BUG Fix incorrect text collection of __CLASS__ following an Name::class constant (#6868)

src/i18n/TextCollection/i18nTextCollector.php

@@ -556,11 +556,16 @@ class i18nTextCollector
         $inTransFn = false;
         $inConcat = false;
         $inNamespace = false;
-        $inClass = false;
+        $inClass = false; // after `class` but before `{`
         $inArrayClosedBy = false; // Set to the expected closing token, or false if not in array
         $currentEntity = array();
         $currentClass = []; // Class components
+        $previousToken = null;
+        $thisToken = null; // used to populate $previousToken on next iteration
         foreach ($tokens as $token) {
+            // Shuffle last token to $lastToken
+            $previousToken = $thisToken;
+            $thisToken = $token;
             if (is_array($token)) {
                 list($id, $text) = $token;
 
@@ -577,6 +582,10 @@ class i18nTextCollector
 
                 // Check class
                 if ($id === T_CLASS) {
+                    // Skip if previous token was '::'. E.g. 'Object::class'
+                    if (is_array($previousToken) && $previousToken[0] === T_DOUBLE_COLON) {
+                        continue;
+                    }
                     $inClass = true;
                     continue;
                 }

tests/php/i18n/i18nTextCollectorTest.php

@@ -324,7 +324,10 @@ PHP;
 namespace SilverStripe\Framework\Core;
 
 class MyClass extends Base implements SomeService {
-    public function getNewLines() {
+    public function getNewLines(\$class) {
+        if (!is_subclass_of(\$class, DataObject::class) || !Object::has_extension(\$class, Versioned::class)) {
+            return null;
+        }
         return _t(
             __CLASS__.'.NEWLINES',
             'New Lines'
@@ -455,7 +458,6 @@ PHP;
         $php = <<<PHP
 _t(static::class.'.KEY1', 'Default');
 _t(self::class.'.KEY2', 'Default');
-_t(__CLASS__.'.KEY3', 'Default');
 _t('Collectable.KEY4', 'Default');
 PHP;