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<?php
namespace CirrusSearch\Query;
use CirrusSearch\CrossSearchStrategy;
use CirrusSearch\Parser\AST\KeywordFeatureNode;
use CirrusSearch\Query\Builder\QueryBuildingContext;
use CirrusSearch\Search\SearchContext;
use Elastica\Query\AbstractQuery;
/**
 * Filters the result set based on pages containing outgoing wiki links to the
 * provided page title.
 *
 * Examples:
 *   linksto:"Wake Island"
 *   linksto:Wake_Island
 *   linksto:Shanghai
 */
class LinksToFeature extends SimpleKeywordFeature implements FilterQueryFeature {
    /**
     * @return string[]
     */
    protected function getKeywords() {
        return [ 'linksto' ];
    }
    /**
     * @param KeywordFeatureNode $node
     * @return CrossSearchStrategy
     */
    public function getCrossSearchStrategy( KeywordFeatureNode $node ) {
        return CrossSearchStrategy::allWikisStrategy();
    }
    /**
     * @param SearchContext $context
     * @param string $key The keyword
     * @param string $value The value attached to the keyword with quotes stripped
     * @param string $quotedValue The original value in the search string, including quotes if used
     * @param bool $negated Is the search negated? Not used to generate the returned AbstractQuery,
     *  that will be negated as necessary. Used for any other building/context necessary.
     * @return array Two element array, first an AbstractQuery or null to apply to the
     *  query. Second a boolean indicating if the quotedValue should be kept in the search
     *  string.
     */
    protected function doApply( SearchContext $context, $key, $value, $quotedValue, $negated ) {
        return [ $this->doGetFilterQuery( $value ), false ];
    }
    /**
     * @param KeywordFeatureNode $node
     * @param QueryBuildingContext $context
     * @return AbstractQuery|null
     */
    public function getFilterQuery( KeywordFeatureNode $node, QueryBuildingContext $context ) {
        return $this->doGetFilterQuery( $node->getValue() );
    }
    /**
     * @param string $value
     * @return \Elastica\Query\MatchQuery
     */
    protected function doGetFilterQuery( $value ) {
        return QueryHelper::matchPage( 'outgoing_link', $value, true );
    }
}