Implemented some enhancement request and fixed some bugs

Fixed #2 : Variables are not recognized when inside a rule token
Fixed #15 : Rule: rete attributes are lost when a new ontology is created
Fixed #14 : ReteNetwork: Format rules must not be added to Rete network
Fixed #16 : DefConcept: Variables are not recognized when they are keyword arguments
Fixed #4 : Comparison are not correctly set when comparison property is a concept
Fixed #14 : Parser: merge FunctionParser.NamesNode and ExpressionParser.NamesNode
Fixed #18 : Parser: Add SourceCodeNode test to UnrecognizedNodeParser
Fixed #20 : At startup Number concept is saved in db a numerous number of time
Fixed #21 : CacheManager: I can remove all elements from a ListIfNeededCache and fill it again
Fixed #22 : CacheManager: I can remove all elements from a SetCache and fill it again
Fixed #23 : HistoryManager: history() no longer works
Fixed #24 : HistoryManager: history() no longer works after creating an exec rule
Fixed #25 : SheerkaMemory: Use MemoryObject instead of sheerka.local
Fixed #26 : Debugger: add the list all available services..
Fixed #27 : CONCEPTS_GRAMMARS_ENTRY does not seems to be in use any more
Fixed #28 : Give order to services

src/core/sheerka/services/SheerkaConceptManager.py

@@ -98,6 +98,8 @@ class SheerkaConceptManager(BaseService):
     CONCEPTS_BY_FIRST_KEYWORD_ENTRY = "ConceptManager:Concepts_By_First_Keyword"
     RESOLVED_CONCEPTS_BY_FIRST_KEYWORD_ENTRY = "ConceptManager:Resolved_Concepts_By_First_Keyword"
 
+    CONCEPTS_BNF_DEFINITIONS_ENTRY = "ConceptManager:Concepts_BNF_Definitions"
+
     def __init__(self, sheerka):
         super().__init__(sheerka, order=11)
         self.forbidden_meta = {"is_builtin", "key", "id", "props", "variables"}
@@ -117,6 +119,8 @@ class SheerkaConceptManager(BaseService):
         self.sheerka.bind_service_method(self.get_by_id, False, visible=False)
         self.sheerka.bind_service_method(self.is_not_a_variable, False, visible=False)
         self.sheerka.bind_service_method(self.get_concepts_by_first_token, False, visible=False)
+        self.sheerka.bind_service_method(self.get_concepts_bnf_definitions, False, visible=False)
+        self.sheerka.bind_service_method(self.clear_bnf_definition, True, visible=False)
 
         register_concept_cache = self.sheerka.om.register_concept_cache
 
@@ -141,6 +145,9 @@ class SheerkaConceptManager(BaseService):
         cache = DictionaryCache().auto_configure(self.RESOLVED_CONCEPTS_BY_FIRST_KEYWORD_ENTRY)
         self.sheerka.om.register_cache(self.RESOLVED_CONCEPTS_BY_FIRST_KEYWORD_ENTRY, cache, persist=False)
 
+        cache = Cache().auto_configure(self.CONCEPTS_BNF_DEFINITIONS_ENTRY)
+        self.sheerka.om.register_cache(self.CONCEPTS_BNF_DEFINITIONS_ENTRY, cache, persist=False)
+
     def initialize_deferred(self, context, is_first_time):
         if is_first_time:
             self.sheerka.om.put(self.sheerka.OBJECTS_IDS_ENTRY, self.USER_CONCEPTS_IDS, 1000)
@@ -244,7 +251,7 @@ class SheerkaConceptManager(BaseService):
         # TODO : this line seems to be useless
         # The grammar is never reset
         if concept.get_bnf() and init_bnf_ret_value is not None and init_bnf_ret_value.status:
-            sheerka.cache_manager.clear(sheerka.CONCEPTS_GRAMMARS_ENTRY)
+            sheerka.cache_manager.clear(self.CONCEPTS_BNF_DEFINITIONS_ENTRY)
 
         # publish the new concept
         sheerka.publish(context, EVENT_CONCEPT_CREATED, concept)
@@ -509,7 +516,7 @@ class SheerkaConceptManager(BaseService):
 
         for concept_id in refs:
             # remove the grammar entry so that it can be recreated
-            self.sheerka.om.delete(self.sheerka.CONCEPTS_GRAMMARS_ENTRY, concept_id)
+            self.sheerka.om.delete(self.CONCEPTS_BNF_DEFINITIONS_ENTRY, concept_id)
 
             # reset the bnf definition if needed
             if modified_concept:
@@ -559,6 +566,12 @@ class SheerkaConceptManager(BaseService):
         """
         return self.sheerka.om.get(self.sheerka.CONCEPTS_BY_NAME_ENTRY, name) is NotFound
 
+    def clear_bnf_definition(self, concept_id=None):
+        if concept_id:
+            self.sheerka.om.delete(self.CONCEPTS_BNF_DEFINITIONS_ENTRY, concept_id)
+        else:
+            self.sheerka.om.clear(self.CONCEPTS_BNF_DEFINITIONS_ENTRY)
+
     @staticmethod
     def _name_has_changed(to_add):
         if to_add is None or "meta" not in to_add:
@@ -839,3 +852,6 @@ class SheerkaConceptManager(BaseService):
 
         return core.utils.make_unique(result + custom_concepts,
                                       lambda c: c.concept.id if hasattr(c, "concept") else c.id)
+
+    def get_concepts_bnf_definitions(self):
+        return self.sheerka.om.current_cache_manager().caches[self.CONCEPTS_BNF_DEFINITIONS_ENTRY].cache