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| 1 | <?php |
| 2 | |
| 3 | namespace GrowthExperiments\NewcomerTasks\Topic; |
| 4 | |
| 5 | use MediaWiki\Json\JsonUnserializer; |
| 6 | use MediaWiki\Language\RawMessage; |
| 7 | use MediaWiki\Linker\LinkTarget; |
| 8 | use MediaWiki\Message\Message; |
| 9 | use MediaWiki\Title\TitleValue; |
| 10 | use MessageLocalizer; |
| 11 | |
| 12 | /** |
| 13 | * A topic based on morelike search (text similarity with a predefined set of reference articles). |
| 14 | */ |
| 15 | class MorelikeBasedTopic extends Topic { |
| 16 | |
| 17 | /** @var LinkTarget[] */ |
| 18 | private $referencePages; |
| 19 | |
| 20 | /** @var string */ |
| 21 | private $name; |
| 22 | |
| 23 | /** |
| 24 | * @param string $id Topic ID, e.g. 'biology'. |
| 25 | * @param LinkTarget[] $referencePages The set of reference pages defining this topic. |
| 26 | */ |
| 27 | public function __construct( $id, array $referencePages ) { |
| 28 | parent::__construct( $id ); |
| 29 | $this->referencePages = $referencePages; |
| 30 | // If setName() is somehow not called, this is better than the RawMessage constructor |
| 31 | // throwing an error. |
| 32 | $this->name = $id; |
| 33 | } |
| 34 | |
| 35 | /** |
| 36 | * Return the set of reference pages defining this topic. These are "representative" articles |
| 37 | * about the topic, and articles will be classified into the given topic based on a text |
| 38 | * similarity metric. |
| 39 | * @return LinkTarget[] |
| 40 | */ |
| 41 | public function getReferencePages(): array { |
| 42 | return $this->referencePages; |
| 43 | } |
| 44 | |
| 45 | /** @inheritDoc */ |
| 46 | public function getName( MessageLocalizer $messageLocalizer ): Message { |
| 47 | // HACK we don't localize morelike-based topics because it will be replaced by ORES topics |
| 48 | // in production, the list of ORES topics is different, and we want to avoid wasting |
| 49 | // translator time. |
| 50 | // FIXME MessageLocalizer does not work with raw messages. The language does not matter |
| 51 | // for RawMessage, but we have to set something to avoid triggering session loading. |
| 52 | return ( new RawMessage( $this->name ) )->inLanguage( 'en' ); |
| 53 | } |
| 54 | |
| 55 | /** |
| 56 | * Hack for non-localizable topic names. |
| 57 | * @param string $name Topic name as raw text |
| 58 | */ |
| 59 | public function setName( $name ) { |
| 60 | $this->name = $name; |
| 61 | } |
| 62 | |
| 63 | /** @inheritDoc */ |
| 64 | protected function toJsonArray(): array { |
| 65 | return [ |
| 66 | 'id' => $this->getId(), |
| 67 | 'name' => $this->name, |
| 68 | 'referencePages' => array_map( static function ( LinkTarget $page ) { |
| 69 | return [ $page->getNamespace(), $page->getDBkey() ]; |
| 70 | }, $this->getReferencePages() ), |
| 71 | ]; |
| 72 | } |
| 73 | |
| 74 | /** @inheritDoc */ |
| 75 | public static function newFromJsonArray( JsonUnserializer $unserializer, array $json ) { |
| 76 | $referencePages = array_map( static function ( array $page ) { |
| 77 | return new TitleValue( $page[0], $page[1] ); |
| 78 | }, $json['referencePages'] ); |
| 79 | $topic = new MorelikeBasedTopic( $json['id'], $referencePages ); |
| 80 | $topic->setName( $json['name'] ); |
| 81 | return $topic; |
| 82 | } |
| 83 | |
| 84 | } |