pyolian: Add a method to get the hierarchy of extensions

Summary:
To be used by the test generator

Depends on D10420

Test Plan: test in the diff

Reviewers: DaveMDS, herb, segfaultxavi, felipealmeida

Reviewed By: felipealmeida

Subscribers: cedric, brunobelo, #reviewers, felipealmeida, #committers

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D10421

src/scripts/pyolian/eolian.py

@@ -732,6 +732,23 @@ class Class(Object):
     def extensions(self):
         return Iterator(Class, lib.eolian_class_extensions_get(self))
 
+    @cached_property
+    def extensions_hierarchy(self):
+        visited = set()
+        queue = [ext for ext in self.extensions]
+
+        while queue:
+            current = queue.pop()
+
+            if current in visited:
+                continue
+
+            visited.add(current)
+
+            queue.extend(current.extensions)
+
+        return visited
+
     @cached_property
     def inherits_full(self):
         li = []

src/scripts/pyolian/test_eolian.py

@@ -704,3 +704,11 @@ class TestEolianInherits(object):
     def test_inherits_full(self, eolian_db):
         cls = eolian_db.class_by_name_get('Efl.Ui.Widget')
         assert 'Efl.Object' in cls.inherits_full
+
+    def test_extensions_hierarchy(self, eolian_db):
+        cls = eolian_db.class_by_name_get('Efl.Ui.Widget')
+
+        # inherited extension
+        assert any(x.name == 'Efl.Gfx.Stack' for x in cls.extensions_hierarchy)
+        # direct extension
+        assert any(x.name == 'Efl.Access.Object' for x in cls.extensions_hierarchy)