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/services/SheerkaEvaluateConcept.py

@@ -5,6 +5,7 @@ from core.builtin_helpers import expect_one, only_successful, evaluate, ensure_c
 from core.concept import Concept, DoNotResolve, ConceptParts, InfiniteRecursionResolved, AllConceptParts, \
     concept_part_value
 from core.global_symbols import NotInit
+from core.rule import Rule
 from core.sheerka.services.SheerkaConceptManager import SheerkaConceptManager
 from core.sheerka.services.SheerkaExecute import ParserInput
 from core.sheerka.services.sheerka_service import BaseService
@@ -421,6 +422,9 @@ class SheerkaEvaluateConcept(BaseService):
                 else:
                     return evaluated
 
+            elif isinstance(to_resolve, Rule):
+                raise NotImplementedError()  # how to resolve rules ?
+
             # otherwise, execute all return values to find out what is the value
             else:
                 # update short term memory with current concept variables