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| 1 | <?php |
| 2 | |
| 3 | namespace MediaWiki\Extension\Math; |
| 4 | |
| 5 | use DataValues\StringValue; |
| 6 | use InvalidArgumentException; |
| 7 | use MediaWiki\Config\ConfigException; |
| 8 | use MediaWiki\Config\ServiceOptions; |
| 9 | use MediaWiki\Languages\LanguageFactory; |
| 10 | use MediaWiki\Languages\LanguageNameUtils; |
| 11 | use MediaWiki\Site\Site; |
| 12 | use Psr\Log\LoggerInterface; |
| 13 | use Wikibase\Client\RepoLinker; |
| 14 | use Wikibase\DataModel\Entity\EntityId; |
| 15 | use Wikibase\DataModel\Entity\EntityIdParser; |
| 16 | use Wikibase\DataModel\Entity\EntityIdParsingException; |
| 17 | use Wikibase\DataModel\Entity\EntityIdValue; |
| 18 | use Wikibase\DataModel\Entity\Item; |
| 19 | use Wikibase\DataModel\Entity\ItemId; |
| 20 | use Wikibase\DataModel\Entity\PropertyId; |
| 21 | use Wikibase\DataModel\Services\Lookup\LabelDescriptionLookup; |
| 22 | use Wikibase\DataModel\Snak\PropertyValueSnak; |
| 23 | use Wikibase\DataModel\Snak\Snak; |
| 24 | use Wikibase\DataModel\Statement\StatementList; |
| 25 | use Wikibase\Lib\Store\EntityRevisionLookup; |
| 26 | use Wikibase\Lib\Store\FallbackLabelDescriptionLookupFactory; |
| 27 | use Wikibase\Lib\Store\RevisionedUnresolvedRedirectException; |
| 28 | use Wikibase\Lib\Store\StorageException; |
| 29 | |
| 30 | /** |
| 31 | * A class that connects with the local instance of wikibase to fetch |
| 32 | * information from single items. There is always only one instance of this class. |
| 33 | * |
| 34 | * @see MathWikibaseConnector::getInstance() to get an instance of the class |
| 35 | */ |
| 36 | class MathWikibaseConnector { |
| 37 | /** @var string[] */ |
| 38 | public const CONSTRUCTOR_OPTIONS = [ |
| 39 | 'MathWikibasePropertyIdHasPart', |
| 40 | 'MathWikibasePropertyIdDefiningFormula', |
| 41 | 'MathWikibasePropertyIdInDefiningFormula', |
| 42 | 'MathWikibasePropertyIdQuantitySymbol', |
| 43 | 'MathWikibasePropertyIdSymbolRepresents' |
| 44 | ]; |
| 45 | |
| 46 | /** @var LoggerInterface */ |
| 47 | private $logger; |
| 48 | |
| 49 | /** @var RepoLinker */ |
| 50 | private $repoLinker; |
| 51 | |
| 52 | /** @var LanguageFactory */ |
| 53 | private $languageFactory; |
| 54 | |
| 55 | /** @var LanguageNameUtils */ |
| 56 | private $languageNameUtils; |
| 57 | |
| 58 | /** @var EntityRevisionLookup */ |
| 59 | private $entityRevisionLookup; |
| 60 | |
| 61 | /** @var Site */ |
| 62 | private $site; |
| 63 | |
| 64 | /** @var FallbackLabelDescriptionLookupFactory */ |
| 65 | private $labelDescriptionLookupFactory; |
| 66 | |
| 67 | /** @var MathFormatter */ |
| 68 | private $mathFormatter; |
| 69 | |
| 70 | /** @var EntityIdParser */ |
| 71 | private $idParser; |
| 72 | |
| 73 | /** @var PropertyId|null */ |
| 74 | private $propertyIdHasPart; |
| 75 | |
| 76 | /** @var PropertyId|null */ |
| 77 | private $propertyIdDefiningFormula; |
| 78 | |
| 79 | /** @var PropertyId|null */ |
| 80 | private $propertyIdInDefiningFormula; |
| 81 | |
| 82 | /** @var PropertyId|null */ |
| 83 | private $propertyIdQuantitySymbol; |
| 84 | |
