public function __construct(SearchConfig $config, $limit) { parent::__construct(new DummyConnection(), $limit, $config, array(NS_MAIN), null, "dummy"); }
/** * This implementation will run the completion suggester if it's enabled and if the * query is for NS_MAIN. Fallback to SearchEngine default implemention otherwise. * * @param string $search the user query * @return SearchSuggestionSet the suggestions */ public function searchSuggestions($search) { $config = ConfigFactory::getDefaultInstance()->makeConfig('CirrusSearch'); $useCompletionSuggester = $config->getElement('CirrusSearchUseCompletionSuggester'); $context = RequestContext::getMain(); $request = $context->getRequest(); // Allow experimentation with query parameters if ($request && $request->getVal('cirrusUseCompletionSuggester') === 'yes') { $useCompletionSuggester = true; } if (!$useCompletionSuggester) { // Completion suggester is not enabled, fallback to // default implementation return $this->searchSuggestionsPrefixSearchFallback($search); } // We use Title to extract namespace from a Title string // We append a random letter behind just in case the search // string ends with ':'. $title = Title::newFromText($search . "A"); if ($title->getNamespace() != NS_MAIN || count($this->namespaces) != 1 || reset($this->namespaces) != NS_MAIN) { // Fallback to prefix search if we are not on content namespace return $this->searchSuggestionsPrefixSearchFallback($search); } $user = $context->getUser(); // offset is omitted, searchSuggestion does not support // scrolling results $suggester = new CompletionSuggester($this->connection, $this->limit, $config, $this->namespaces, $user, $this->indexBaseName); // Not really useful, mostly for testing purpose $variants = $request->getArray('cirrusCompletionSuggesterVariant'); if (empty($variants)) { global $wgContLang; $variants = $wgContLang->autoConvertToAllVariants($search); } else { if (count($variants) > 3) { // We should not allow too many variants $variants = array_slice($variants, 0, 3); } } $response = $suggester->suggest($search, $variants); if ($response->isOK()) { // Errors will be logged, let's try the exact db match $suggestions = $response->getValue(); } else { $suggestions = SearchSuggestionSet::emptySuggestionSet(); } // preload the titles with LinkBatch $titles = $suggestions->map(function ($sugg) { return $sugg->getSuggestedTitle(); }); $lb = new LinkBatch($titles); $lb->setCaller(__METHOD__); $lb->execute(); $results = $suggestions->map(function ($sugg) { return $sugg->getSuggestedTitle()->getPrefixedText(); }); // now we can trim $search = trim($search); // Rescore results with an exact title match $rescorer = new SearchExactMatchRescorer(); $rescoredResults = $rescorer->rescore($search, $this->namespaces, $results, $this->limit); if (count($rescoredResults) > 0) { $found = array_search($rescoredResults[0], $results); if ($found === false) { // If the first result is not in the previous array it // means that we found a new exact match $exactMatch = SearchSuggestion::fromTitle(0, Title::newFromText($rescoredResults[0])); $suggestions->prepend($exactMatch); $suggestions->shrink($this->limit); } else { // if the first result is not the same we need to rescore if ($found > 0) { $suggestions->rescore($found); } } } return $suggestions; }