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<?php /** * Rescores results from a prefix search/opensearch to make sure the * exact match is the first result. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * http://www.gnu.org/copyleft/gpl.html * * @file */ use MediaWiki\MediaWikiServices; use MediaWiki\Page\PageIdentity; use MediaWiki\Title\Title; /** * An utility class to rescore search results by looking for an exact match * in the db and add the page found to the first position. * * NOTE: extracted from TitlePrefixSearch * @ingroup Search */ class SearchExactMatchRescorer { /** * @var ?string set when a redirect returned from the engine is replaced by the exact match */ private ?string $replacedRedirect; /** * Default search backend does proper prefix searching, but custom backends * may sort based on other algorithms that may cause the exact title match * to not be in the results or be lower down the list. * @param string $search the query * @param int[] $namespaces * @param string[] $srchres results * @param int $limit the max number of results to return * @return string[] munged results */ public function rescore( $search, $namespaces, $srchres, $limit ) { $this->replacedRedirect = null; // Pick namespace (based on PrefixSearch::defaultSearchBackend) $ns = in_array( NS_MAIN, $namespaces ) ? NS_MAIN : reset( $namespaces ); $t = Title::newFromText( $search, $ns ); if ( !$t || !$t->exists() ) { // No exact match so just return the search results return $srchres; } $string = $t->getPrefixedText(); $key = array_search( $string, $srchres ); if ( $key !== false ) { // Exact match was in the results so just move it to the front return $this->pullFront( $key, $srchres ); } // Exact match not in the search results so check for some redirect handling cases if ( $t->isRedirect() ) { $target = $this->getRedirectTarget( $t ); $key = array_search( $target, $srchres ); if ( $key !== false ) { // Exact match is a redirect to one of the returned matches so pull the // returned match to the front. This might look odd but the alternative // is to put the redirect in front and drop the match. The name of the // found match is often more descriptive/better formed than the name of // the redirect AND by definition they share a prefix. Hopefully this // choice is less confusing and more helpful. But it might not be. But // it is the choice we're going with for now. return $this->pullFront( $key, $srchres ); } $redirectTargetsToRedirect = $this->redirectTargetsToRedirect( $srchres ); if ( isset( $redirectTargetsToRedirect[$target] ) ) { // The exact match and something in the results list are both redirects // to the same thing! In this case we prefer the match the user typed. $this->replacedRedirect = array_splice( $srchres, $redirectTargetsToRedirect[$target], 1 )[0]; array_unshift( $srchres, $string ); return $srchres; } } else { $redirectTargetsToRedirect = $this->redirectTargetsToRedirect( $srchres ); if ( isset( $redirectTargetsToRedirect[$string] ) ) { // The exact match is the target of a redirect already in the results list so remove // the redirect from the results list and push the exact match to the front array_splice( $srchres, $redirectTargetsToRedirect[$string], 1 ); array_unshift( $srchres, $string ); return $srchres; } } // Exact match is totally unique from the other results so just add it to the front array_unshift( $srchres, $string ); // And roll one off the end if the results are too long if ( count( $srchres ) > $limit ) { array_pop( $srchres ); } return $srchres; } /** * Redirect initially returned by the search engine that got replaced by a better match: * - exact match to a redirect to the same page * - exact match to the target page * @return string|null the replaced redirect or null if nothing was replaced */ public function getReplacedRedirect(): ?string { return $this->replacedRedirect; } /** * @param string[] $titles * @return array redirect target prefixedText to index of title in titles * that is a redirect to it. */ private function redirectTargetsToRedirect( array $titles ) { $result = []; foreach ( $titles as $key => $titleText ) { $title = Title::newFromText( $titleText ); if ( !$title || !$title->isRedirect() ) { continue; } $target = $this->getRedirectTarget( $title ); if ( !$target ) { continue; } $result[$target] = $key; } return $result; } /** * Returns an array where the element of $array at index $key becomes * the first element. * @param int $key key to pull to the front * @param array $array * @return array $array with the item at $key pulled to the front */ private function pullFront( $key, array $array ) { $cut = array_splice( $array, $key, 1 ); array_unshift( $array, $cut[0] ); return $array; } /** * Get a redirect's destination from a title * @param PageIdentity $page A page to redirect. It may not redirect or even exist * @return null|string If title exists and redirects, get the destination's prefixed name */ private function getRedirectTarget( PageIdentity $page ) { $redirectStore = MediaWikiServices::getInstance()->getRedirectStore(); $redir = $redirectStore->getRedirectTarget( $page ); // Needed to get the text needed for display. $redir = Title::castFromLinkTarget( $redir ); return $redir ? $redir->getPrefixedText() : null; } }
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