SearchNearMatcher.php

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<?php
 
use MediaWiki\HookContainer\HookContainer;
use MediaWiki\HookContainer\HookRunner;
use MediaWiki\MediaWikiServices;
use MediaWiki\Page\WikiPageFactory;
use MediaWiki\User\UserNameUtils;
 
class SearchNearMatcher {
    protected $config;
 
    private $language;
 
    private $languageConverter;
 
    private $hookRunner;
 
    private $wikiPageFactory;
 
    private $userNameUtils;
 
    public function __construct( Config $config, Language $lang, HookContainer $hookContainer ) {
        $this->config = $config;
        $this->language = $lang;
        $services = MediaWikiServices::getInstance();
        $this->languageConverter = $services->getLanguageConverterFactory()
            ->getLanguageConverter( $lang );
        $this->wikiPageFactory = $services->getWikiPageFactory();
        $this->hookRunner = new HookRunner( $hookContainer );
        $this->userNameUtils = $services->getUserNameUtils();
    }
 
    public function getNearMatch( $searchterm ) {
        $title = $this->getNearMatchInternal( $searchterm );
 
        $this->hookRunner->onSearchGetNearMatchComplete( $searchterm, $title );
        return $title;
    }
 
    public function getNearMatchResultSet( $searchterm ) {
        return new SearchNearMatchResultSet( $this->getNearMatch( $searchterm ) );
    }
 
    protected function getNearMatchInternal( $searchterm ) {
        $allSearchTerms = [ $searchterm ];
 
        if ( $this->languageConverter->hasVariants() ) {
            $allSearchTerms = array_unique( array_merge(
                $allSearchTerms,
                $this->languageConverter->autoConvertToAllVariants( $searchterm )
            ) );
        }
 
        $titleResult = null;
        if ( !$this->hookRunner->onSearchGetNearMatchBefore( $allSearchTerms, $titleResult ) ) {
            return $titleResult;
        }
 
        // Most of our handling here deals with finding a valid title for the search term,
        // but almost anything starting with '#' is "valid" and points to Main_Page#searchterm.
        // Rather than doing something completely wrong, do nothing.
        if ( $searchterm === '' || $searchterm[0] === '#' ) {
            return null;
        }
 
        foreach ( $allSearchTerms as $term ) {
            # Exact match? No need to look further.
            $title = Title::newFromText( $term );
            if ( $title === null ) {
                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
            if ( $title->canExist() ) {
                $page = $this->wikiPageFactory->newFromTitle( $title );
                if ( $page->hasViewableContent() ) {
                    return $title;
                }
            }
 
            if ( !$this->hookRunner->onSearchAfterNoDirectMatch( $term, $title ) ) {
                return $title;
            }
 
            # Now try all lower case (i.e. first letter capitalized)
            $title = Title::newFromText( $this->language->lc( $term ) );
            if ( $title && $title->exists() ) {
                return $title;
            }
 
            # Now try capitalized string
            $title = Title::newFromText( $this->language->ucwords( $term ) );
            if ( $title && $title->exists() ) {
                return $title;
            }
 
            # Now try all upper case
            $title = Title::newFromText( $this->language->uc( $term ) );
            if ( $title && $title->exists() ) {
                return $title;
            }
 
            # Now try Word-Caps-Breaking-At-Word-Breaks, for hyphenated names etc
            $title = Title::newFromText( $this->language->ucwordbreaks( $term ) );
            if ( $title && $title->exists() ) {
                return $title;
            }
 
            // Give hooks a chance at better match variants
            $title = null;
            if ( !$this->hookRunner->onSearchGetNearMatch( $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 && $this->userNameUtils->isIP( $title->getText() ) )
                || $this->userNameUtils->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 = MediaWikiServices::getInstance()->getRepoGroup()->findFile( $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, $this->language->ucfirst( $title->getText() ) );
        }
 
        # Quoted term? Try without the quotes...
        $matches = [];
        if ( preg_match( '/^"([^"]+)"$/', $searchterm, $matches ) ) {
            return $this->getNearMatch( $matches[1] );
        }
 
        return null;
    }
}