| 85 | /** @var PropertyId|null */ |
| 86 | private $propertyIdSymbolRepresents; |
| 87 | |
| 88 | /** |
| 89 | * @param ServiceOptions $options |
| 90 | * @param RepoLinker $repoLinker |
| 91 | * @param LanguageFactory $languageFactory |
| 92 | * @param LanguageNameUtils $languageNameUtils |
| 93 | * @param EntityRevisionLookup $entityRevisionLookup |
| 94 | * @param FallbackLabelDescriptionLookupFactory $labelDescriptionLookupFactory |
| 95 | * @param Site $site |
| 96 | * @param EntityIdParser $entityIdParser |
| 97 | * @param MathFormatter $mathFormatter |
| 98 | * @param LoggerInterface $logger |
| 99 | */ |
| 100 | public function __construct( |
| 101 | ServiceOptions $options, |
| 102 | RepoLinker $repoLinker, |
| 103 | LanguageFactory $languageFactory, |
| 104 | LanguageNameUtils $languageNameUtils, |
| 105 | EntityRevisionLookup $entityRevisionLookup, |
| 106 | FallbackLabelDescriptionLookupFactory $labelDescriptionLookupFactory, |
| 107 | Site $site, |
| 108 | EntityIdParser $entityIdParser, |
| 109 | MathFormatter $mathFormatter, |
| 110 | LoggerInterface $logger |
| 111 | ) { |
| 112 | $options->assertRequiredOptions( self::CONSTRUCTOR_OPTIONS ); |
| 113 | $this->repoLinker = $repoLinker; |
| 114 | $this->languageFactory = $languageFactory; |
| 115 | $this->languageNameUtils = $languageNameUtils; |
| 116 | $this->entityRevisionLookup = $entityRevisionLookup; |
| 117 | $this->labelDescriptionLookupFactory = $labelDescriptionLookupFactory; |
| 118 | $this->site = $site; |
| 119 | $this->idParser = $entityIdParser; |
| 120 | $this->mathFormatter = $mathFormatter; |
| 121 | $this->logger = $logger; |
| 122 | |
| 123 | $this->propertyIdHasPart = $this->loadPropertyId( |
| 124 | $options->get( "MathWikibasePropertyIdHasPart" ) |
| 125 | ); |
| 126 | $this->propertyIdDefiningFormula = $this->loadPropertyId( |
| 127 | $options->get( "MathWikibasePropertyIdDefiningFormula" ) |
| 128 | ); |
| 129 | $this->propertyIdInDefiningFormula = $this->loadPropertyId( |
| 130 | $options->get( "MathWikibasePropertyIdInDefiningFormula" ) |
| 131 | ); |
| 132 | $this->propertyIdQuantitySymbol = $this->loadPropertyId( |
| 133 | $options->get( "MathWikibasePropertyIdQuantitySymbol" ) |
| 134 | ); |
| 135 | $this->propertyIdSymbolRepresents = $this->loadPropertyId( |
| 136 | $options->get( "MathWikibasePropertyIdSymbolRepresents" ) |
| 137 | ); |
| 138 | } |
| 139 | |
| 140 | /** |
| 141 | * Returns the given PropertyId if available. |
| 142 | * @param string $propertyId the string of the Wikibase property |
| 143 | * @return EntityId|null the property object or null if unavailable |
| 144 | */ |
| 145 | private function loadPropertyId( string $propertyId ): ?EntityId { |
| 146 | try { |
| 147 | return $this->idParser->parse( $propertyId ); |
| 148 | } catch ( ConfigException $e ) { |
| 149 | return null; |
| 150 | } |
| 151 | } |
| 152 | |
| 153 | /** |
| 154 | * Returns the inner statements from given statements for a given property ID or an empty list if the given ID |
| 155 | * not exists. |
| 156 | * @param StatementList $statements |
| 157 | * @param PropertyId|null $id |
