Fixed #29: Parsers: Implement parsing memoization

Fixed #77 : Parser: ShortTermMemoryParser should be called separately
Fixed #78 : Remove VariableNode usage
Fixed #79 : ConceptManager: Implement compile caching
Fixed #80 : SheerkaExecute : parsers_key is not correctly computed
Fixed #81 : ValidateConceptEvaluator : Validate concept's where and pre clauses right after the parsing
Fixed #82 : SheerkaIsAManager: isa() failed when the set as a body
Fixed #83 : ValidateConceptEvaluator : Support BNF and SYA Concepts
Fixed #84 : ExpressionParser: Implement the parser as a standard parser
Fixed #85 : Services: Give order to services
Fixed #86 : cannot manage smart_get_attr(the short, color)

tests/evaluators/test_DefConceptEvaluator.py

@@ -204,7 +204,9 @@ class TestDefConceptEvaluator(TestUsingMemoryBasedSheerka):
         assert DefConceptEvaluator.get_variables(context, concept_definition, []) == expected
 
     def test_i_can_recognize_variables_when_referencing_other_concepts(self):
-        sheerka, context, isa_concept = self.init_concepts(Concept("x is an y").def_var("x").def_var("y"))
+        sheerka, context, isa_concept = self.init_concepts(
+            Concept("x is an y", pre="is_question()").def_var("x").def_var("y")
+        )
 
         text = "def concept what x is y pre is_question() where x is an adjective as get_attr(x, y)"
         def_ret_val = DefConceptParser().parse(context, ParserInput(text))