Fixed #30 : Add variable support in BNF concept definition

Fixed #31 : Add regex support in BNF Concept
Fixed #33 : Do not memorize object during restore

src/core/sheerka/Sheerka.py

@@ -734,7 +734,7 @@ class Sheerka(Concept):
         if not isinstance(obj, Concept):
             return True
 
-        return obj.key not in (BuiltinConcepts.UNKNOWN_CONCEPT, BuiltinConcepts.UNKNOWN_RULE)
+        return obj.key not in (None, BuiltinConcepts.UNKNOWN_CONCEPT, BuiltinConcepts.UNKNOWN_RULE)
 
     @staticmethod
     def isinstance(a, b):
@@ -879,6 +879,13 @@ class Sheerka(Concept):
 
         return concept
 
+    @staticmethod
+    def deepdiff(a, b):
+        from deepdiff import DeepDiff
+        ddiff = DeepDiff(a, b, ignore_order=True)
+        print(ddiff)
+        return ddiff
+
 
 def to_profile():
     sheerka = Sheerka()