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| 1 | <?php |
| 2 | |
| 3 | namespace CirrusSearch\Query; |
| 4 | |
| 5 | use CirrusSearch\CirrusConfigNames; |
| 6 | use CirrusSearch\CrossSearchStrategy; |
| 7 | use CirrusSearch\Parser\AST\KeywordFeatureNode; |
| 8 | use CirrusSearch\Search\SearchContext; |
| 9 | use CirrusSearch\SearchConfig; |
| 10 | use CirrusSearch\WarningCollector; |
| 11 | use MediaWiki\Title\Title; |
| 12 | |
| 13 | /** |
| 14 | * Finds pages similar to another one. |
| 15 | * Greedy keyword kept for BC purposes, MoreLikeThisFeature should be preferred. |
| 16 | */ |
| 17 | class MoreLikeFeature extends SimpleKeywordFeature implements LegacyKeywordFeature { |
| 18 | use MoreLikeTrait; |
| 19 | |
| 20 | private const MORE_LIKE_THIS = 'morelike'; |
| 21 | |
| 22 | /** |
| 23 | * @var SearchConfig |
| 24 | */ |
| 25 | private $config; |
| 26 | |
| 27 | public function __construct( SearchConfig $config ) { |
| 28 | $this->config = $config; |
| 29 | } |
| 30 | |
| 31 | /** |
| 32 | * @return bool |
| 33 | */ |
| 34 | public function greedy() { |
| 35 | return true; |
| 36 | } |
| 37 | |
| 38 | /** |
| 39 | * morelike is only allowed at the beginning of the query |
| 40 | * @return bool |
| 41 | */ |
| 42 | public function queryHeader() { |
| 43 | return true; |
| 44 | } |
| 45 | |
| 46 | /** @inheritDoc */ |
| 47 | protected function getKeywords() { |
| 48 | return [ self::MORE_LIKE_THIS ]; |
| 49 | } |
| 50 | |
| 51 | /** |
| 52 | * @param string $key |
| 53 | * @param string $valueDelimiter |
| 54 | * @return string |
| 55 | */ |
| 56 | public function getFeatureName( $key, $valueDelimiter ) { |
| 57 | return "more_like"; |
| 58 | } |
| 59 | |
| 60 | /** |
| 61 | * @param KeywordFeatureNode $node |
| 62 | * @return CrossSearchStrategy |
| 63 | */ |
| 64 | public function getCrossSearchStrategy( KeywordFeatureNode $node ) { |
| 65 | // We depend on the db to fetch the title |
| 66 | return CrossSearchStrategy::hostWikiOnlyStrategy(); |
| 67 | } |
| 68 | |
| 69 | /** |
| 70 | * @param SearchContext $context |
| 71 | * @param string $key |
| 72 | * @param string $value |
| 73 | * @param string $quotedValue |
| 74 | * @param bool $negated |
| 75 | * @return array |
| 76 | */ |
| 77 | protected function doApply( SearchContext $context, $key, $value, $quotedValue, $negated ) { |
| 78 | $context->setCacheTtl( $this->config->get( CirrusConfigNames::MoreLikeThisTTL ) ); |
| 79 | $titles = $this->doExpand( $key, $value, $context ); |
| 80 | if ( $titles === [] ) { |
| 81 | $context->setResultsPossible( false ); |
| 82 | return [ null, false ]; |
| 83 | } |
| 84 | $query = $this->buildMoreLikeQuery( $titles ); |
| 85 | |
| 86 | // this erases the main query making it impossible to combine with |
| 87 | // other keywords/search query. MoreLikeThisFeature addresses this problem. |
| 88 | $context->setMainQuery( $query ); |
| 89 | |
| 90 | // highlight snippets are not great so it's worth running a match all query |
| 91 | // to save cpu cycles |
| 92 | $context->setHighlightQuery( new \Elastica\Query\MatchAll() ); |
| 93 | |
| 94 | return [ null, false ]; |
| 95 | } |
| 96 | |
| 97 | /** |
| 98 | * @param KeywordFeatureNode $node |
| 99 | * @param SearchConfig $config |
| 100 | * @param WarningCollector $warningCollector |
| 101 | * @return array|Title[] |
| 102 | */ |
| 103 | public function expand( KeywordFeatureNode $node, SearchConfig $config, WarningCollector $warningCollector ) { |
| 104 | return $this->doExpand( $node->getKey(), $node->getValue(), $warningCollector ); |
| 105 | } |
| 106 | |
| 107 | public function getConfig(): SearchConfig { |
| 108 | return $this->config; |
| 109 | } |
| 110 | } |