PrefixSearch.php

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<?php
class PrefixSearch {
        public static function titleSearch( $search, $limit, $namespaces = array() ) {
                $search = trim( $search );
                if( $search == '' ) {
                        return array(); // Return empty result
                }
                $namespaces = self::validateNamespaces( $namespaces );

                // Find a Title which is not an interwiki and is in NS_MAIN
                $title = Title::newFromText( $search );
                if( $title && $title->getInterwiki() == '' ) {
                        $ns = array( $title->getNamespace() );
                        if( $ns[0] == NS_MAIN ) {
                                $ns = $namespaces; // no explicit prefix, use default namespaces
                        }
                        return self::searchBackend(
                                $ns, $title->getText(), $limit );
                }

                // Is this a namespace prefix?
                $title = Title::newFromText( $search . 'Dummy' );
                if( $title && $title->getText() == 'Dummy'
                        && $title->getNamespace() != NS_MAIN
                        && $title->getInterwiki() == '' ) {
                        return self::searchBackend(
                                array( $title->getNamespace() ), '', $limit );
                }

                return self::searchBackend( $namespaces, $search, $limit );
        }

        protected static function searchBackend( $namespaces, $search, $limit ) {
                if( count( $namespaces ) == 1 ) {
                        $ns = $namespaces[0];
                        if( $ns == NS_MEDIA ) {
                                $namespaces = array( NS_FILE );
                        } elseif( $ns == NS_SPECIAL ) {
                                return self::specialSearch( $search, $limit );
                        }
                }
                $srchres = array();
                if( wfRunHooks( 'PrefixSearchBackend', array( $namespaces, $search, $limit, &$srchres ) ) ) {
                        return self::defaultSearchBackend( $namespaces, $search, $limit );
                }
                return $srchres;
        }

        protected static function specialSearch( $search, $limit ) {
                global $wgContLang;

                # normalize searchKey, so aliases with spaces can be found - bug 25675
                $search = str_replace( ' ', '_', $search );

                $searchKey = $wgContLang->caseFold( $search );

                // Unlike SpecialPage itself, we want the canonical forms of both
                // canonical and alias title forms...
                $keys = array();
                foreach( SpecialPageFactory::getList() as $page => $class ) {
                        $keys[$wgContLang->caseFold( $page )] = $page;
                }

                foreach( $wgContLang->getSpecialPageAliases() as $page => $aliases ) {
                        if( !array_key_exists( $page, SpecialPageFactory::getList() ) ) {# bug 20885
                                continue;
                        }

                        foreach( $aliases as $alias ) {
                                $keys[$wgContLang->caseFold( $alias )] = $alias;
                        }
                }
                ksort( $keys );

                $srchres = array();
                foreach( $keys as $pageKey => $page ) {
                        if( $searchKey === '' || strpos( $pageKey, $searchKey ) === 0 ) {
                                wfSuppressWarnings();
                                // bug 27671: 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'
                                $srchres[] = Title::makeTitleSafe( NS_SPECIAL, $page )->getPrefixedText();
                                wfRestoreWarnings();
                        }

                        if( count( $srchres ) >= $limit ) {
                                break;
                        }
                }

                return $srchres;
        }

        protected static function defaultSearchBackend( $namespaces, $search, $limit ) {
                $ns = array_shift( $namespaces ); // support only one namespace
                if( in_array( NS_MAIN, $namespaces ) ) {
                        $ns = NS_MAIN; // if searching on many always default to main
                }

                // Prepare nested request
                $req = new FauxRequest( array(
                        'action' => 'query',
                        'list' => 'allpages',
                        'apnamespace' => $ns,
                        'aplimit' => $limit,
                        'apprefix' => $search
                ));

                // Execute
                $module = new ApiMain( $req );
                $module->execute();

                // Get resulting data
                $data = $module->getResultData();

                // Reformat useful data for future printing by JSON engine
                $srchres = array ();
                foreach ( (array)$data['query']['allpages'] as $pageinfo ) {
                        // Note: this data will no be printable by the xml engine
                        // because it does not support lists of unnamed items
                        $srchres[] = $pageinfo['title'];
                }

                return $srchres;
        }

        protected static function validateNamespaces( $namespaces ) {
                global $wgContLang;

                // We will look at each given namespace against wgContLang namespaces
                $validNamespaces = $wgContLang->getNamespaces();
                if( is_array( $namespaces ) && count( $namespaces ) > 0 ) {
                        $valid = array();
                        foreach ( $namespaces as $ns ) {
                                if( is_numeric( $ns ) && array_key_exists( $ns, $validNamespaces ) ) {
                                        $valid[] = $ns;
                                }
                        }
                        if( count( $valid ) > 0 ) {
                                return $valid;
                        }
                }

                return array( NS_MAIN );
        }
}