CrossLanguageTranslationSearchQuery.php
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CrossLanguageTranslationSearchQuery.php
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	<?php
	declare( strict_types = 1 );

	namespace MediaWiki\Extension\Translate\TtmServer;

	use Elastica\Document;
	use Elastica\ResultSet;
	use MediaWiki\Extension\Translate\MessageLoading\MessageCollection;
	use MediaWiki\Extension\Translate\MessageLoading\MessageDefinitions;
	use MediaWiki\Extension\Translate\MessageLoading\MessageHandle;
	use MediaWiki\Title\Title;

	/**
	* Cross Language Translation Search.
	*
	* @license GPL-2.0-or-later
	* @ingroup TTMServer
	*/
	class CrossLanguageTranslationSearchQuery {
	private SearchableTtmServer $server;
	private array $params;
	private ?ResultSet $resultSet = null;
	private int $total = 0;
	private array $hl = [ '', '' ];

	public function __construct( array $params, SearchableTtmServer $server ) {
	$this->params = $params;
	$this->server = $server;
	}

	public function getDocuments(): array {
	$documents = [];
	$offset = $this->params['offset'];
	$limit = $this->params['limit'];

	$options = $this->params;
	$options['language'] = $this->params['sourcelanguage'];
	// Use a bigger limit that what was requested, since we are likely to throw away many
	// results in the local filtering step at extractMessages
	$options['limit'] = $limit * 10;
	// TODO: the real offset should be communicated to the frontend. It currently assumes
	// next offset is current offset + limit and previous one is current offset - limit.
	// It might be difficult to fix scrolling results backwards. For now we handle offset
	// locally.
	$options['offset'] = 0;

	// @phan-suppress-next-line PhanUndeclaredMethod
	$search = $this->server->createSearch( $this->params['query'], $options, $this->hl );
	$scroll = $search->scroll( '5s' );

	// Used for aggregations. Only the first scroll response has them.
	$this->resultSet = null;

	foreach ( $scroll as $resultSet ) {
	if ( !$this->resultSet ) {
	$this->resultSet = $resultSet;
	$this->total = $resultSet->getTotalHits();
	}

	$results = $this->extractMessages( $resultSet->getDocuments() );
	$documents = array_merge( $documents, $results );

	$count = count( $documents );

	if ( $count >= $offset + $limit ) {
	break;
	}
	}

	if ( !$this->resultSet ) {
	// No hits for documents, just set the result set.
	$this->resultSet = $scroll->current();
	$this->total = $scroll->current()->getTotalHits();
	}

	// clear was introduced in Elastica 5.3.1, but Elastica extension uses 5.3.0
	if ( is_callable( [ $scroll, 'clear' ] ) ) {
	$scroll->clear();
	}
	return array_slice( $documents, $offset, $limit );
	}

	/**
	* Extract messages from the documents and build message definitions.
	* Create a message collection from the definitions in the target language.
	* Filter the message collection to get filtered messages.
	* Slice messages according to limit and offset given.
	* @param Document[] $documents
	*/
	private function extractMessages( array $documents ): array {
	$messages = $ret = [];

	$language = $this->params['language'];
	foreach ( $documents as $document ) {
	$data = $document->getData();

	// @phan-suppress-next-line PhanUndeclaredMethod
	if ( !$this->server->isLocalSuggestion( $data ) ) {
	continue;
	}

	$title = Title::newFromText( $data['localid'] );
	if ( !$title ) {
	continue;
	}

	$handle = new MessageHandle( $title );
	if ( !$handle->isValid() ) {
	continue;
	}

	$key = $title->getNamespace() . ':' . $title->getDBkey();
	$messages[$key] = $data['content'];
	}

	$definitions = new MessageDefinitions( $messages );
	$collection = MessageCollection::newFromDefinitions( $definitions, $language );

	$filter = $this->params['filter'];
	if ( $filter === 'untranslated' ) {
	$collection->filter( 'hastranslation', true );
	} elseif ( in_array( $filter, $this->getAvailableFilters() ) ) {
	$collection->filter( $filter, false );
	}

	if ( $filter === 'translated' \|\| $filter === 'fuzzy' ) {
	$collection->loadTranslations();
	}

	foreach ( $collection->keys() as $messageKey => $titleValue ) {
	$title = Title::newFromLinkTarget( $titleValue );

	$result = [];
	$result['content'] = $messages[$messageKey];
	if ( $filter === 'translated' \|\| $filter === 'fuzzy' ) {
	$result['content'] = $collection[$messageKey]->translation();
	}
	$handle = new MessageHandle( $title );
	$result['localid'] = $handle->getTitleForBase()->getPrefixedText();
	$result['language'] = $language;

	$ret[] = $result;
	}

	return $ret;
	}

	public function getAvailableFilters(): array {
	return [
	'translated',
	'fuzzy',
	'untranslated'
	];
	}

	public function getTotalHits(): int {
	return $this->total;
	}

	public function getResultSet(): ResultSet {
	return $this->resultSet;
	}
	}

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