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<?php
/**
* Implementation of near match title search.
* TODO: split into service/implementation.
*/
class SearchNearMatcher {
/**
* @var Config
*/
protected $config;
/**
* Current language
* @var Language
*/
private $language;
public function __construct( Config $config, Language $lang ) {
$this->config = $config;
$this->language = $lang;
}
/**
* If an exact title match can be found, or a very slightly close match,
* return the title. If no match, returns NULL.
*
* @param string $searchterm
* @return Title
*/
public function getNearMatch( $searchterm ) {
$title = $this->getNearMatchInternal( $searchterm );
Hooks::run( 'SearchGetNearMatchComplete', [ $searchterm, &$title ] );
return $title;
}
/**
* Do a near match (see SearchEngine::getNearMatch) and wrap it into a
* SearchResultSet.
*
* @param string $searchterm
* @return SearchResultSet
*/
public function getNearMatchResultSet( $searchterm ) {
return new SearchNearMatchResultSet( $this->getNearMatch( $searchterm ) );
}
/**
* Really find the title match.
* @param string $searchterm
* @return null|Title
*/
protected function getNearMatchInternal( $searchterm ) {
$lang = $this->language;
$allSearchTerms = [ $searchterm ];
if ( $lang->hasVariants() ) {
$allSearchTerms = array_unique( array_merge(
$allSearchTerms,
$lang->autoConvertToAllVariants( $searchterm )
) );
}
$titleResult = null;
if ( !Hooks::run( 'SearchGetNearMatchBefore', [ $allSearchTerms, &$titleResult ] ) ) {
return $titleResult;
}
foreach ( $allSearchTerms as $term ) {
# Exact match? No need to look further.
$title = Title::newFromText( $term );
if ( is_null( $title ) ) {
return null;
}
# Try files if searching in the Media: namespace
if ( $title->getNamespace() == NS_MEDIA ) {
$title = Title::makeTitle( NS_FILE, $title->getText() );
}
if ( $title->isSpecialPage() || $title->isExternal() || $title->exists() ) {
return $title;
}
# See if it still otherwise has content is some sane sense
$page = WikiPage::factory( $title );
if ( $page->hasViewableContent() ) {
return $title;
}
if ( !Hooks::run( 'SearchAfterNoDirectMatch', [ $term, &$title ] ) ) {
return $title;
}
# Now try all lower case (i.e. first letter capitalized)
$title = Title::newFromText( $lang->lc( $term ) );
if ( $title && $title->exists() ) {
return $title;
}
# Now try capitalized string
$title = Title::newFromText( $lang->ucwords( $term ) );
if ( $title && $title->exists() ) {
return $title;
}
# Now try all upper case
$title = Title::newFromText( $lang->uc( $term ) );
if ( $title && $title->exists() ) {
return $title;
}
# Now try Word-Caps-Breaking-At-Word-Breaks, for hyphenated names etc
$title = Title::newFromText( $lang->ucwordbreaks( $term ) );
if ( $title && $title->exists() ) {
return $title;
}
// Give hooks a chance at better match variants
$title = null;
if ( !Hooks::run( 'SearchGetNearMatch', [ $term, &$title ] ) ) {
return $title;
}
}
$title = Title::newFromText( $searchterm );
# Entering an IP address goes to the contributions page
if ( $this->config->get( 'EnableSearchContributorsByIP' ) ) {
if ( ( $title->getNamespace() == NS_USER && User::isIP( $title->getText() ) )
|| User::isIP( trim( $searchterm ) ) ) {
return SpecialPage::getTitleFor( 'Contributions', $title->getDBkey() );
}
}
# Entering a user goes to the user page whether it's there or not
if ( $title->getNamespace() == NS_USER ) {
return $title;
}
# Go to images that exist even if there's no local page.
# There may have been a funny upload, or it may be on a shared
# file repository such as Wikimedia Commons.
if ( $title->getNamespace() == NS_FILE ) {
$image = wfFindFile( $title );
if ( $image ) {
return $title;
}
}
# MediaWiki namespace? Page may be "implied" if not customized.
# Just return it, with caps forced as the message system likes it.
if ( $title->getNamespace() == NS_MEDIAWIKI ) {
return Title::makeTitle( NS_MEDIAWIKI, $lang->ucfirst( $title->getText() ) );
}
# Quoted term? Try without the quotes...
$matches = [];
if ( preg_match( '/^"([^"]+)"$/', $searchterm, $matches ) ) {
return self::getNearMatch( $matches[1] );
}
return null;
}
}
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