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<?php
/**
*
*
* Created on May 12, 2007
*
* Copyright © 2006 Yuri Astrakhan "<Firstname><Lastname>@gmail.com"
*
* 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
*/
/**
* A query module to list all wiki links on a given set of pages.
*
* @ingroup API
*/
class ApiQueryLinks extends ApiQueryGeneratorBase {
const LINKS = 'links';
const TEMPLATES = 'templates';
private $table, $prefix, $description, $helpUrl;
public function __construct( $query, $moduleName ) {
switch ( $moduleName ) {
case self::LINKS:
$this->table = 'pagelinks';
$this->prefix = 'pl';
$this->description = 'link';
$this->titlesParam = 'titles';
$this->titlesParamDescription = 'Only list links to these titles. Useful for checking whether a certain page links to a certain title.';
$this->helpUrl = 'https://www.mediawiki.org/wiki/API:Properties#links_.2F_pl';
break;
case self::TEMPLATES:
$this->table = 'templatelinks';
$this->prefix = 'tl';
$this->description = 'template';
$this->titlesParam = 'templates';
$this->titlesParamDescription = 'Only list these templates. Useful for checking whether a certain page uses a certain template.';
$this->helpUrl = 'https://www.mediawiki.org/wiki/API:Properties#templates_.2F_tl';
break;
default:
ApiBase::dieDebug( __METHOD__, 'Unknown module name' );
}
parent::__construct( $query, $moduleName, $this->prefix );
}
public function execute() {
$this->run();
}
public function getCacheMode( $params ) {
return 'public';
}
public function executeGenerator( $resultPageSet ) {
$this->run( $resultPageSet );
}
/**
* @param $resultPageSet ApiPageSet
* @return
*/
private function run( $resultPageSet = null ) {
if ( $this->getPageSet()->getGoodTitleCount() == 0 ) {
return; // nothing to do
}
$params = $this->extractRequestParams();
$this->addFields( array(
'pl_from' => $this->prefix . '_from',
'pl_namespace' => $this->prefix . '_namespace',
'pl_title' => $this->prefix . '_title'
) );
$this->addTables( $this->table );
$this->addWhereFld( $this->prefix . '_from', array_keys( $this->getPageSet()->getGoodTitles() ) );
$this->addWhereFld( $this->prefix . '_namespace', $params['namespace'] );
if ( !is_null( $params[$this->titlesParam] ) ) {
$lb = new LinkBatch;
foreach ( $params[$this->titlesParam] as $t ) {
$title = Title::newFromText( $t );
if ( !$title ) {
$this->setWarning( "\"$t\" is not a valid title" );
} else {
$lb->addObj( $title );
}
}
$cond = $lb->constructSet( $this->prefix, $this->getDB() );
if ( $cond ) {
$this->addWhere( $cond );
}
}
if ( !is_null( $params['continue'] ) ) {
$cont = explode( '|', $params['continue'] );
$this->dieContinueUsageIf( count( $cont ) != 3 );
$op = $params['dir'] == 'descending' ? '<' : '>';
$plfrom = intval( $cont[0] );
$plns = intval( $cont[1] );
$pltitle = $this->getDB()->addQuotes( $cont[2] );
$this->addWhere(
"{$this->prefix}_from $op $plfrom OR " .
"({$this->prefix}_from = $plfrom AND " .
"({$this->prefix}_namespace $op $plns OR " .
"({$this->prefix}_namespace = $plns AND " .
"{$this->prefix}_title $op= $pltitle)))"
);
}
$sort = ( $params['dir'] == 'descending' ? ' DESC' : '' );
// Here's some MySQL craziness going on: if you use WHERE foo='bar'
// and later ORDER BY foo MySQL doesn't notice the ORDER BY is pointless
// but instead goes and filesorts, because the index for foo was used
// already. To work around this, we drop constant fields in the WHERE
// clause from the ORDER BY clause
$order = array();
if ( count( $this->getPageSet()->getGoodTitles() ) != 1 ) {
$order[] = $this->prefix . '_from' . $sort;
}
if ( count( $params['namespace'] ) != 1 ) {
$order[] = $this->prefix . '_namespace' . $sort;
}
$order[] = $this->prefix . '_title' . $sort;
$this->addOption( 'ORDER BY', $order );
$this->addOption( 'USE INDEX', $this->prefix . '_from' );
$this->addOption( 'LIMIT', $params['limit'] + 1 );
$res = $this->select( __METHOD__ );
if ( is_null( $resultPageSet ) ) {
$count = 0;
foreach ( $res as $row ) {
if ( ++$count > $params['limit'] ) {
// We've reached the one extra which shows that
// there are additional pages to be had. Stop here...
$this->setContinueEnumParameter( 'continue',
"{$row->pl_from}|{$row->pl_namespace}|{$row->pl_title}" );
break;
}
$vals = array();
ApiQueryBase::addTitleInfo( $vals, Title::makeTitle( $row->pl_namespace, $row->pl_title ) );
$fit = $this->addPageSubItem( $row->pl_from, $vals );
if ( !$fit ) {
$this->setContinueEnumParameter( 'continue',
"{$row->pl_from}|{$row->pl_namespace}|{$row->pl_title}" );
break;
}
}
} else {
$titles = array();
$count = 0;
foreach ( $res as $row ) {
if ( ++$count > $params['limit'] ) {
// We've reached the one extra which shows that
// there are additional pages to be had. Stop here...
$this->setContinueEnumParameter( 'continue',
"{$row->pl_from}|{$row->pl_namespace}|{$row->pl_title}" );
break;
}
$titles[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
}
$resultPageSet->populateFromTitles( $titles );
}
}
public function getAllowedParams() {
return array(
'namespace' => array(
ApiBase::PARAM_TYPE => 'namespace',
ApiBase::PARAM_ISMULTI => true
),
'limit' => array(
ApiBase::PARAM_DFLT => 10,
ApiBase::PARAM_TYPE => 'limit',
ApiBase::PARAM_MIN => 1,
ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
),
'continue' => null,
$this->titlesParam => array(
ApiBase::PARAM_ISMULTI => true,
),
'dir' => array(
ApiBase::PARAM_DFLT => 'ascending',
ApiBase::PARAM_TYPE => array(
'ascending',
'descending'
)
),
);
}
public function getParamDescription() {
$desc = $this->description;
return array(
'namespace' => "Show {$desc}s in this namespace(s) only",
'limit' => "How many {$desc}s to return",
'continue' => 'When more results are available, use this to continue',
$this->titlesParam => $this->titlesParamDescription,
'dir' => 'The direction in which to list',
);
}
public function getResultProperties() {
return array(
'' => array(
'ns' => 'namespace',
'title' => 'string'
)
);
}
public function getDescription() {
return "Returns all {$this->description}s from the given page(s)";
}
public function getExamples() {
$desc = $this->description;
$name = $this->getModuleName();
return array(
"api.php?action=query&prop={$name}&titles=Main%20Page" => "Get {$desc}s from the [[Main Page]]",
"api.php?action=query&generator={$name}&titles=Main%20Page&prop=info" => "Get information about the {$desc} pages in the [[Main Page]]",
"api.php?action=query&prop={$name}&titles=Main%20Page&{$this->prefix}namespace=2|10" => "Get {$desc}s from the Main Page in the User and Template namespaces",
);
}
public function getHelpUrls() {
return $this->helpUrl;
}
}
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