ApiQueryPagePropNames.php

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<?php
class ApiQueryPagePropNames extends ApiQueryBase {
 
    public function __construct( ApiQuery $query, $moduleName ) {
        parent::__construct( $query, $moduleName, 'ppn' );
    }
 
    public function getCacheMode( $params ) {
        return 'public';
    }
 
    public function execute() {
        $params = $this->extractRequestParams();
 
        $this->addTables( 'page_props' );
        $this->addFields( 'pp_propname' );
        $this->addOption( 'DISTINCT' );
        $this->addOption( 'ORDER BY', 'pp_propname' );
 
        if ( $params['continue'] ) {
            $cont = explode( '|', $params['continue'] );
            $this->dieContinueUsageIf( count( $cont ) != 1 );
 
            // Add a WHERE clause
            $this->addWhereRange( 'pp_propname', 'newer', $cont[0], null );
        }
 
        $limit = $params['limit'];
 
        // mysql has issues with limit in loose index T115825
        if ( $this->getDB()->getType() !== 'mysql' ) {
            $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->pp_propname );
                break;
            }
 
            $vals = [];
            $vals['propname'] = $row->pp_propname;
            $fit = $result->addValue( [ 'query', $this->getModuleName() ], null, $vals );
            if ( !$fit ) {
                $this->setContinueEnumParameter( 'continue', $row->pp_propname );
                break;
            }
        }
 
        $result->addIndexedTagName( [ 'query', $this->getModuleName() ], 'p' );
    }
 
    public function getAllowedParams() {
        return [
            'continue' => [
                ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
            ],
            'limit' => [
                ApiBase::PARAM_TYPE => 'limit',
                ApiBase::PARAM_DFLT => 10,
                ApiBase::PARAM_MIN => 1,
                ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
                ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
            ],
        ];
    }
 
    protected function getExamplesMessages() {
        return [
            'action=query&list=pagepropnames'
                => 'apihelp-query+pagepropnames-example-simple',
        ];
    }
 
    public function getHelpUrls() {
        return 'https://www.mediawiki.org/wiki/Special:MyLanguage/API:Pagepropnames';
    }
}