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563 lines
18 KiB
PHP
563 lines
18 KiB
PHP
<?php
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/**
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*
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*
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* Created on Oct 16, 2006
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*
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* Copyright © 2006 Yuri Astrakhan "<Firstname><Lastname>@gmail.com"
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* @file
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*/
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/**
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* This is a three-in-one module to query:
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* * backlinks - links pointing to the given page,
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* * embeddedin - what pages transclude the given page within themselves,
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* * imageusage - what pages use the given image
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*
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* @ingroup API
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*/
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class ApiQueryBacklinks extends ApiQueryGeneratorBase {
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/**
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* @var Title
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*/
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private $rootTitle;
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private $params, $contID, $redirID, $redirect;
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private $bl_ns, $bl_from, $bl_table, $bl_code, $bl_title, $bl_fields, $hasNS;
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/**
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* Maps ns and title to pageid
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*
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* @var array
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*/
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private $pageMap = array();
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private $resultArr;
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private $redirTitles = array();
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private $continueStr = null;
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// output element name, database column field prefix, database table
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private $backlinksSettings = array(
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'backlinks' => array(
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'code' => 'bl',
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'prefix' => 'pl',
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'linktbl' => 'pagelinks',
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'helpurl' => 'https://www.mediawiki.org/wiki/API:Backlinks',
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),
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'embeddedin' => array(
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'code' => 'ei',
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'prefix' => 'tl',
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'linktbl' => 'templatelinks',
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'helpurl' => 'https://www.mediawiki.org/wiki/API:Embeddedin',
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),
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'imageusage' => array(
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'code' => 'iu',
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'prefix' => 'il',
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'linktbl' => 'imagelinks',
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'helpurl' => 'https://www.mediawiki.org/wiki/API:Imageusage',
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)
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);
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public function __construct( $query, $moduleName ) {
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$settings = $this->backlinksSettings[$moduleName];
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$prefix = $settings['prefix'];
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$code = $settings['code'];
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$this->resultArr = array();
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parent::__construct( $query, $moduleName, $code );
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$this->bl_ns = $prefix . '_namespace';
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$this->bl_from = $prefix . '_from';
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$this->bl_table = $settings['linktbl'];
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$this->bl_code = $code;
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$this->helpUrl = $settings['helpurl'];
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$this->hasNS = $moduleName !== 'imageusage';
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if ( $this->hasNS ) {
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$this->bl_title = $prefix . '_title';
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$this->bl_fields = array(
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$this->bl_ns,
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$this->bl_title
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);
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} else {
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$this->bl_title = $prefix . '_to';
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$this->bl_fields = array(
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$this->bl_title
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);
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}
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}
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public function execute() {
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$this->run();
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}
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public function getCacheMode( $params ) {
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return 'public';
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}
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public function executeGenerator( $resultPageSet ) {
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$this->run( $resultPageSet );
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}
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/**
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* @param $resultPageSet ApiPageSet
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* @return void
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*/
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private function prepareFirstQuery( $resultPageSet = null ) {
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/* SELECT page_id, page_title, page_namespace, page_is_redirect
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* FROM pagelinks, page WHERE pl_from=page_id
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* AND pl_title='Foo' AND pl_namespace=0
