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| 1 | <?php |
| 2 | |
| 3 | namespace CirrusSearch\Query; |
| 4 | |
| 5 | use CirrusSearch\Profile\SearchProfileService; |
| 6 | use CirrusSearch\Search\SearchContext; |
| 7 | use Elastica\Query\BoolQuery; |
| 8 | use Elastica\Query\MatchQuery; |
| 9 | use Elastica\Query\MultiMatch; |
| 10 | |
| 11 | /** |
| 12 | * Build a query suited for autocomplete on titles+redirects |
| 13 | */ |
| 14 | class PrefixSearchQueryBuilder { |
| 15 | use QueryBuilderTraits; |
| 16 | |
| 17 | /** |
| 18 | * @param SearchContext $searchContext |
| 19 | * @param string $term the original search term |
| 20 | * @param array|null $variants list of variants |
| 21 | */ |
| 22 | public function build( SearchContext $searchContext, $term, $variants = null ) { |
| 23 | if ( !$this->checkTitleSearchRequestLength( $term, $searchContext ) ) { |
| 24 | return; |
| 25 | } |
| 26 | $searchContext->setOriginalSearchTerm( $term ); |
| 27 | $searchContext->setProfileContext( SearchProfileService::CONTEXT_PREFIXSEARCH ); |
| 28 | $searchContext->addSyntaxUsed( 'prefix' ); |
| 29 | if ( strlen( $term ) > 0 ) { |
| 30 | if ( $searchContext->getConfig()->get( 'CirrusSearchPrefixSearchStartsWithAnyWord' ) ) { |
| 31 | $searchContext->addFilter( $this->wordPrefixQuery( $term, $variants ) ); |
| 32 | } else { |
| 33 | // TODO: weights should be a profile? |
| 34 | $weights = $searchContext->getConfig()->get( 'CirrusSearchPrefixWeights' ); |
| 35 | $searchContext->setMainQuery( $this->keywordPrefixQuery( $term, $variants, $weights ) ); |
| 36 | } |
| 37 | } |
| 38 | } |
| 39 | |
| 40 | private function wordPrefixQuery( $term, $variants ) { |
| 41 | $buildMatch = static function ( $searchTerm ) { |
| 42 | $match = new MatchQuery(); |
| 43 | // TODO: redirect.title? |
| 44 | $match->setField( 'title.word_prefix', [ |
| 45 | 'query' => $searchTerm, |
| 46 | 'analyzer' => 'plain', |
| 47 | 'operator' => 'and', |
| 48 | ] ); |
| 49 | return $match; |
| 50 | }; |
| 51 | $query = new BoolQuery(); |
| 52 | $query->setMinimumShouldMatch( 1 ); |
| 53 | $query->addShould( $buildMatch( $term ) ); |
| 54 | foreach ( $variants as $variant ) { |
| 55 | // This is a filter we don't really care about |
| 56 | // discounting variant matches. |
| 57 | $query->addShould( $buildMatch( $variant ) ); |
| 58 | } |
| 59 | return $query; |
| 60 | } |
| 61 | |
| 62 | private function keywordPrefixQuery( $term, $variants, $weights ) { |
| 63 | // Elasticsearch seems to have trouble extracting the proper terms to highlight |
| 64 | // from the default query we make so we feed it exactly the right query to highlight. |
| 65 | $buildMatch = static function ( $searchTerm, $weight ) use ( $weights ) { |
| 66 | $query = new MultiMatch(); |
| 67 | $query->setQuery( $searchTerm ); |
| 68 | $query->setFields( [ |
| 69 | 'title.prefix^' . ( $weights['title'] * $weight ), |
| 70 | 'redirect.title.prefix^' . ( $weights['redirect'] * $weight ), |
| 71 | 'title.prefix_asciifolding^' . ( $weights['title_asciifolding'] * $weight ), |
| 72 | 'redirect.title.prefix_asciifolding^' . ( $weights['redirect_asciifolding'] * $weight ), |
| 73 | ] ); |
| 74 | return $query; |
| 75 | }; |
| 76 | $query = new BoolQuery(); |
| 77 | $query->setMinimumShouldMatch( 1 ); |
| 78 | $weight = 1; |
| 79 | $query->addShould( $buildMatch( $term, $weight ) ); |
| 80 | if ( $variants ) { |
| 81 | foreach ( $variants as $variant ) { |
| 82 | $weight *= 0.2; |
| 83 | $query->addShould( $buildMatch( $variant, $weight ) ); |
| 84 | } |
| 85 | } |
| 86 | return $query; |
| 87 | } |
| 88 | } |