SemanticMediaWiki/includes/SMW_Record_Descriptions.php

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<?php
class SMWRecordDescription extends SMWConjunction {

        public function getQueryString( $asvalue = false ) {
                if ( !$asvalue ) {
                        return ''; // give up; SMWRecordDescriptions must always be values
                }
                $fields = array();
                $maxpos = - 1;
                foreach ( $this->m_descriptions as $desc ) {
                        if ( $desc instanceof SMWRecordFieldDescription ) { // everything else would be a bug; ignore
                                $fields[$desc->getPosition()] = $desc->getDescription()->getQueryString( true );
                                if ( $maxpos < $desc->getPosition() ) {
                                        $maxpos = $desc->getPosition();
                                }
                        }
                }
                if ( $maxpos < 0 ) {
                        return '+';
                } else {
                        $result = '';
                        for ( $i = 0; $i <= $maxpos; $i++ ) {
                                $result .= ( $result != '' ? '; ' : '' ) . ( array_key_exists( $i, $fields ) ? $fields[$i] : '?' );
                        }
                        return $result;
                }
        }

        public function prune( &$maxsize, &$maxdepth, &$log ) {
                if ( $maxsize <= 0 ) {
                        $log[] = $this->getQueryString();
                        return new SMWThingDescription();
                }
                $prunelog = array();
                $newdepth = $maxdepth;
                $result = new SMWRecordDescription();
                foreach ( $this->m_descriptions as $desc ) {
                        $restdepth = $maxdepth;
                        $result->addDescription( $desc->prune( $maxsize, $restdepth, $prunelog ) );
                        $newdepth = min( $newdepth, $restdepth );
                }
                if ( count( $result->getDescriptions() ) > 0 ) {
                        $log = array_merge( $log, $prunelog );
                        $maxdepth = $newdepth;
                        if ( count( $result->getDescriptions() ) == 1 ) { // simplify unary conjunctions!
                                $descriptions = $result->getDescriptions();
                                $result = array_shift( $descriptions );
                        }
                        $result->setPrintRequests( $this->getPrintRequests() );
                        return $result;
                } else {
                        $log[] = $this->getQueryString();
                        $result = new SMWThingDescription();
                        $result->setPrintRequests( $this->getPrintRequests() );
                        return $result;
                }
        }
}

class SMWRecordFieldDescription extends SMWSomeProperty {
        protected $m_position;

        public function __construct( $position, SMWDescription $description ) {
                parent::__construct( new SMWDIProperty( '_' . ( $position + 1 ) ), $description );
                $this->m_position = $position;
        }

        public function getPosition() {
                return $this->m_position;
        }

        public function getQueryString( $asvalue = false ) {
                if ( !$asvalue ) {
                        return '';  // give up; SMWRecordFieldDescriptions must always be values
                }
                $prefix = '';
                for ( $i = 0; $i < $this->m_position; $i++ ) {
                        $prefix .= '?; ';
                }
                return $prefix . $this->m_description->getQueryString( true );
        }

        public function prune( &$maxsize, &$maxdepth, &$log ) {
                if ( ( $maxsize <= 0 ) || ( $maxdepth <= 0 ) ) {
                        $log[] = $this->getQueryString();
                        return new SMWThingDescription();
                }
                $maxsize--;
                $maxdepth--;
                $result = new SMWRecordFieldDescription( $this->m_position, $this->m_description->prune( $maxsize, $maxdepth, $log ) );
                $result->setPrintRequests( $this->getPrintRequests() );
                return $result;
        }
}

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