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* LIMIT 11 ORDER BY pl_from
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*/
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$this->addTables( array( $this->bl_table, 'page' ) );
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$this->addWhere( "{$this->bl_from}=page_id" );
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if ( is_null( $resultPageSet ) ) {
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$this->addFields( array( 'page_id', 'page_title', 'page_namespace' ) );
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} else {
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$this->addFields( $resultPageSet->getPageTableFields() );
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}
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$this->addFields( 'page_is_redirect' );
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$this->addWhereFld( $this->bl_title, $this->rootTitle->getDBkey() );
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if ( $this->hasNS ) {
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$this->addWhereFld( $this->bl_ns, $this->rootTitle->getNamespace() );
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}
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$this->addWhereFld( 'page_namespace', $this->params['namespace'] );
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if ( !is_null( $this->contID ) ) {
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$op = $this->params['dir'] == 'descending' ? '<' : '>';
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$this->addWhere( "{$this->bl_from}$op={$this->contID}" );
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}
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if ( $this->params['filterredir'] == 'redirects' ) {
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$this->addWhereFld( 'page_is_redirect', 1 );
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} elseif ( $this->params['filterredir'] == 'nonredirects' && !$this->redirect ) {
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// bug 22245 - Check for !redirect, as filtering nonredirects, when getting what links to them is contradictory
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$this->addWhereFld( 'page_is_redirect', 0 );
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}
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$this->addOption( 'LIMIT', $this->params['limit'] + 1 );
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$sort = ( $this->params['dir'] == 'descending' ? ' DESC' : '' );
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$this->addOption( 'ORDER BY', $this->bl_from . $sort );
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$this->addOption( 'STRAIGHT_JOIN' );
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}
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/**
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* @param $resultPageSet ApiPageSet
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* @return void
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*/
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private function prepareSecondQuery( $resultPageSet = null ) {
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/* SELECT page_id, page_title, page_namespace, page_is_redirect, pl_title, pl_namespace
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FROM pagelinks, page WHERE pl_from=page_id
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AND (pl_title='Foo' AND pl_namespace=0) OR (pl_title='Bar' AND pl_namespace=1)
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ORDER BY pl_namespace, pl_title, pl_from LIMIT 11
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*/
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$db = $this->getDB();
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$this->addTables( array( 'page', $this->bl_table ) );
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$this->addWhere( "{$this->bl_from}=page_id" );
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if ( is_null( $resultPageSet ) ) {
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$this->addFields( array( 'page_id', 'page_title', 'page_namespace', 'page_is_redirect' ) );
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} else {
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$this->addFields( $resultPageSet->getPageTableFields() );
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}
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$this->addFields( $this->bl_title );
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if ( $this->hasNS ) {
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$this->addFields( $this->bl_ns );
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}
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// We can't use LinkBatch here because $this->hasNS may be false
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$titleWhere = array();
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$allRedirNs = array();
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$allRedirDBkey = array();
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/** @var $t Title */
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foreach ( $this->redirTitles as $t ) {
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$redirNs = $t->getNamespace();
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$redirDBkey = $t->getDBkey();
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$titleWhere[] = "{$this->bl_title} = " . $db->addQuotes( $redirDBkey ) .
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( $this->hasNS ? " AND {$this->bl_ns} = {$redirNs}" : '' );
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$allRedirNs[] = $redirNs;
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$allRedirDBkey[] = $redirDBkey;
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}
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$this->addWhere( $db->makeList( $titleWhere, LIST_OR ) );
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$this->addWhereFld( 'page_namespace', $this->params['namespace'] );
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if ( !is_null( $this->redirID ) ) {
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$op = $this->params['dir'] == 'descending' ? '<' : '>';
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/** @var $first Title */
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$first = $this->redirTitles[0];
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$title = $db->addQuotes( $first->getDBkey() );
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$ns = $first->getNamespace();
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$from = $this->redirID;
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if ( $this->hasNS ) {
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$this->addWhere( "{$this->bl_ns} $op $ns OR " .
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"({$this->bl_ns} = $ns AND " .
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"({$this->bl_title} $op $title OR " .
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"({$this->bl_title} = $title AND " .
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"{$this->bl_from} $op= $from)))" );
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} else {
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$this->addWhere( "{$this->bl_title} $op $title OR " .
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"({$this->bl_title} = $title AND " .
