Implemented a first and basic version of a Rete rule engine

tests/core/test_sheerka.py

@@ -340,7 +340,7 @@ class TestSheerkaUsingMemoryBasedSheerka(TestUsingMemoryBasedSheerka):
         sheerka.modify_concept(context, foo, to_add={"variables": {"c": None}}, to_remove={"variables": ["b"]})
         assert get_concept_attrs(foo) == ["a", "c"]
 
-        sheerka.pop_ontology()
+        sheerka.pop_ontology(context)
         assert get_concept_attrs(foo) == ["a", "b"]
 
     def test_i_can_manage_concepts_ids_on_multiple_ontology_layers(self):
@@ -356,7 +356,7 @@ class TestSheerkaUsingMemoryBasedSheerka(TestUsingMemoryBasedSheerka):
         res = sheerka.create_new_concept(context, Concept("baz"))
         assert res.body.body.id == "1003"
 
-        sheerka.pop_ontology()
+        sheerka.pop_ontology(context)
         res = sheerka.create_new_concept(context, Concept("baz"))
         assert res.body.body.id == "1002"
 
@@ -380,7 +380,7 @@ class TestSheerkaUsingMemoryBasedSheerka(TestUsingMemoryBasedSheerka):
 
         # record the ontology
         ontology = sheerka.get_ontology(context)
-        sheerka.pop_ontology()
+        sheerka.pop_ontology(context)
 
         # Create another ontology with some other values
         sheerka.push_ontology(context, "another ontology")
@@ -403,7 +403,7 @@ class TestSheerkaUsingMemoryBasedSheerka(TestUsingMemoryBasedSheerka):
         assert get_concept_attrs(foo) == ["a", "b"]
 
         # sanity check
-        sheerka.pop_ontology()
+        sheerka.pop_ontology(context)
         assert sheerka.get_by_name("foo") == foo2
         assert sheerka.get_by_name("bar") == bar
         assert sheerka.locals == {"key2": "value2"}
@@ -562,7 +562,7 @@ class TestSheerkaUsingFileBasedSheerka(TestUsingFileBasedSheerka):
         sheerka, context = self.init_test().unpack()
 
         sheerka.push_ontology(context, "to remove")
-        sheerka.pop_ontology()
+        sheerka.pop_ontology(context)
         sheerka.push_ontology(context, "new ontology")
         sheerka.push_ontology(context, "another ontology")