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PrefixSearch.php
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PrefixSearch.php
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<?php
/**
* Prefix search of page names.
*
* 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\HookContainer\HookRunner;
use MediaWiki\MediaWikiServices;
use MediaWiki\Title\MediaWikiTitleCodec;
use MediaWiki\Title\Title;
use Wikimedia\Rdbms\IExpression;
use Wikimedia\Rdbms\LikeValue;
/**
* Handles searching prefixes of titles and finding any page
* names that match. Used largely by the OpenSearch implementation.
* @deprecated Since 1.27, Use SearchEngine::defaultPrefixSearch or SearchEngine::completionSearch
*
* @stable to extend
* @ingroup Search
*/
abstract class PrefixSearch {
/**
* Do a prefix search of titles and return a list of matching page names.
*
* @param string $search
* @param int $limit
* @param array $namespaces Used if query is not explicitly prefixed
* @param int $offset How many results to offset from the beginning
* @return (Title|string)[]
*/
public function search( $search, $limit, $namespaces = [], $offset = 0 ) {
$search = trim( $search );
if ( $search == '' ) {
return []; // Return empty result
}
$hasNamespace = SearchEngine::parseNamespacePrefixes( $search, false, true );
if ( $hasNamespace !== false ) {
[ $search, $namespaces ] = $hasNamespace;
}
return $this->searchBackend( $namespaces, $search, $limit, $offset );
}
/**
* Do a prefix search for all possible variants of the prefix
* @param string $search
* @param int $limit
* @param array $namespaces
* @param int $offset How many results to offset from the beginning
*
* @return (Title|string)[]
*/
public function searchWithVariants( $search, $limit, array $namespaces, $offset = 0 ) {
$searches = $this->search( $search, $limit, $namespaces, $offset );
// if the content language has variants, try to retrieve fallback results
$fallbackLimit = $limit - count( $searches );
if ( $fallbackLimit > 0 ) {
$services = MediaWikiServices::getInstance();
$fallbackSearches = $services->getLanguageConverterFactory()
->getLanguageConverter( $services->getContentLanguage() )
->autoConvertToAllVariants( $search );
$fallbackSearches = array_diff( array_unique( $fallbackSearches ), [ $search ] );
foreach ( $fallbackSearches as $fbs ) {
$fallbackSearchResult = $this->search( $fbs, $fallbackLimit, $namespaces );
$searches = array_merge( $searches, $fallbackSearchResult );
$fallbackLimit -= count( $fallbackSearchResult );
if ( $fallbackLimit == 0 ) {
break;
}
}
}
return $searches;
}
/**
* When implemented in a descendant class, receives an array of Title objects and returns
* either an unmodified array or an array of strings corresponding to titles passed to it.
*
* @param Title[] $titles
* @return (Title|string)[]
*/
abstract protected function titles( array $titles );
/**
* When implemented in a descendant class, receives an array of titles as strings and returns
* either an unmodified array or an array of Title objects corresponding to strings received.
*
* @param string[] $strings
* @return (Title|string)[]
*/
abstract protected function strings( array $strings );
/**
* Do a prefix search of titles and return a list of matching page names.
* @param int[] $namespaces
* @param string $search
* @param int $limit
* @param int $offset How many results to offset from the beginning
* @return (Title|string)[]
*/
protected function searchBackend( $namespaces, $search, $limit, $offset ) {
if ( count( $namespaces ) == 1 ) {
$ns = $namespaces[0];
if ( $ns == NS_MEDIA ) {
$namespaces = [ NS_FILE ];
} elseif ( $ns == NS_SPECIAL ) {
return $this->titles( $this->specialSearch( $search, $limit, $offset ) );
}
}
$srchres = [];
if ( ( new HookRunner( MediaWikiServices::getInstance()->getHookContainer() ) )->onPrefixSearchBackend(
$namespaces, $search, $limit, $srchres, $offset )
) {
return $this->titles( $this->defaultSearchBackend( $namespaces, $search, $limit, $offset ) );
}
return $this->strings(
$this->handleResultFromHook( $srchres, $namespaces, $search, $limit, $offset ) );
}
private function handleResultFromHook( $srchres, $namespaces, $search, $limit, $offset ) {
if ( $offset === 0 ) {
// Only perform exact db match if offset === 0
// This is still far from perfect but at least we avoid returning the
// same title again and again when the user is scrolling with a query
// that matches a title in the db.
$rescorer = new SearchExactMatchRescorer();
$srchres = $rescorer->rescore( $search, $namespaces, $srchres, $limit );
}
return $srchres;
}
/**
* Prefix search special-case for Special: namespace.
*
* @param string $search Term
* @param int $limit Max number of items to return
* @param int $offset Number of items to offset
* @return array
*/
protected function specialSearch( $search, $limit, $offset ) {
$searchParts = explode( '/', $search, 2 );
$searchKey = $searchParts[0];
$subpageSearch = $searchParts[1] ?? null;
// Handle subpage search separately.