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"{$this->bl_from} $op= $from)" );
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}
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}
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if ( $this->params['filterredir'] == 'redirects' ) {
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$this->addWhereFld( 'page_is_redirect', 1 );
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} elseif ( $this->params['filterredir'] == 'nonredirects' ) {
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$this->addWhereFld( 'page_is_redirect', 0 );
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}
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$this->addOption( 'LIMIT', $this->params['limit'] + 1 );
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$orderBy = array();
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$sort = ( $this->params['dir'] == 'descending' ? ' DESC' : '' );
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// Don't order by namespace/title if it's constant in the WHERE clause
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if ( $this->hasNS && count( array_unique( $allRedirNs ) ) != 1 ) {
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$orderBy[] = $this->bl_ns . $sort;
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}
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if ( count( array_unique( $allRedirDBkey ) ) != 1 ) {
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$orderBy[] = $this->bl_title . $sort;
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}
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$orderBy[] = $this->bl_from . $sort;
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$this->addOption( 'ORDER BY', $orderBy );
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$this->addOption( 'USE INDEX', array( 'page' => 'PRIMARY' ) );
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}
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/**
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* @param $resultPageSet ApiPageSet
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* @return void
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*/
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private function run( $resultPageSet = null ) {
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$this->params = $this->extractRequestParams( false );
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$this->redirect = isset( $this->params['redirect'] ) && $this->params['redirect'];
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$userMax = ( $this->redirect ? ApiBase::LIMIT_BIG1 / 2 : ApiBase::LIMIT_BIG1 );
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$botMax = ( $this->redirect ? ApiBase::LIMIT_BIG2 / 2 : ApiBase::LIMIT_BIG2 );
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$result = $this->getResult();
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if ( $this->params['limit'] == 'max' ) {
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$this->params['limit'] = $this->getMain()->canApiHighLimits() ? $botMax : $userMax;
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$result->setParsedLimit( $this->getModuleName(), $this->params['limit'] );
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} else {
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$this->params['limit'] = intval( $this->params['limit'] );
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$this->validateLimit( 'limit', $this->params['limit'], 1, $userMax, $botMax );
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}
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$this->processContinue();
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$this->prepareFirstQuery( $resultPageSet );
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$res = $this->select( __METHOD__ . '::firstQuery' );
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$count = 0;
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foreach ( $res as $row ) {
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if ( ++ $count > $this->params['limit'] ) {
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// We've reached the one extra which shows that there are additional pages to be had. Stop here...
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// Continue string preserved in case the redirect query doesn't pass the limit
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$this->continueStr = $this->getContinueStr( $row->page_id );
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break;
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}
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if ( is_null( $resultPageSet ) ) {
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$this->extractRowInfo( $row );
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} else {
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$this->pageMap[$row->page_namespace][$row->page_title] = $row->page_id;
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if ( $row->page_is_redirect ) {
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$this->redirTitles[] = Title::makeTitle( $row->page_namespace, $row->page_title );
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}
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$resultPageSet->processDbRow( $row );
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}
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}
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if ( $this->redirect && count( $this->redirTitles ) ) {
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$this->resetQueryParams();
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$this->prepareSecondQuery( $resultPageSet );
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$res = $this->select( __METHOD__ . '::secondQuery' );
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$count = 0;
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foreach ( $res as $row ) {
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if ( ++$count > $this->params['limit'] ) {
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// We've reached the one extra which shows that there are additional pages to be had. Stop here...
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// We need to keep the parent page of this redir in
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if ( $this->hasNS ) {
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$parentID = $this->pageMap[$row->{$this->bl_ns}][$row->{$this->bl_title}];
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} else {
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$parentID = $this->pageMap[NS_FILE][$row->{$this->bl_title}];
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}
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$this->continueStr = $this->getContinueRedirStr( $parentID, $row->page_id );
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break;
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}
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if ( is_null( $resultPageSet ) ) {
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$this->extractRedirRowInfo( $row );
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} else {
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$resultPageSet->processDbRow( $row );
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}
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}
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}
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if ( is_null( $resultPageSet ) ) {
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// Try to add the result data in one go and pray that it fits
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$fit = $result->addValue( 'query', $this->getModuleName(), array_values( $this->resultArr ) );
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if ( !$fit ) {
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// It didn't fit. Add elements one by one until the
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// result is full.
