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| 1 | <?php |
| 2 | namespace Wikibase\Lexeme\Search\Elastic; |
| 3 | |
| 4 | use CirrusSearch\Search\BaseCirrusSearchResultSet; |
| 5 | use CirrusSearch\Search\BaseResultsType; |
| 6 | use Elastica\ResultSet; |
| 7 | use MediaWiki\Language\Language; |
| 8 | use Wikibase\DataModel\Entity\EntityIdParser; |
| 9 | use Wikibase\Lexeme\DataAccess\LexemeDescription; |
| 10 | use Wikibase\Lib\Store\FallbackLabelDescriptionLookupFactory; |
| 11 | use Wikibase\Search\Elastic\EntitySearchUtils; |
| 12 | use Wikibase\Search\Elastic\Fields\StatementCountField; |
| 13 | |
| 14 | /** |
| 15 | * This result type implements the result for searching a Lexeme for fulltext search. |
| 16 | * |
| 17 | * @license GPL-2.0-or-later |
| 18 | * @author Stas Malyshev |
| 19 | */ |
| 20 | class LexemeFulltextResult extends BaseResultsType { |
| 21 | |
| 22 | /** |
| 23 | * @var EntityIdParser |
| 24 | */ |
| 25 | private $idParser; |
| 26 | |
| 27 | /** |
| 28 | * Display language |
| 29 | * @var Language |
| 30 | */ |
| 31 | private $displayLanguage; |
| 32 | /** |
| 33 | * @var FallbackLabelDescriptionLookupFactory |
| 34 | */ |
| 35 | private $termLookupFactory; |
| 36 | |
| 37 | /** |
| 38 | * @param EntityIdParser $idParser |
| 39 | * @param Language $displayLanguage User display language |
| 40 | * @param FallbackLabelDescriptionLookupFactory $termLookupFactory |
| 41 | * Lookup factory for assembling descriptions |
| 42 | */ |
| 43 | public function __construct( |
| 44 | EntityIdParser $idParser, |
| 45 | Language $displayLanguage, |
| 46 | FallbackLabelDescriptionLookupFactory $termLookupFactory |
| 47 | ) { |
| 48 | $this->idParser = $idParser; |
| 49 | $this->termLookupFactory = $termLookupFactory; |
| 50 | $this->displayLanguage = $displayLanguage; |
| 51 | } |
| 52 | |
| 53 | /** |
| 54 | * Get the source filtering to be used loading the result. |
| 55 | * |
| 56 | * @return string[] |
| 57 | */ |
| 58 | public function getSourceFiltering() { |
| 59 | return array_merge( parent::getSourceFiltering(), [ |
| 60 | LemmaField::NAME, |
| 61 | LexemeLanguageField::NAME, |
| 62 | LexemeCategoryField::NAME, |
| 63 | FormsField::NAME, |
| 64 | StatementCountField::NAME, |
| 65 | // The web ui for fulltext search expects this to be returned. |
| 66 | // Longer term there should probably be some concept where the UI |
| 67 | // requests additional properties instead of baking it in at these |
| 68 | // lower levels for each fulltext results type. |
| 69 | 'timestamp', |
| 70 | ] ); |
| 71 | } |
| 72 | |
| 73 | /** |
| 74 | * Get the fields to load. Most of the time we'll use source filtering instead but |
| 75 | * some fields aren't part of the source. |
| 76 | * |
| 77 | * @return string[] |
| 78 | */ |
| 79 | public function getFields() { |
| 80 | return []; |
| 81 | } |
| 82 | |
| 83 | /** |
| 84 | * Get the highlighting configuration. |
| 85 | * |
| 86 | * @param array $highlightSource configuration for how to highlight the source. |
| 87 | * Empty if source should be ignored. |
| 88 | * @return array|null highlighting configuration for elasticsearch |
| 89 | */ |
| 90 | public function getHighlightingConfiguration( array $highlightSource ) { |
| 91 | $config = [ |
| 92 | 'pre_tags' => [ '' ], |
| 93 | 'post_tags' => [ '' ], |
| 94 | 'fields' => [], |
| 95 | ]; |
| 96 | $config['fields']['title'] = [ |
| 97 | 'type' => 'experimental', |
| 98 | 'fragmenter' => "none", |
| 99 | 'number_of_fragments' => 0, |
| 100 | 'matched_fields' => [ 'title.keyword' ] |
| 101 | ]; |
| 102 | $config['fields']['lexeme_forms.id'] = [ |
| 103 | 'type' => 'experimental', |
| 104 | 'fragmenter' => "none", |
| 105 | 'number_of_fragments' => 0, |
| 106 | 'options' => [ |
| 107 | 'skip_if_last_matched' => true, |