$spFactory = MediaWikiServices::getInstance()->getSpecialPageFactory();
if ( $subpageSearch !== null ) {
// Try matching the full search string as a page name
$specialTitle = Title::makeTitleSafe( NS_SPECIAL, $searchKey );
if ( !$specialTitle ) {
return [];
}
$special = $spFactory->getPage( $specialTitle->getText() );
if ( $special ) {
$subpages = $special->prefixSearchSubpages( $subpageSearch, $limit, $offset );
return array_map( [ $specialTitle, 'getSubpage' ], $subpages );
} else {
return [];
}
}
# normalize searchKey, so aliases with spaces can be found - T27675
$contLang = MediaWikiServices::getInstance()->getContentLanguage();
$searchKey = str_replace( ' ', '_', $searchKey );
$searchKey = $contLang->caseFold( $searchKey );
// Unlike SpecialPage itself, we want the canonical forms of both
// canonical and alias title forms...
$keys = [];
$listedPages = $spFactory->getListedPages();
foreach ( $listedPages as $page => $_obj ) {
$keys[$contLang->caseFold( $page )] = [ 'page' => $page, 'rank' => 0 ];
}
foreach ( $contLang->getSpecialPageAliases() as $page => $aliases ) {
// Exclude localisation aliases for pages that are not defined (T22885),
// e.g. if an extension registers a page based on site configuration.
if ( !in_array( $page, $spFactory->getNames() ) ) {
continue;
}
// Exclude aliases for unlisted pages
if ( !isset( $listedPages[ $page ] ) ) {
continue;
}
foreach ( $aliases as $key => $alias ) {
$keys[$contLang->caseFold( $alias )] = [ 'page' => $alias, 'rank' => $key ];
}
}
ksort( $keys );
$matches = [];
foreach ( $keys as $pageKey => $page ) {
if ( $searchKey === '' || strpos( $pageKey, $searchKey ) === 0 ) {
// T29671: Don't use SpecialPage::getTitleFor() here because it
// localizes its input leading to searches for e.g. Special:All
// returning Spezial:MediaWiki-Systemnachrichten and returning
// Spezial:Alle_Seiten twice when $wgLanguageCode == 'de'
$matches[$page['rank']][] = Title::makeTitleSafe( NS_SPECIAL, $page['page'] );
if ( isset( $matches[0] ) && count( $matches[0] ) >= $limit + $offset ) {
// We have enough items in primary rank, no use to continue
break;
}
}
}
// Ensure keys are in order
ksort( $matches );
// Flatten the array
$matches = array_reduce( $matches, 'array_merge', [] );
return array_slice( $matches, $offset, $limit );
}
/**
* Unless overridden by PrefixSearchBackend hook...
* This is case-sensitive (First character may
* be automatically capitalized by Title::secureAndSpit()
* later on depending on $wgCapitalLinks)
*
* @param int[]|null $namespaces Namespaces to search in
* @param string $search Term
* @param int $limit Max number of items to return
* @param int $offset Number of items to skip
* @return Title[]
*/
public function defaultSearchBackend( $namespaces, $search, $limit, $offset ) {
if ( !$namespaces ) {
$namespaces = [ NS_MAIN ];
}
if ( in_array( NS_SPECIAL, $namespaces ) ) {
// For now, if special is included, ignore the other namespaces
return $this->specialSearch( $search, $limit, $offset );
}
// Construct suitable prefix for each namespace. They differ in cases where
// some namespaces always capitalize and some don't.
$prefixes = [];
// Allow to do a prefix search for e.g. "Talk:"
if ( $search === '' ) {
$prefixes[$search] = $namespaces;
} else {
// Don't just ignore input like "[[Foo]]", but try to search for "Foo"
$search = preg_replace( MediaWikiTitleCodec::getTitleInvalidRegex(), '', $search );
foreach ( $namespaces as $namespace ) {
$title = Title::makeTitleSafe( $namespace, $search );
if ( $title ) {
$prefixes[ $title->getDBkey() ][] = $namespace;
}
}
}
if ( !$prefixes ) {
return [];
}
$services = MediaWikiServices::getInstance();
$dbr = $services->getConnectionProvider()->getReplicaDatabase();
// Often there is only one prefix that applies to all requested namespaces,
// but sometimes there are two if some namespaces do not always capitalize.
$conds = [];
foreach ( $prefixes as $prefix => $namespaces ) {
$expr = $dbr->expr( 'page_namespace', '=', $namespaces );
if ( $prefix !== '' ) {
$expr = $expr->and(
'page_title',
IExpression::LIKE,
new LikeValue( (string)$prefix, $dbr->anyString() )
);
}
$conds[] = $expr;
}
$queryBuilder = $dbr->newSelectQueryBuilder()
->select( [ 'page_id', 'page_namespace', 'page_title' ] )
->from( 'page' )
->where( $dbr->orExpr( $conds ) )
->orderBy( [ 'page_title', 'page_namespace' ] )
->limit( $limit )
->offset( $offset );
$res = $queryBuilder->caller( __METHOD__ )->fetchResultSet();
return iterator_to_array( $services->getTitleFactory()->newTitleArrayFromResult( $res ) );
}
}

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