SpecialPagesWithProp.php

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<?php
class SpecialPagesWithProp extends QueryPage {
        private $propName = null;

        function __construct( $name = 'PagesWithProp' ) {
                parent::__construct( $name );
        }

        function isCacheable() {
                return false;
        }

        function execute( $par ) {
                $this->setHeaders();
                $this->outputHeader();

                $request = $this->getRequest();
                $propname = $request->getVal( 'propname', $par );

                $dbr = wfGetDB( DB_SLAVE );
                $res = $dbr->select(
                        'page_props',
                        'pp_propname',
                        '',
                        __METHOD__,
                        array( 'DISTINCT', 'ORDER BY' => 'pp_propname' )
                );
                foreach ( $res as $row ) {
                        $propnames[$row->pp_propname] = $row->pp_propname;
                }

                $form = new HTMLForm( array(
                        'propname' => array(
                                'type' => 'selectorother',
                                'name' => 'propname',
                                'options' => $propnames,
                                'default' => $propname,
                                'label-message' => 'pageswithprop-prop',
                                'required' => true,
                        ),
                ), $this->getContext() );
                $form->setMethod( 'get' );
                $form->setAction( $this->getTitle()->getFullUrl() );
                $form->setSubmitCallback( array( $this, 'onSubmit' ) );
                $form->setWrapperLegend( $this->msg( 'pageswithprop-legend' ) );
                $form->addHeaderText( $this->msg( 'pageswithprop-text' )->parseAsBlock() );
                $form->setSubmitTextMsg( 'pageswithprop-submit' );

                $form->prepareForm();
                $form->displayForm( false );
                if ( $propname !== '' && $propname !== null ) {
                        $form->trySubmit();
                }
        }

        public function onSubmit( $data, $form ) {
                $this->propName = $data['propname'];
                parent::execute( $data['propname'] );
        }

        function isSyndicated() {
                return false;
        }

        function getQueryInfo() {
                return array(
                        'tables' => array( 'page_props', 'page' ),
                        'fields' => array(
                                'page_id' => 'pp_page',
                                'page_namespace',
                                'page_title',
                                'page_len',
                                'page_is_redirect',
                                'page_latest',
                                'pp_value',
                        ),
                        'conds' => array(
                                'page_id = pp_page',
                                'pp_propname' => $this->propName,
                        ),
                        'options' => array()
                );
        }

        function getOrderFields() {
                return array( 'page_id' );
        }

        function formatResult( $skin, $result ) {
                $title = Title::newFromRow( $result );
                $ret = Linker::link( $title, null, array(), array(), array( 'known' ) );
                if ( $result->pp_value !== '' ) {
                        $value = $this->msg( 'parentheses' )
                                ->rawParams( Xml::span( $result->pp_value, 'prop-value' ) )
                                ->escaped();
                        $ret .= " $value";
                }
                return $ret;
        }

        protected function getGroupName() {
                return 'pages';
        }
}