SearchEngineConfig.php

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<?php

class SearchEngineConfig {

    private $config;

    private $language;

    public function __construct( Config $config, Language $lang ) {
        $this->config = $config;
        $this->language = $lang;
    }

    public function getConfig() {
        return $this->config;
    }

    public function searchableNamespaces() {
        $arr = [];
        foreach ( $this->language->getNamespaces() as $ns => $name ) {
            if ( $ns >= NS_MAIN ) {
                $arr[$ns] = $name;
            }
        }

        Hooks::run( 'SearchableNamespaces', [ &$arr ] );
        return $arr;
    }

    public function userNamespaces( $user ) {
        $arr = [];
        foreach ( $this->searchableNamespaces() as $ns => $name ) {
            if ( $user->getOption( 'searchNs' . $ns ) ) {
                $arr[] = $ns;
            }
        }

        return $arr;
    }

    public function defaultNamespaces() {
        return array_keys( $this->config->get( 'NamespacesToBeSearchedDefault' ), true );
    }

    public function getSearchTypes() {
        $alternatives = $this->config->get( 'SearchTypeAlternatives' ) ?: [];
        array_unshift( $alternatives, $this->config->get( 'SearchType' ) );

        return $alternatives;
    }

    public function getSearchType() {
        return $this->config->get( 'SearchType' );
    }

    public function namespacesAsText( $namespaces ) {
        $formatted = array_map( [ $this->language, 'getFormattedNsText' ], $namespaces );
        foreach ( $formatted as $key => $ns ) {
            if ( empty( $ns ) ) {
                $formatted[$key] = wfMessage( 'blanknamespace' )->text();
            }
        }
        return $formatted;
    }
}