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<?php
/**
* Implements Special:MyLanguage
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @author Niklas Laxström
* @author Siebrand Mazeland
* @copyright Copyright © 2010-2013 Niklas Laxström, Siebrand Mazeland
*/
/**
* Unlisted special page just to redirect the user to the translated version of
* a page, if it exists.
*
* Usage: [[Special:MyLanguage/Page name|link text]]
*
* @since 1.24
* @ingroup SpecialPage
*/
class SpecialMyLanguage extends RedirectSpecialArticle {
public function __construct() {
parent::__construct( 'MyLanguage' );
}
/**
* If the special page is a redirect, then get the Title object it redirects to.
* False otherwise.
*
* @param string|null $subpage
* @return Title
*/
public function getRedirect( $subpage ) {
$title = $this->findTitle( $subpage );
// Go to the main page if given invalid title.
if ( !$title ) {
$title = Title::newMainPage();
}
return $title;
}
/**
* Assuming the user's interface language is fi. Given input Page, it
* returns Page/fi if it exists, otherwise Page. Given input Page/de,
* it returns Page/fi if it exists, otherwise Page/de if it exists,
* otherwise Page.
*
* @param string|null $subpage
* @return Title|null
*/
public function findTitle( $subpage ) {
// base = title without language code suffix
// provided = the title as it was given
$base = $provided = null;
if ( $subpage !== null ) {
$provided = Title::newFromText( $subpage );
$base = $provided;
}
if ( $provided && strpos( $subpage, '/' ) !== false ) {
$pos = strrpos( $subpage, '/' );
$basepage = substr( $subpage, 0, $pos );
$code = substr( $subpage, $pos + 1 );
if ( strlen( $code ) && Language::isKnownLanguageTag( $code ) ) {
$base = Title::newFromText( $basepage );
}
}
if ( !$base ) {
// No subpage provided or base page does not exist
return null;
}
if ( $base->isRedirect() ) {
$page = new WikiPage( $base );
$base = $page->getRedirectTarget();
}
$uiCode = $this->getLanguage()->getCode();
$wikiLangCode = $this->getConfig()->get( 'LanguageCode' );
if ( $uiCode === $wikiLangCode ) {
// Short circuit when the current UI language is the
// wiki's default language to avoid unnecessary page lookups.
return $base;
}
// Check for a subpage in current UI language
$proposed = $base->getSubpage( $uiCode );
if ( $proposed && $proposed->exists() ) {
return $proposed;
}
if ( $provided !== $base && $provided->exists() ) {
// Explicit language code given and the page exists
return $provided;
}
// Check for fallback languages specified by the UI language
$possibilities = Language::getFallbacksFor( $uiCode );
foreach ( $possibilities as $lang ) {
if ( $lang !== $wikiLangCode ) {
$proposed = $base->getSubpage( $lang );
if ( $proposed && $proposed->exists() ) {
return $proposed;
}
}
}
// When all else has failed, return the base page
return $base;
}
/**
* Target can identify a specific user's language preference.
*
* @see T109724
* @since 1.27
* @return bool
*/
public function personallyIdentifiableTarget() {
return true;
}
}
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