
+ $query = $this->isRedirect() ? 'redirect=no' : '';
+ $wgOut->redirect( $title->getFullUrl( $query ) );
+ }
+
+
+ /**
+ * Choose a random title.
+ * @return Title object (or null if nothing to choose from)
+ */
+ public function getRandomTitle() {
+ $randstr = wfRandom();
+ $row = $this->selectRandomPageFromDB( $randstr );
+
+ /* If we picked a value that was higher than any in
+ * the DB, wrap around and select the page with the
+ * lowest value instead! One might think this would
+ * skew the distribution, but in fact it won't cause
+ * any more bias than what the page_random scheme
+ * causes anyway. Trust me, I'm a mathematician. :)
+ */
+ if( !$row )
+ $row = $this->selectRandomPageFromDB( "0" );
+
+ if( $row )
+ return Title::makeTitleSafe( $this->namespace, $row->page_title );
+ else
+ return null;
+ }
+
+ private function selectRandomPageFromDB( $randstr ) {
+ global $wgExtraRandompageSQL;
+ $fname = 'RandomPage::selectRandomPageFromDB';
+
+ $dbr = wfGetDB( DB_SLAVE );
+
+ $use_index = $dbr->useIndexClause( 'page_random' );
+ $page = $dbr->tableName( 'page' );
+
+ $ns = (int) $this->namespace;
+ $redirect = $this->isRedirect() ? 1 : 0;
+
+ $extra = $wgExtraRandompageSQL ? "AND ($wgExtraRandompageSQL)" : "";
+ $sql = "SELECT page_title
+ FROM $page $use_index
+ WHERE page_namespace = $ns
+ AND page_is_redirect = $redirect
+ AND page_random >= $randstr
+ $extra
+ ORDER BY page_random";
+
+ $sql = $dbr->limitResult( $sql, 1, 0 );
+ $res = $dbr->query( $sql, $fname );
+ return $dbr->fetchObject( $res );
+ }
+}