Fixed #101 : Implement PLURIAL

Fixed #103 : Implement PlurialNodeParser
Fixed #104 : Implement dynamic concept
Fixed #107 : PrepareEvalxxxEvaluator: context hints are lost on a second evaluation

src/evaluators/PrepareEvalGlobalTruthEvaluator.py

@@ -1,8 +1,9 @@
 from core.builtin_concepts import BuiltinConcepts
 from evaluators.BaseEvaluator import OneReturnValueEvaluator
+from evaluators.PrepareEvalCommon import PrepareEvalCommon
 
 
-class PrepareEvalGlobalTruthEvaluator(OneReturnValueEvaluator):
+class PrepareEvalGlobalTruthEvaluator(OneReturnValueEvaluator, PrepareEvalCommon):
     """
     To recognize when the user input is a global truth
     """
@@ -39,11 +40,11 @@ class PrepareEvalGlobalTruthEvaluator(OneReturnValueEvaluator):
             self.name,
             True, sheerka.new(BuiltinConcepts.USER_INPUT, body=self.inner_text, user_name=context.event.user_id))
 
-        root = context.get_parents(lambda ec: ec.action in (BuiltinConcepts.EVALUATING_CONCEPT,
-                                                            BuiltinConcepts.PROCESS_INPUT))
-        root = root[0] if root else context
-        root.add_to_protected_hints(BuiltinConcepts.EVAL_GLOBAL_TRUTH_REQUESTED)
-        root.add_to_protected_hints(BuiltinConcepts.EVAL_BODY_REQUESTED)
-        root.add_to_protected_hints(BuiltinConcepts.RETURN_BODY_REQUESTED)
+        self.update_context_hints(context,
+                                  self.inner_text, [
+                                      BuiltinConcepts.EVAL_GLOBAL_TRUTH_REQUESTED,
+                                      BuiltinConcepts.EVAL_BODY_REQUESTED,
+                                      BuiltinConcepts.RETURN_BODY_REQUESTED
+                                  ])
 
         return new_text_to_parse