| 108 | ], |
| 109 | ]; |
| 110 | $config['fields']["lemma"] = [ |
| 111 | 'type' => 'experimental', |
| 112 | 'fragmenter' => "none", |
| 113 | 'number_of_fragments' => 0, |
| 114 | 'options' => [ |
| 115 | 'skip_if_last_matched' => true, |
| 116 | ], |
| 117 | ]; |
| 118 | $config['fields']["lexeme_forms.representation"] = [ |
| 119 | 'type' => 'experimental', |
| 120 | 'fragmenter' => "none", |
| 121 | 'number_of_fragments' => 30, |
| 122 | 'fragment_size' => 1000, // Hopefully this is enough |
| 123 | 'options' => [ |
| 124 | 'skip_if_last_matched' => true, |
| 125 | ], |
| 126 | ]; |
| 127 | |
| 128 | return $config; |
| 129 | } |
| 130 | |
| 131 | /** |
| 132 | * Produce raw result for Form ID match. |
| 133 | * @param string[][] $highlight Highlighter data |
| 134 | * @param array $sourceData Lexeme source data |
| 135 | * @return array|null Null if match is bad |
| 136 | */ |
| 137 | private function getFormIdResult( $highlight, $sourceData ) { |
| 138 | $formId = $highlight['lexeme_forms.id'][0]; |
| 139 | $formIdParsed = EntitySearchUtils::parseOrNull( $formId, $this->idParser ); |
| 140 | if ( !$formIdParsed ) { |
| 141 | // Got some bad id?? Weird. |
| 142 | return null; |
| 143 | } |
| 144 | $repr = ''; |
| 145 | $features = []; |
| 146 | foreach ( $sourceData['lexeme_forms'] as $form ) { |
| 147 | if ( $form['id'] === $formId ) { |
| 148 | // TODO: how we choose one? |
| 149 | $repr = $form['representation'][0]; |
| 150 | // Convert features to EntityId's |
| 151 | $features = array_filter( array_map( function ( $featureId ) { |
| 152 | return EntitySearchUtils::parseOrNull( $featureId, $this->idParser ); |
| 153 | }, $form['features'] ) ); |
| 154 | break; |
| 155 | } |
| 156 | } |
| 157 | if ( $repr === '' ) { |
| 158 | // Didn't find the right id? Weird, skip it. |
| 159 | return null; |
| 160 | } |
| 161 | |
| 162 | return [ |
| 163 | 'formId' => $formId, |
| 164 | 'representation' => $repr, |
| 165 | 'features' => $features, |
| 166 | ]; |
| 167 | } |
| 168 | |
| 169 | /** |
| 170 | * Get data for specific form match from source data |
| 171 | * @param array[] $sourceForms 'forms' field of the source data |
| 172 | * @param string[] $highlight Highlighter data about match |
| 173 | * @return array|null Null if match is bad |
| 174 | */ |
| 175 | private function getFormRepresentationResult( $sourceForms, $highlight ) { |
| 176 | foreach ( $sourceForms as $form ) { |
| 177 | $reprMatches = array_intersect( $form['representation'], |
| 178 | $highlight ); |
| 179 | if ( !$reprMatches ) { |
| 180 | continue; |
| 181 | } |
| 182 | // matches the data |
| 183 | $formIdParsed = EntitySearchUtils::parseOrNull( $form['id'], $this->idParser ); |
| 184 | if ( !$formIdParsed ) { |
| 185 | // Got some bad id?? Weird. |
| 186 | continue; |
| 187 | } |
| 188 | // Convert features to EntityId's |
| 189 | $featureIds = array_filter( array_map( function ( $featureId ) { |
| 190 | return EntitySearchUtils::parseOrNull( $featureId, $this->idParser ); |
| 191 | }, $form['features'] ) ); |
| 192 | |
| 193 | return [ |
| 194 | 'formId' => $formIdParsed, |
| 195 | 'representation' => reset( $reprMatches ), |
| 196 | 'features' => $featureIds, |
| 197 | ]; |
| 198 | } |
| 199 | // Didn't find anything |
| 200 | return null; |
| 201 | } |
| 202 | |
| 203 | /** |
| 204 | * Convert search result from ElasticSearch result set to LexemeResultSet. |
| 205 | * |
| 206 | * The data inside the set are not rendered yet, but the set is configured with |
| 207 | * the label lookup that has necessary item labels already loaded. |
| 208 | * |
| 209 | * @param ResultSet $result ElasticSearch results |
| 210 | * @return \ISearchResultSet |
| 211 | */ |
| 212 | public function transformElasticsearchResult( ResultSet $result ) { |