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foreach ( $this->resultArr as $pageID => $arr ) {
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// Add the basic entry without redirlinks first
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$fit = $result->addValue(
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array( 'query', $this->getModuleName() ),
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null, array_diff_key( $arr, array( 'redirlinks' => '' ) ) );
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if ( !$fit ) {
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$this->continueStr = $this->getContinueStr( $pageID );
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break;
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}
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$hasRedirs = false;
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$redirLinks = isset( $arr['redirlinks'] ) ? $arr['redirlinks'] : array();
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foreach ( (array)$redirLinks as $key => $redir ) {
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$fit = $result->addValue(
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array( 'query', $this->getModuleName(), $pageID, 'redirlinks' ),
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$key, $redir );
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if ( !$fit ) {
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$this->continueStr = $this->getContinueRedirStr( $pageID, $redir['pageid'] );
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break;
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}
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$hasRedirs = true;
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}
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if ( $hasRedirs ) {
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$result->setIndexedTagName_internal(
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array( 'query', $this->getModuleName(), $pageID, 'redirlinks' ),
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$this->bl_code );
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}
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if ( !$fit ) {
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break;
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}
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}
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}
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$result->setIndexedTagName_internal(
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array( 'query', $this->getModuleName() ),
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$this->bl_code
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);
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}
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if ( !is_null( $this->continueStr ) ) {
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$this->setContinueEnumParameter( 'continue', $this->continueStr );
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}
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}
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private function extractRowInfo( $row ) {
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$this->pageMap[$row->page_namespace][$row->page_title] = $row->page_id;
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$t = Title::makeTitle( $row->page_namespace, $row->page_title );
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$a = array( 'pageid' => intval( $row->page_id ) );
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ApiQueryBase::addTitleInfo( $a, $t );
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if ( $row->page_is_redirect ) {
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$a['redirect'] = '';
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$this->redirTitles[] = $t;
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}
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// Put all the results in an array first
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$this->resultArr[$a['pageid']] = $a;
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}
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private function extractRedirRowInfo( $row ) {
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$a['pageid'] = intval( $row->page_id );
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ApiQueryBase::addTitleInfo( $a, Title::makeTitle( $row->page_namespace, $row->page_title ) );
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if ( $row->page_is_redirect ) {
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$a['redirect'] = '';
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}
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$ns = $this->hasNS ? $row->{$this->bl_ns} : NS_FILE;
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$parentID = $this->pageMap[$ns][$row->{$this->bl_title}];
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// Put all the results in an array first
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$this->resultArr[$parentID]['redirlinks'][] = $a;
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$this->getResult()->setIndexedTagName( $this->resultArr[$parentID]['redirlinks'], $this->bl_code );
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}
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protected function processContinue() {
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if ( !is_null( $this->params['continue'] ) ) {
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$this->parseContinueParam();
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} else {
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$this->rootTitle = $this->getTitleOrPageId( $this->params )->getTitle();
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}
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// only image titles are allowed for the root in imageinfo mode
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if ( !$this->hasNS && $this->rootTitle->getNamespace() !== NS_FILE ) {
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$this->dieUsage( "The title for {$this->getModuleName()} query must be an image", 'bad_image_title' );
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}
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}
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protected function parseContinueParam() {
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$continueList = explode( '|', $this->params['continue'] );
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// expected format:
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// ns | key | id1 [| id2]
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// ns+key: root title
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// id1: first-level page ID to continue from
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// id2: second-level page ID to continue from
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// null stuff out now so we know what's set and what isn't
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$this->rootTitle = $this->contID = $this->redirID = null;
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$rootNs = intval( $continueList[0] );
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$this->dieContinueUsageIf( $rootNs === 0 && $continueList[0] !== '0' );
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$this->rootTitle = Title::makeTitleSafe( $rootNs, $continueList[1] );
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$this->dieContinueUsageIf( !$this->rootTitle );
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$contID = intval( $continueList[2] );
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$this->dieContinueUsageIf( $contID === 0 && $continueList[2] !== '0' );
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$this->contID = $contID;
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$id2 = isset( $continueList[3] ) ? $continueList[3] : null;
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$redirID = intval( $id2 );
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if ( $redirID === 0 && $id2 !== '0' ) {
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// This one isn't required
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return;
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}
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$this->redirID = $redirID;
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}
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protected function getContinueStr( $lastPageID ) {
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return $this->rootTitle->getNamespace() .
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'|' . $this->rootTitle->getDBkey() .
