Make sur AttributeNode attributes are used when exporting to a Graph.

Author: drupol

spec/drupol/phptree/Exporter/GraphSpec.php

@@ -6,6 +6,7 @@
 
 use drupol\phptree\Exporter\Graph;
 use drupol\phptree\Importer\Text;
+use drupol\phptree\Node\AttributeNode;
 use drupol\phptree\Node\ValueNode;
 use Graphp\GraphViz\GraphViz;
 use PhpSpec\ObjectBehavior;
@@ -36,7 +37,7 @@ public function getMatchers(): array
 
     public function it_can_generate_a_graph()
     {
-        $tree = new ValueNode('root');
+        $tree = new AttributeNode(['graphviz.label' => 'root']);
         $child1 = new ValueNode('child1');
         $child2 = new ValueNode('child2');
         $child3 = new ValueNode('child3');

src/Exporter/Graph.php

@@ -4,6 +4,7 @@
 
 namespace drupol\phptree\Exporter;
 
+use drupol\phptree\Node\AttributeNodeInterface;
 use drupol\phptree\Node\NodeInterface;
 use drupol\phptree\Node\ValueNodeInterface;
 use Fhaculty\Graph\Graph as OriginalGraph;
@@ -61,6 +62,12 @@ protected function createVertex(NodeInterface $node): Vertex
             if ($node instanceof ValueNodeInterface) {
                 $vertex->setAttribute('graphviz.label', $node->getValue());
             }
+
+            if ($node instanceof AttributeNodeInterface) {
+                foreach ($node->getAttributes() as $key => $value) {
+                    $vertex->setAttribute($key, $value);
+                }
+            }
         }
 
         return $this->getGraph()->getVertex($vertexId);