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mediawiki/includes/specials/SpecialRecentchangeslinked.php
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SpecialRecentchangeslinked.php
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<?php
/**
* Implements Special:Recentchangeslinked
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @ingroup SpecialPage
*/
/**
* This is to display changes made to all articles linked in an article.
*
* @ingroup SpecialPage
*/
class SpecialRecentChangesLinked extends SpecialRecentChanges {
/** @var bool|Title */
protected $rclTargetTitle;
function __construct() {
parent::__construct( 'Recentchangeslinked' );
}
public function getDefaultOptions() {
$opts = parent::getDefaultOptions();
$opts->add( 'target', '' );
$opts->add( 'showlinkedto', false );
return $opts;
}
public function parseParameters( $par, FormOptions $opts ) {
$opts['target'] = $par;
}
public function doMainQuery( $conds, $opts ) {
$target = $opts['target'];
$showlinkedto = $opts['showlinkedto'];
$limit = $opts['limit'];
if ( $target === '' ) {
return false;
}
$outputPage = $this->getOutput();
$title = Title::newFromURL( $target );
if ( !$title || $title->isExternal() ) {
$outputPage->addHtml( '<div class="errorbox">' . $this->msg( 'allpagesbadtitle' )
->parse() . '</div>' );
return false;
}
$outputPage->setPageTitle( $this->msg( 'recentchangeslinked-title', $title->getPrefixedText() ) );
/*
* Ordinary links are in the pagelinks table, while transclusions are
* in the templatelinks table, categorizations in categorylinks and
* image use in imagelinks. We need to somehow combine all these.
* Special:Whatlinkshere does this by firing multiple queries and
* merging the results, but the code we inherit from our parent class
* expects only one result set so we use UNION instead.
*/
$dbr = wfGetDB( DB_SLAVE, 'recentchangeslinked' );
$id = $title->getArticleID();
$ns = $title->getNamespace();
$dbkey = $title->getDBkey();
$tables = array( 'recentchanges' );
$select = RecentChange::selectFields();
$join_conds = array();
$query_options = array();
// left join with watchlist table to highlight watched rows
$uid = $this->getUser()->getId();
if ( $uid && $this->getUser()->isAllowed( 'viewmywatchlist' ) ) {
$tables[] = 'watchlist';
$select[] = 'wl_user';
$join_conds['watchlist'] = array( 'LEFT JOIN', array(
'wl_user' => $uid,
'wl_title=rc_title',
'wl_namespace=rc_namespace'
) );
}
if ( $this->getUser()->isAllowed( 'rollback' ) ) {
$tables[] = 'page';
$join_conds['page'] = array( 'LEFT JOIN', 'rc_cur_id=page_id' );
$select[] = 'page_latest';
}
ChangeTags::modifyDisplayQuery(
$tables,
$select,
$conds,
$join_conds,
$query_options,
$opts['tagfilter']
);
if ( !$this->runMainQueryHook( $tables, $select, $conds, $query_options, $join_conds,
$opts )
) {
return false;
}
if ( $ns == NS_CATEGORY && !$showlinkedto ) {
// special handling for categories
// XXX: should try to make this less kludgy
$link_tables = array( 'categorylinks' );
$showlinkedto = true;
} else {
// for now, always join on these tables; really should be configurable as in whatlinkshere
$link_tables = array( 'pagelinks', 'templatelinks' );
// imagelinks only contains links to pages in NS_FILE
if ( $ns == NS_FILE || !$showlinkedto ) {
$link_tables[] = 'imagelinks';
}
}
if ( $id == 0 && !$showlinkedto ) {
return false; // nonexistent pages can't link to any pages
}
// field name prefixes for all the various tables we might want to join with
$prefix = array(
'pagelinks' => 'pl',
'templatelinks' => 'tl',
'categorylinks' => 'cl',
'imagelinks' => 'il'
);
$subsql = array(); // SELECT statements to combine with UNION
foreach ( $link_tables as $link_table ) {
$pfx = $prefix[$link_table];
// imagelinks and categorylinks tables have no xx_namespace field,
// and have xx_to instead of xx_title
if ( $link_table == 'imagelinks' ) {
$link_ns = NS_FILE;
} elseif ( $link_table == 'categorylinks' ) {
$link_ns = NS_CATEGORY;
} else {
$link_ns = 0;
}
if ( $showlinkedto ) {
// find changes to pages linking to this page
if ( $link_ns ) {
if ( $ns != $link_ns ) {
continue;
} // should never happen, but check anyway
$subconds = array( "{$pfx}_to" => $dbkey );
} else {
$subconds = array( "{$pfx}_namespace" => $ns, "{$pfx}_title" => $dbkey );
}
$subjoin = "rc_cur_id = {$pfx}_from";
} else {
// find changes to pages linked from this page
$subconds = array( "{$pfx}_from" => $id );
if ( $link_table == 'imagelinks' || $link_table == 'categorylinks' ) {
$subconds["rc_namespace"] = $link_ns;
$subjoin = "rc_title = {$pfx}_to";
} else {
$subjoin = array( "rc_namespace = {$pfx}_namespace", "rc_title = {$pfx}_title" );
}
}
if ( $dbr->unionSupportsOrderAndLimit() ) {
$order = array( 'ORDER BY' => 'rc_timestamp DESC' );
} else {
$order = array();
}
$query = $dbr->selectSQLText(
array_merge( $tables, array( $link_table ) ),
$select,
$conds + $subconds,
__METHOD__,
$order + $query_options,
$join_conds + array( $link_table => array( 'INNER JOIN', $subjoin ) )
);
if ( $dbr->unionSupportsOrderAndLimit() ) {
$query = $dbr->limitResult( $query, $limit );
}
$subsql[] = $query;
}
if ( count( $subsql ) == 0 ) {
return false; // should never happen
}
if ( count( $subsql ) == 1 && $dbr->unionSupportsOrderAndLimit() ) {
$sql = $subsql[0];
} else {
// need to resort and relimit after union
$sql = $dbr->unionQueries( $subsql, false ) . ' ORDER BY rc_timestamp DESC';
$sql = $dbr->limitResult( $sql, $limit, false );
}
$res = $dbr->query( $sql, __METHOD__ );
if ( $res->numRows() == 0 ) {
$this->mResultEmpty = true;
}
return $res;
}
function setTopText( FormOptions $opts ) {
$target = $this->getTargetTitle();
if ( $target ) {
$this->getOutput()->addBacklinkSubtitle( $target );
$this->getSkin()->setRelevantTitle( $target );
}
}
/**
* Get options to be displayed in a form
*
* @param FormOptions $opts
* @return array
*/
function getExtraOptions( $opts ) {
$extraOpts = parent::getExtraOptions( $opts );
$opts->consumeValues( array( 'showlinkedto', 'target' ) );
$extraOpts['target'] = array( $this->msg( 'recentchangeslinked-page' )->escaped(),
Xml::input( 'target', 40, str_replace( '_', ' ', $opts['target'] ) ) .
Xml::check( 'showlinkedto', $opts['showlinkedto'], array( 'id' => 'showlinkedto' ) ) . ' ' .
Xml::label( $this->msg( 'recentchangeslinked-to' )->text(), 'showlinkedto' ) );
return $extraOpts;
}
/**
* @return Title
*/
function getTargetTitle() {
if ( $this->rclTargetTitle === null ) {
$opts = $this->getOptions();
if ( isset( $opts['target'] ) && $opts['target'] !== '' ) {
$this->rclTargetTitle = Title::newFromText( $opts['target'] );
} else {
$this->rclTargetTitle = false;
}
}
return $this->rclTargetTitle;
}
}
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