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'|' . $lastPageID;
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}
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protected function getContinueRedirStr( $lastPageID, $lastRedirID ) {
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return $this->getContinueStr( $lastPageID ) . '|' . $lastRedirID;
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}
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public function getAllowedParams() {
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$retval = array(
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'title' => array(
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ApiBase::PARAM_TYPE => 'string',
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),
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'pageid' => array(
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ApiBase::PARAM_TYPE => 'integer',
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),
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'continue' => null,
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'namespace' => array(
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ApiBase::PARAM_ISMULTI => true,
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ApiBase::PARAM_TYPE => 'namespace'
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),
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'dir' => array(
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ApiBase::PARAM_DFLT => 'ascending',
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ApiBase::PARAM_TYPE => array(
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'ascending',
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|
'descending'
|
|
)
|
|
),
|
|
'filterredir' => array(
|
|
ApiBase::PARAM_DFLT => 'all',
|
|
ApiBase::PARAM_TYPE => array(
|
|
'all',
|
|
'redirects',
|
|
'nonredirects'
|
|
)
|
|
),
|
|
'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
|
|
)
|
|
);
|
|
if ( $this->getModuleName() == 'embeddedin' ) {
|
|
return $retval;
|
|
}
|
|
$retval['redirect'] = false;
|
|
return $retval;
|
|
}
|
|
|
|
public function getParamDescription() {
|
|
$retval = array(
|
|
'title' => "Title to search. Cannot be used together with {$this->bl_code}pageid",
|
|
'pageid' => "Pageid to search. Cannot be used together with {$this->bl_code}title",
|
|
'continue' => 'When more results are available, use this to continue',
|
|
'namespace' => 'The namespace to enumerate',
|
|
'dir' => 'The direction in which to list',
|
|
);
|
|
if ( $this->getModuleName() != 'embeddedin' ) {
|
|
return array_merge( $retval, array(
|
|
'redirect' => 'If linking page is a redirect, find all pages that link to that redirect as well. Maximum limit is halved.',
|
|
'filterredir' => "How to filter for redirects. If set to nonredirects when {$this->bl_code}redirect is enabled, this is only applied to the second level",
|
|
'limit' => "How many total pages to return. If {$this->bl_code}redirect is enabled, limit applies to each level separately (which means you may get up to 2 * limit results)."
|
|
) );
|
|
}
|
|
return array_merge( $retval, array(
|
|
'filterredir' => 'How to filter for redirects',
|
|
'limit' => 'How many total pages to return'
|
|
) );
|
|
}
|
|
|
|
public function getResultProperties() {
|
|
return array(
|
|
'' => array(
|
|
'pageid' => 'integer',
|
|
'ns' => 'namespace',
|
|
'title' => 'string',
|
|
'redirect' => 'boolean'
|
|
)
|
|
);
|
|
}
|
|
|
|
public function getDescription() {
|
|
switch ( $this->getModuleName() ) {
|
|
case 'backlinks':
|
|
return 'Find all pages that link to the given page';
|
|
case 'embeddedin':
|
|
return 'Find all pages that embed (transclude) the given title';
|
|
case 'imageusage':
|
|
return 'Find all pages that use the given image title.';
|
|
default:
|
|
ApiBase::dieDebug( __METHOD__, 'Unknown module name' );
|
|
}
|
|
}
|
|
|
|
public function getPossibleErrors() {
|
|
return array_merge( parent::getPossibleErrors(),
|
|
$this->getTitleOrPageIdErrorMessage(),
|
|
array(
|
|
array( 'code' => 'bad_image_title', 'info' => "The title for {$this->getModuleName()} query must be an image" ),
|
|
)
|
|
);
|
|
}
|
|
|
|
public function getExamples() {
|
|
static $examples = array(
|
|
'backlinks' => array(
|
|
'api.php?action=query&list=backlinks&bltitle=Main%20Page',
|
|
'api.php?action=query&generator=backlinks&gbltitle=Main%20Page&prop=info'
|
|
),
|
|
'embeddedin' => array(
|
|
'api.php?action=query&list=embeddedin&eititle=Template:Stub',
|
|
'api.php?action=query&generator=embeddedin&geititle=Template:Stub&prop=info'
|
|
),
|
|
'imageusage' => array(
|
|
'api.php?action=query&list=imageusage&iutitle=File:Albert%20Einstein%20Head.jpg',
|
|
'api.php?action=query&generator=imageusage&giutitle=File:Albert%20Einstein%20Head.jpg&prop=info'
|
|
)
|
|
);
|
|
|
|
return $examples[$this->getModuleName()];
|
|
}
|
|
|
|
public function getHelpUrls() {
|
|
return $this->helpUrl;
|
|
}
|
|
}
|