| 213 | $rawResults = $entityIds = []; |
| 214 | foreach ( $result->getResults() as $r ) { |
| 215 | $rawResultKey = spl_object_hash( $r ); |
| 216 | $sourceData = $r->getSource(); |
| 217 | $entityId = EntitySearchUtils::parseOrNull( $sourceData['title'], $this->idParser ); |
| 218 | if ( !$entityId ) { |
| 219 | // Can not parse entity ID - skip it |
| 220 | // TODO: what we do here if no language code? |
| 221 | // Not sure we want to index all lemma languages. |
| 222 | // Should we just fake the term language code? |
| 223 | continue; |
| 224 | } |
| 225 | |
| 226 | $lemmaCode = LexemeTermResult::extractLanguageCode( $sourceData ); |
| 227 | |
| 228 | // Highlight part contains information about what has actually been matched. |
| 229 | $highlight = $r->getHighlights(); |
| 230 | |
| 231 | // we accept missing lemma fields (see T365692) |
| 232 | $lang = $sourceData['lexeme_language']['entity'] ?? ''; |
| 233 | $category = $sourceData['lexical_category'] ?? ''; |
| 234 | |
| 235 | $features = []; |
| 236 | $lexemeData = [ |
| 237 | 'lexemeId' => $entityId, |
| 238 | // Having empty lemma is unusual, but in theory possible |
| 239 | 'lemma' => empty( $sourceData['lemma'] ) ? '' : $sourceData['lemma'][0], |
| 240 | 'lang' => $lang, |
| 241 | 'langcode' => $lemmaCode, |
| 242 | 'category' => $category, |
| 243 | 'elasticResult' => $r |
| 244 | ]; |
| 245 | |
| 246 | if ( !empty( $highlight['lexeme_forms.id'] ) ) { |
| 247 | // If we matched Form ID, this means it's a match by ID |
| 248 | |
| 249 | $idResult = $this->getFormIdResult( $highlight, $sourceData ); |
| 250 | if ( !$idResult ) { |
| 251 | continue; |
| 252 | } |
| 253 | |
| 254 | $lexemeData = $idResult + $lexemeData; |
| 255 | $features = array_merge( $features, $idResult['features'] ); |
| 256 | } elseif ( !empty( $highlight['lemma'] ) ) { |
| 257 | // TODO: make result display highlight this |
| 258 | $lexemeData['matchedLemma'] = $highlight['lemma'][0]; |
| 259 | } elseif ( !empty( $highlight["lexeme_forms.representation"] ) ) { |
| 260 | // For now, find the first form that matches |
| 261 | $formResult = $this->getFormRepresentationResult( $sourceData['lexeme_forms'], |
| 262 | $highlight['lexeme_forms.representation'] ); |
| 263 | if ( $formResult ) { |
| 264 | $lexemeData = $formResult + $lexemeData; |
| 265 | $features = array_merge( $features, $formResult['features'] ); |
| 266 | } |
| 267 | } |
| 268 | |
| 269 | // Doing two-stage resolution here since we want to prefetch all labels for |
| 270 | // auxiliary entities before using them to construct descriptions. |
| 271 | $lexemeData['elastica_result_hash'] = $rawResultKey; |
| 272 | $rawResults[$entityId->getSerialization()] = $lexemeData; |
| 273 | $entityIds[$lang] = EntitySearchUtils::parseOrNull( $lang, $this->idParser ); |
| 274 | $entityIds[$category] = EntitySearchUtils::parseOrNull( $category, $this->idParser ); |
| 275 | foreach ( $features as $feature ) { |
| 276 | $entityIds[$feature->getSerialization()] = $feature; |
| 277 | } |
| 278 | } |
| 279 | |
| 280 | if ( !$rawResults ) { |
| 281 | return new \CirrusSearch\Search\ResultSet(); |
| 282 | } |
| 283 | // Create prefetched lookup |
| 284 | $termLookup = $this->termLookupFactory->newLabelDescriptionLookup( $this->displayLanguage, |
| 285 | array_filter( $entityIds ) ); |
| 286 | $descriptionMaker = new LexemeDescription( $termLookup, $this->idParser, |
| 287 | $this->displayLanguage ); |
| 288 | |
| 289 | return new LexemeResultSet( $result, $this->displayLanguage, $descriptionMaker, $rawResults ); |
| 290 | } |
| 291 | |
| 292 | /** |
| 293 | * @return mixed Empty set of search results |
| 294 | */ |
| 295 | public function createEmptyResult() { |
| 296 | return BaseCirrusSearchResultSet::emptyResultSet( false ); |
| 297 | } |
| 298 | |
| 299 | } |