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| 1 | <?php |
| 2 | |
| 3 | namespace Wikibase\Search\Elastic\Query; |
| 4 | |
| 5 | use CirrusSearch\Parser\AST\KeywordFeatureNode; |
| 6 | use CirrusSearch\Query\Builder\QueryBuildingContext; |
| 7 | use CirrusSearch\Query\FilterQueryFeature; |
| 8 | use CirrusSearch\Query\SimpleKeywordFeature; |
| 9 | use CirrusSearch\Search\SearchContext; |
| 10 | use CirrusSearch\WarningCollector; |
| 11 | use Elastica\Query\BoolQuery; |
| 12 | use Elastica\Query\Exists; |
| 13 | |
| 14 | /** |
| 15 | * Abstract class supporting querying for the existence or nonexistence of term values by language. |
| 16 | * Currently supports descriptions (via 'hasdescription:' or 'hascaption:') and labels (via |
| 17 | * 'haslabel:'). |
| 18 | * @see https://phabricator.wikimedia.org/T220282 |
| 19 | */ |
| 20 | class HasDataForLangFeature extends SimpleKeywordFeature implements FilterQueryFeature { |
| 21 | |
| 22 | /** @var int A limit to the number of fields that can be queried at once */ |
| 23 | private const MAX_FIELDS = 30; |
| 24 | |
| 25 | /** @var true[] Keyed by known language codes for set membership check */ |
| 26 | private $validLangs; |
| 27 | |
| 28 | /** |
| 29 | * @return string[] |
| 30 | */ |
| 31 | protected function getKeywords() { |
| 32 | return [ 'hasdescription', 'haslabel', 'hascaption' ]; |
| 33 | } |
| 34 | |
| 35 | /** |
| 36 | * HasTermDataFeature constructor. |
| 37 | * @param string[] $languages list of languages indexed in elastic. Must all be lowercase. |
| 38 | */ |
| 39 | public function __construct( $languages ) { |
| 40 | $this->validLangs = []; |
| 41 | foreach ( $languages as $lang ) { |
| 42 | $this->validLangs[$lang] = true; |
| 43 | } |
| 44 | } |
| 45 | |
| 46 | /** |
| 47 | * @param SearchContext $context |
| 48 | * @param string $key The keyword |
| 49 | * @param string $value The value attached to the keyword with quotes stripped |
| 50 | * @param string $quotedValue The original value in the search string, including quotes if used |
| 51 | * @param bool $negated Is the search negated? Not used to generate the returned AbstractQuery, |
| 52 | * that will be negated as necessary. Used for any other building/context necessary. |
| 53 | * @return array Two element array, first an AbstractQuery or null to apply to the |
| 54 | * query. Second a boolean indicating if the quotedValue should be kept in the search |
| 55 | * string. |
| 56 | */ |
| 57 | protected function doApply( SearchContext $context, $key, $value, $quotedValue, $negated ) { |
| 58 | $langCodes = $this->parseValue( |
| 59 | $key, |
| 60 | $value, |
| 61 | $quotedValue, |
| 62 | '', |
| 63 | '', |
| 64 | $context |
| 65 | ); |
| 66 | if ( $langCodes === [] ) { |
| 67 | $context->setResultsPossible( false ); |
| 68 | return [ null, false ]; |
| 69 | } |
| 70 | return [ $this->makeQuery( $key, $langCodes ), false ]; |
| 71 | } |
| 72 | |
| 73 | /** |
| 74 | * Builds a boolean query requiring the existence of a value in each query language for the |
| 75 | * specified field. |
| 76 | * |
| 77 | * @param string $key the search keywords |
| 78 | * @param array $langCodes valid language codes parsed from the query term |
| 79 | * @return BoolQuery |
| 80 | */ |
| 81 | private function makeQuery( $key, array $langCodes ) { |
| 82 | $query = new BoolQuery(); |
| 83 | if ( $langCodes === [ '__all__' ] ) { |
| 84 | if ( $key === 'haslabel' ) { |
| 85 | $field = 'labels_all.plain'; |
| 86 | } else { |
| 87 | $field = $this->getFieldName( $key ) . '.*.plain'; |
| 88 | } |
| 89 | $query->addShould( new Exists( $field ) ); |
| 90 | return $query; |
| 91 | } |
| 92 | foreach ( $langCodes as $lang ) { |
| 93 | $query->addShould( new Exists( $this->getFieldName( $key ) . '.' . $lang . '.plain' ) ); |
| 94 | } |
| 95 | return $query; |
| 96 | } |
| 97 | |
| 98 | /** |
| 99 | * @param string $key |
| 100 | * @param string $value |
| 101 | * @param string $quotedValue |
| 102 | * @param string $valueDelimiter |
| 103 | * @param string $suffix |
| 104 | * @param WarningCollector $warningCollector |
| 105 | * @return string[] deduplicated list of fields to query for the existence of values |
| 106 | */ |
| 107 | public function parseValue( |
| 108 | $key, |
| 109 | $value, |
| 110 | $quotedValue, |
| 111 | $valueDelimiter, |
| 112 | $suffix, |
| 113 | WarningCollector $warningCollector |
| 114 | ) { |
| 115 | if ( $value === '*' ) { |
| 116 | return [ '__all__' ]; |
| 117 | } |
| 118 | $langCodes = []; |
| 119 | |
| 120 | $langCodeCandidates = array_unique( array_map( 'mb_strtolower', explode( ',', $value ) ) ); |
| 121 | |
| 122 | foreach ( $langCodeCandidates as $candidate ) { |
| 123 | if ( isset( $this->validLangs[$candidate] ) ) { |
| 124 | $langCodes[] = $candidate; |
| 125 | } else { |
| 126 | $warningCollector->addWarning( |
| 127 | 'wikibasecirrus-keywordfeature-unknown-language-code', |
| 128 | $key, |
| 129 | $candidate |
| 130 | ); |
| 131 | } |
| 132 | } |
| 133 | |
| 134 | if ( count( $langCodes ) > self::MAX_FIELDS ) { |
| 135 | $warningCollector->addWarning( 'wikibasecirrus-keywordfeature-too-many-language-codes', |
| 136 | $key, self::MAX_FIELDS, count( $langCodes ) ); |
| 137 | $langCodes = array_slice( $langCodes, 0, self::MAX_FIELDS ); |
| 138 | } |
| 139 | |
| 140 | return $langCodes; |
| 141 | } |
| 142 | |
| 143 | /** |
| 144 | * @param KeywordFeatureNode $node |
| 145 | * @param QueryBuildingContext $context |
| 146 | * @return BoolQuery|null |
| 147 | */ |
| 148 | public function getFilterQuery( KeywordFeatureNode $node, QueryBuildingContext $context ) { |
| 149 | $langCodes = $node->getParsedValue(); |
| 150 | if ( $langCodes === [] ) { |
| 151 | return null; |
| 152 | } |
| 153 | return $this->makeQuery( $node->getKey(), $langCodes ); |
| 154 | } |
| 155 | |
| 156 | /** |
| 157 | * @param string $key the search keyword |
| 158 | * @return string field name to search |
| 159 | */ |
| 160 | private function getFieldName( $key ) { |
| 161 | return $key === 'haslabel' ? 'labels' : 'descriptions'; |
| 162 | } |
| 163 | |
| 164 | } |