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<?php
/**
* PrefixSearch - Handles searching prefixes of titles and finding any page
* names that match. Used largely by the OpenSearch implementation.
*
* @ingroup Search
*/
class PrefixSearch {
/**
* Do a prefix search of titles and return a list of matching page names.
*
* @param $search String
* @param $limit Integer
* @param $namespaces Array: used if query is not explicitely prefixed
* @return Array of strings
*/
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 );
}
/**
* Do a prefix search of titles and return a list of matching page names.
* @param $namespaces Array
* @param $search String
* @param $limit Integer
* @return Array of strings
*/
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;
}
/**
* Prefix search special-case for Special: namespace.
*
* @param $search String: term
* @param $limit Integer: max number of items to return
* @return Array
*/
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...
SpecialPage::initList();
SpecialPage::initAliasList();
$keys = array();
foreach( array_keys( SpecialPage::$mList ) as $page ) {
$keys[$wgContLang->caseFold( $page )] = $page;
}
foreach( $wgContLang->getSpecialPageAliases() as $page => $aliases ) {
if( !array_key_exists( $page, SpecialPage::$mList ) ) {# 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;
}
/**
* Unless overridden by PrefixSearchBackend hook...
* This is case-sensitive (First character may
* be automatically capitalized by Title::secureAndSpit()
* later on depending on $wgCapitalLinks)
*
* @param $namespaces Array: namespaces to search in
* @param $search String: term
* @param $limit Integer: max number of items to return
* @return Array of title strings
*/
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;
}
/**
* Validate an array of numerical namespace indexes
*
* @param $namespaces Array
* @return Array (default: contains only NS_MAIN)
*/
protected static function validateNamespaces($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 );
}
}
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