| 158 | * @return StatementList might be empty |
| 159 | */ |
| 160 | private function getStatements( StatementList $statements, ?PropertyId $id ): StatementList { |
| 161 | if ( $id === null ) { |
| 162 | return new StatementList(); |
| 163 | } |
| 164 | return $statements->getByPropertyId( $id ); |
| 165 | } |
| 166 | |
| 167 | /** |
| 168 | * @param string $qid |
| 169 | * @param string $langCode the language to fetch data |
| 170 | * (may fallback if requested language does not exist) |
| 171 | * |
| 172 | * @return MathWikibaseInfo the object may be empty if no information can be fetched. |
| 173 | * @throws InvalidArgumentException if the language code does not exist or the given |
| 174 | * id does not exist |
| 175 | */ |
| 176 | public function fetchWikibaseFromId( string $qid, string $langCode ): MathWikibaseInfo { |
| 177 | if ( $this->languageNameUtils->isValidCode( $langCode ) ) { |
| 178 | $lang = $this->languageFactory->getLanguage( $langCode ); |
| 179 | } else { |
| 180 | throw new InvalidArgumentException( "Invalid language code specified." ); |
| 181 | } |
| 182 | |
| 183 | $langLookup = $this->labelDescriptionLookupFactory->newLabelDescriptionLookup( $lang ); |
| 184 | try { |
| 185 | $entityId = $this->idParser->parse( $qid ); // exception if the given ID is invalid |
| 186 | $entityRevision = $this->entityRevisionLookup->getEntityRevision( $entityId ); |
| 187 | } catch ( EntityIdParsingException $e ) { |
| 188 | throw new InvalidArgumentException( "Invalid Wikibase ID." ); |
| 189 | } catch ( RevisionedUnresolvedRedirectException | StorageException $e ) { |
| 190 | throw new InvalidArgumentException( "Non-existing Wikibase ID." ); |
| 191 | } |
| 192 | |
| 193 | if ( !$entityId || !$entityRevision ) { |
| 194 | throw new InvalidArgumentException( "Non-existing Wikibase ID." ); |
| 195 | } |
| 196 | |
| 197 | $entity = $entityRevision->getEntity(); |
| 198 | $output = new MathWikibaseInfo( $entityId, $this->mathFormatter ); |
| 199 | |
| 200 | if ( $entity instanceof Item ) { |
| 201 | $this->fetchLabelDescription( $output, $langLookup ); |
| 202 | $this->fetchStatements( $output, $entity, $langLookup ); |
| 203 | return $output; |
| 204 | } else { // we only allow Wikibase items |
| 205 | throw new InvalidArgumentException( "The specified Wikibase ID does not represented an item." ); |
| 206 | } |
| 207 | } |
| 208 | |
| 209 | /** |
| 210 | * Fetches only label and description from an entity. |
| 211 | * @param MathWikibaseInfo $output the entity id of the entity |
| 212 | * @param LabelDescriptionLookup $langLookup a lookup handler to fetch right languages |
| 213 | * @return MathWikibaseInfo filled up with label and description |
| 214 | */ |
| 215 | private function fetchLabelDescription( |
| 216 | MathWikibaseInfo $output, |
| 217 | LabelDescriptionLookup $langLookup ) { |
| 218 | $label = $langLookup->getLabel( $output->getId() ); |
| 219 | $desc = $langLookup->getDescription( $output->getId() ); |
| 220 | |
| 221 | if ( $label ) { |
| 222 | $output->setLabel( $label->getText() ); |
| 223 | } |
| 224 | |
| 225 | if ( $desc ) { |
