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1<?php
2
3namespace CirrusSearch\Query;
4
5use CirrusSearch\CrossSearchStrategy;
6use CirrusSearch\Parser\AST\KeywordFeatureNode;
7use CirrusSearch\Query\Builder\QueryBuildingContext;
8use CirrusSearch\Search\SearchContext;
9use Elastica\Query\AbstractQuery;
10
11/**
12 * Filters the result set based on pages containing outgoing wiki links to the
13 * provided page title.
14 *
15 * Examples:
16 *   linksto:"Wake Island"
17 *   linksto:Wake_Island
18 *   linksto:Shanghai
19 */
20class LinksToFeature extends SimpleKeywordFeature implements FilterQueryFeature {
21    /**
22     * @return string[]
23     */
24    protected function getKeywords() {
25        return [ 'linksto' ];
26    }
27
28    /**
29     * @param KeywordFeatureNode $node
30     * @return CrossSearchStrategy
31     */
32    public function getCrossSearchStrategy( KeywordFeatureNode $node ) {
33        return CrossSearchStrategy::allWikisStrategy();
34    }
35
36    /**
37     * @param SearchContext $context
38     * @param string $key The keyword
39     * @param string $value The value attached to the keyword with quotes stripped
40     * @param string $quotedValue The original value in the search string, including quotes if used
41     * @param bool $negated Is the search negated? Not used to generate the returned AbstractQuery,
42     *  that will be negated as necessary. Used for any other building/context necessary.
43     * @return array Two element array, first an AbstractQuery or null to apply to the
44     *  query. Second a boolean indicating if the quotedValue should be kept in the search
45     *  string.
46     */
47    protected function doApply( SearchContext $context, $key, $value, $quotedValue, $negated ) {
48        return [ $this->doGetFilterQuery( $value ), false ];
49    }
50
51    /**
52     * @param KeywordFeatureNode $node
53     * @param QueryBuildingContext $context
54     * @return AbstractQuery|null
55     */
56    public function getFilterQuery( KeywordFeatureNode $node, QueryBuildingContext $context ) {
57        return $this->doGetFilterQuery( $node->getValue() );
58    }
59
60    /**
61     * @param string $value
62     * @return \Elastica\Query\MatchQuery
63     */
64    protected function doGetFilterQuery( $value ) {
65        return QueryHelper::matchPage( 'outgoing_link', $value, true );
66    }
67
68}