Merge "RevisionStore, fix loadSlotContent with no $blobFlags"

[lhc/web/wiklou.git] / includes / specials / SpecialMyLanguage.php

diff --git a/includes/specials/SpecialMyLanguage.php b/includes/specials/SpecialMyLanguage.php
index 6cea158..37d96f4 100644 (file)
--- a/includes/specials/SpecialMyLanguage.php
+++ b/includes/specials/SpecialMyLanguage.php
@@ -41,11 +41,11 @@ class SpecialMyLanguage extends RedirectSpecialArticle {
         * If the special page is a redirect, then get the Title object it redirects to.
         * False otherwise.
         *
-        * @param string $par Subpage string
-        * @return Title|bool
+        * @param string|null $subpage
+        * @return Title
         */
-       public function getRedirect( $par ) {
-               $title = $this->findTitle( $par );
+       public function getRedirect( $subpage ) {
+               $title = $this->findTitle( $subpage );
                // Go to the main page if given invalid title.
                if ( !$title ) {
                        $title = Title::newMainPage();
@@ -59,24 +59,29 @@ class SpecialMyLanguage extends RedirectSpecialArticle {
         * it returns Page/fi if it exists, otherwise Page/de if it exists,
         * otherwise Page.
         *
-        * @param string $par
+        * @param string|null $subpage
         * @return Title|null
         */
-       public function findTitle( $par ) {
+       public function findTitle( $subpage ) {
                // base = title without language code suffix
                // provided = the title as it was given
-               $base = $provided = Title::newFromText( $par );
+               $base = $provided = null;
+               if ( $subpage !== null ) {
+                       $provided = Title::newFromText( $subpage );
+                       $base = $provided;
+               }
 
-               if ( $base && strpos( $par, '/' ) !== false ) {
-                       $pos = strrpos( $par, '/' );
-                       $basepage = substr( $par, 0, $pos );
-                       $code = substr( $par, $pos + 1 );
+               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;
                }
 
@@ -86,13 +91,48 @@ class SpecialMyLanguage extends RedirectSpecialArticle {
                }
 
                $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 ( $uiCode !== $this->getConfig()->get( 'LanguageCode' ) && $proposed && $proposed->exists() ) {
+               if ( $proposed && $proposed->exists() ) {
                        return $proposed;
-               } elseif ( $provided && $provided->exists() ) {
+               }
+
+               if ( $provided !== $base && $provided->exists() ) {
+                       // Explicit language code given and the page exists
                        return $provided;
-               } else {
-                       return $base;
                }
+
+               // 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;
        }
 }