| 226 | $output->setDescription( $desc->getText() ); |
| 227 | } |
| 228 | |
| 229 | return $output; |
| 230 | } |
| 231 | |
| 232 | /** |
| 233 | * Fetches 'has part' statements from a given item element with a defined lookup object for |
| 234 | * the languages. |
| 235 | * @param MathWikibaseInfo $output the output element |
| 236 | * @param Item $item item to fetch statements from |
| 237 | * @param LabelDescriptionLookup $langLookup |
| 238 | * @return MathWikibaseInfo the updated $output object |
| 239 | */ |
| 240 | private function fetchStatements( |
| 241 | MathWikibaseInfo $output, |
| 242 | Item $item, |
| 243 | LabelDescriptionLookup $langLookup ) { |
| 244 | $statements = $item->getStatements(); |
| 245 | $formulaComponentStatements = $this->getStatements( $statements, $this->propertyIdHasPart ); |
| 246 | if ( $formulaComponentStatements->isEmpty() ) { |
| 247 | $formulaComponentStatements = $this->getStatements( $statements, $this->propertyIdInDefiningFormula ); |
| 248 | } |
| 249 | $this->fetchHasPartSnaks( $output, $formulaComponentStatements, $langLookup ); |
| 250 | |
| 251 | $symbolStatement = $this->getStatements( $statements, $this->propertyIdDefiningFormula ); |
| 252 | if ( $symbolStatement->count() < 1 ) { // if it's not a formula, it might be a symbol |
| 253 | $symbolStatement = $this->getStatements( $statements, $this->propertyIdQuantitySymbol ); |
| 254 | } |
| 255 | $this->fetchSymbol( $output, $symbolStatement ); |
| 256 | return $output; |
| 257 | } |
| 258 | |
| 259 | /** |
| 260 | * Fetches the symbol or defining formula from a statement list and adds the symbol to the |
| 261 | * given info object |
| 262 | * @param MathWikibaseInfo $output |
| 263 | * @param StatementList $statements |
| 264 | * @return MathWikibaseInfo updated object |
| 265 | */ |
| 266 | private function fetchSymbol( MathWikibaseInfo $output, StatementList $statements ) { |
| 267 | foreach ( $statements as $statement ) { |
| 268 | $snak = $statement->getMainSnak(); |
| 269 | if ( $snak instanceof PropertyValueSnak && $this->isSymbolSnak( $snak ) ) { |
| 270 | $dataVal = $snak->getDataValue(); |
| 271 | $symbol = new StringValue( $dataVal->getValue() ); |
| 272 | $output->setSymbol( $symbol ); |
| 273 | return $output; |
| 274 | } |
| 275 | } |
| 276 | |
| 277 | return $output; |
| 278 | } |
| 279 | |
| 280 | /** |
| 281 | * Fetches single snaks from 'has part' statements |
| 282 | * |
| 283 | * @param MathWikibaseInfo $output |
| 284 | * @param StatementList $statements the 'has part' statements |
| 285 | * @param LabelDescriptionLookup $langLookup |
| 286 | * @return MathWikibaseInfo |
| 287 | * @todo refactor this method once Wikibase has a more convenient way to handle snaks |
| 288 | */ |
| 289 | private function fetchHasPartSnaks( |
| 290 | MathWikibaseInfo $output, |
| 291 | StatementList $statements, |
| 292 | LabelDescriptionLookup $langLookup ) { |
| 293 | foreach ( $statements as $statement ) { |
| 294 | $snaks = $statement->getAllSnaks(); |
| 295 | $innerInfo = null; |
| 296 | $symbol = null; |
| 297 | |
| 298 | foreach ( $snaks as $snak ) { |
