refactor: Extract shared enclosing-scope label into ScopeTrait

src/Analyser/AnonymousClassNode.php

@@ -34,12 +34,7 @@ final class AnonymousClassNode
     use NodeQueryTrait;
     use PropertyUnserializeTrait;
     use RecursiveParentsTrait;
-
-    /**
-     * Scope label reported by {@see enclosingScopeName()} for an anonymous
-     * class declared outside any class-like or named function.
-     */
-    public const FILE_SCOPE = 'file scope';
+    use ScopeTrait;
 
     /** @var list<string> */
     public readonly array $layers;
@@ -88,14 +83,4 @@ public function __construct(
     ) {
         $this->layers = $layers ?: array_filter([$this->layer]);
     }
-
-    /**
-     * Label of the innermost named scope declaring this anonymous class —
-     * the enclosing class-like, else the enclosing named function — or
-     * {@see self::FILE_SCOPE} for one declared in top-level procedural code.
-     */
-    public function enclosingScopeName(): string
-    {
-        return $this->enclosingClassName ?? $this->enclosingFunctionName ?? self::FILE_SCOPE;
-    }
 }

src/Analyser/AnonymousFunctionNode.php

@@ -20,12 +20,7 @@ final class AnonymousFunctionNode
 {
     use NodeQueryTrait;
     use PropertyUnserializeTrait;
-
-    /**
-     * Scope label reported by {@see enclosingScopeName()} for an anonymous
-     * function declared outside any class-like or named function.
-     */
-    public const FILE_SCOPE = 'file scope';
+    use ScopeTrait;
 
     /** @var list<string> */
     public readonly array $layers;
@@ -70,14 +65,4 @@ public function getType(): string
     {
         return $this->isArrowFunction ? 'Arrow function' : 'Closure';
     }
-
-    /**
-     * Label of the innermost named scope declaring this anonymous function —
-     * the enclosing class-like, else the enclosing named function — or
-     * {@see self::FILE_SCOPE} for one declared in top-level procedural code.
-     */
-    public function enclosingScopeName(): string
-    {
-        return $this->enclosingClassName ?? $this->enclosingFunctionName ?? self::FILE_SCOPE;
-    }
 }

src/Analyser/ScopeTrait.php

@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Boundwize\StructArmed\Analyser;
+
+/**
+ * Enclosing-scope label shared by {@see AnonymousClassNode} and
+ * {@see AnonymousFunctionNode}.
+ *
+ * @internal
+ *
+ * @property-read string|null $enclosingClassName    Innermost named class-like the node is declared in
+ * @property-read string|null $enclosingFunctionName Innermost named function the node is declared in
+ */
+trait ScopeTrait
+{
+    /**
+     * Scope label reported by {@see enclosingScopeName()} for an anonymous
+     * class/function declared outside any class-like or named function.
+     */
+    public const FILE_SCOPE = 'file scope';
+
+    /**
+     * Label of the innermost named scope declaring this anonymous class/function —
+     * the enclosing class-like, else the enclosing named function — or
+     * {@see self::FILE_SCOPE} for one declared in top-level procedural code.
+     */
+    public function enclosingScopeName(): string
+    {
+        return $this->enclosingClassName ?? $this->enclosingFunctionName ?? self::FILE_SCOPE;
+    }
+}