ApiQueryPagesWithProp.php

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<?php
class ApiQueryPagesWithProp extends ApiQueryGeneratorBase {

        public function __construct( $query, $moduleName ) {
                parent::__construct( $query, $moduleName, 'pwp' );
        }

        public function execute() {
                $this->run();
        }

        public function getCacheMode( $params ) {
                return 'public';
        }

        public function executeGenerator( $resultPageSet ) {
                $this->run( $resultPageSet );
        }

        private function run( $resultPageSet = null ) {
                $params = $this->extractRequestParams();

                $prop = array_flip( $params['prop'] );
                $fld_ids = isset( $prop['ids'] );
                $fld_title = isset( $prop['title'] );
                $fld_value = isset( $prop['value'] );

                if ( $resultPageSet === null ) {
                        $this->addFields( array( 'page_id' ) );
                        $this->addFieldsIf( array( 'page_title', 'page_namespace' ), $fld_title );
                        $this->addFieldsIf( 'pp_value', $fld_value );
                } else {
                        $this->addFields( $resultPageSet->getPageTableFields() );
                }
                $this->addTables( array( 'page_props', 'page' ) );
                $this->addWhere( 'pp_page=page_id' );
                $this->addWhereFld( 'pp_propname', $params['propname'] );

                $dir = ( $params['dir'] == 'ascending' ) ? 'newer' : 'older';

                if ( $params['continue'] ) {
                        $cont = explode( '|', $params['continue'] );
                        $this->dieContinueUsageIf( count( $cont ) != 1 );

                        // Add a WHERE clause
                        $from = (int)$cont[0];
                        $this->addWhereRange( 'pp_page', $dir, $from, null );
                }

                $sort = ( $params['dir'] === 'descending' ? ' DESC' : '' );
                $this->addOption( 'ORDER BY', 'pp_page' . $sort );

                $limit = $params['limit'];
                $this->addOption( 'LIMIT', $limit + 1 );

                $result = $this->getResult();
                $count = 0;
                foreach ( $this->select( __METHOD__ ) as $row ) {
                        if ( ++$count > $limit ) {
                                // We've reached the one extra which shows that there are additional pages to be had. Stop here...
                                $this->setContinueEnumParameter( 'continue', $row->page_id );
                                break;
                        }

                        if ( $resultPageSet === null ) {
                                $vals = array();
                                if ( $fld_ids ) {
                                        $vals['pageid'] = (int)$row->page_id;
                                }
                                if ( $fld_title ) {
                                        $title = Title::makeTitle( $row->page_namespace, $row->page_title );
                                        ApiQueryBase::addTitleInfo( $vals, $title );
                                }
                                if ( $fld_value ) {
                                        $vals['value'] = $row->pp_value;
                                }
                                $fit = $result->addValue( array( 'query', $this->getModuleName() ), null, $vals );
                                if ( !$fit ) {
                                        $this->setContinueEnumParameter( 'continue', $row->page_id );
                                        break;
                                }
                        } else {
                                $resultPageSet->processDbRow( $row );
                        }
                }

                if ( $resultPageSet === null ) {
                        $result->setIndexedTagName_internal( array( 'query', $this->getModuleName() ), 'page' );
                }
        }

        public function getAllowedParams() {
                return array(
                        'propname' => array(
                                ApiBase::PARAM_TYPE => 'string',
                                ApiBase::PARAM_REQUIRED => true,
                        ),
                        'prop' => array(
                                ApiBase::PARAM_DFLT => 'ids|title',
                                ApiBase::PARAM_ISMULTI => true,
                                ApiBase::PARAM_TYPE => array (
                                        'ids',
                                        'title',
                                        'value',
                                )
                        ),
                        'continue' => null,
                        'limit' => array(
                                ApiBase::PARAM_TYPE => 'limit',
                                ApiBase::PARAM_DFLT => 10,
                                ApiBase::PARAM_MIN => 1,
                                ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
                                ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
                        ),
                        'dir' => array(
                                ApiBase::PARAM_DFLT => 'ascending',
                                ApiBase::PARAM_TYPE => array(
                                        'ascending',
                                        'descending',
                                )
                        ),
                );
        }

        public function getParamDescription() {
                return array(
                        'propname' => 'Page prop for which to enumerate pages',
                        'prop' => array(
                                'What pieces of information to include',
                                ' ids   - Adds the page ID',
                                ' title - Adds the title and namespace ID of the page',
                                ' value - Adds the value of the page prop',
                        ),
                        'dir' => 'In which direction to sort',
                        'continue' => 'When more results are available, use this to continue',
                        'limit' => 'The maximum number of pages to return',
                );
        }

        public function getDescription() {
                return 'List all pages using a given page prop';
        }

        public function getExamples() {
                return array(
                        'api.php?action=query&list=pageswithprop&pwppropname=displaytitle&pwpprop=ids|title|value' => 'Get first 10 pages using {{DISPLAYTITLE:}}',
                        'api.php?action=query&generator=pageswithprop&gpwppropname=notoc&prop=info' => 'Get page info about first 10 pages using __NOTOC__',
                );
        }

        public function getHelpUrls() {
                return 'https://www.mediawiki.org/wiki/API:Pageswithprop';
        }
}