| 299 | if ( $snak instanceof PropertyValueSnak ) { |
| 300 | if ( $this->isSymbolSnak( $snak ) ) { |
| 301 | $dataVal = $snak->getDataValue(); |
| 302 | $symbol = new StringValue( $dataVal->getValue() ); |
| 303 | } elseif ( $this->isFormulaItemSnak( $snak ) ) { |
| 304 | $dataVal = $snak->getDataValue(); |
| 305 | $entityIdValue = $dataVal->getValue(); |
| 306 | if ( $entityIdValue instanceof EntityIdValue ) { |
| 307 | $innerEntityId = $entityIdValue->getEntityId(); |
| 308 | $innerInfo = new MathWikibaseInfo( $innerEntityId, $output->getFormatter() ); |
| 309 | $this->fetchLabelDescription( $innerInfo, $langLookup ); |
| 310 | $url = $this->fetchPageUrl( $innerEntityId ); |
| 311 | if ( $url ) { |
| 312 | $innerInfo->setUrl( $url ); |
| 313 | } |
| 314 | } |
| 315 | } |
| 316 | } |
| 317 | } |
| 318 | |
| 319 | if ( $innerInfo && $symbol ) { |
| 320 | $innerInfo->setSymbol( $symbol ); |
| 321 | $output->addHasPartElement( $innerInfo ); |
| 322 | } |
| 323 | } |
| 324 | |
| 325 | return $output; |
| 326 | } |
| 327 | |
| 328 | /** |
| 329 | * Fetch the page url for a given entity id. |
| 330 | * @param EntityId $entityId |
| 331 | * @return string|false |
| 332 | */ |
| 333 | private function fetchPageUrl( EntityId $entityId ) { |
| 334 | try { |
| 335 | $entityRevision = $this->entityRevisionLookup->getEntityRevision( $entityId ); |
| 336 | $innerEntity = $entityRevision->getEntity(); |
| 337 | if ( $innerEntity instanceof Item ) { |
| 338 | $globalID = $this->site->getGlobalId(); |
| 339 | if ( $innerEntity->hasLinkToSite( $globalID ) ) { |
| 340 | $siteLink = $innerEntity->getSiteLink( $globalID ); |
| 341 | return $this->site->getPageUrl( $siteLink->getPageName() ); |
| 342 | } |
| 343 | } |
| 344 | } catch ( StorageException $e ) { |
| 345 | $this->logger->warning( |
| 346 | "Cannot fetch URL for EntityId " . $entityId . ". Reason: " . $e->getMessage() |
| 347 | ); |
| 348 | } |
| 349 | return false; |
| 350 | } |
| 351 | |
| 352 | /** |
| 353 | * @param Snak $snak |
| 354 | * @return bool true if the given snak is either a defining formula, a quantity symbol, or a 'in defining formula' |
| 355 | */ |
| 356 | private function isSymbolSnak( Snak $snak ) { |
| 357 | return $snak->getPropertyId()->equals( $this->propertyIdQuantitySymbol ) || |
| 358 | $snak->getPropertyId()->equals( $this->propertyIdDefiningFormula ) || |
| 359 | $snak->getPropertyId()->equals( $this->propertyIdInDefiningFormula ); |
| 360 | } |
| 361 | |
| 362 | /** |
| 363 | * @param Snak $snak |
| 364 | * @return bool true if the given snak is either the 'has part or parts' or the 'symbol represents' property |
| 365 | */ |
| 366 | private function isFormulaItemSnak( Snak $snak ) { |
| 367 | return $snak->getPropertyId()->equals( $this->propertyIdHasPart ) || |
| 368 | $snak->getPropertyId()->equals( $this->propertyIdSymbolRepresents ); |
| 369 | } |
| 370 | |
| 371 | /** |
| 372 | * @param string $qID |
| 373 | * @return string |
| 374 | */ |
| 375 | public function buildURL( string $qID ): string { |
| 376 | return $this->repoLinker->getEntityUrl( new ItemId( $qID ) ); |
| 377 | } |
| 378 | } |