Implemented a first and basic version of a Rete rule engine

src/core/sheerka/services/SheerkaConceptManager.py

@@ -12,8 +12,7 @@ from core.builtin_concepts_ids import BuiltinConcepts, AllBuiltinConcepts, Built
 from core.builtin_helpers import ensure_concept, ensure_bnf
 from core.concept import Concept, DEFINITION_TYPE_DEF, DEFINITION_TYPE_BNF, freeze_concept_attrs, ConceptMetadata, \
     VARIABLE_PREFIX
-from core.error import ErrorObj
-from core.global_symbols import EVENT_CONCEPT_CREATED, NotInit, NotFound
+from core.global_symbols import EVENT_CONCEPT_CREATED, NotInit, NotFound, ErrorObj, EVENT_CONCEPT_DELETED
 from core.sheerka.services.sheerka_service import BaseService
 from core.tokenizer import Tokenizer, TokenKind
 from sdp.sheerkaDataProvider import SheerkaDataProviderDuplicateKeyError
@@ -100,7 +99,7 @@ class SheerkaConceptManager(BaseService):
     RESOLVED_CONCEPTS_BY_FIRST_KEYWORD_ENTRY = "ConceptManager:Resolved_Concepts_By_First_Keyword"
 
     def __init__(self, sheerka):
-        super().__init__(sheerka)
+        super().__init__(sheerka, order=11)
         self.forbidden_meta = {"is_builtin", "key", "id", "props", "variables"}
         self.allowed_meta = {attr for attr in vars(ConceptMetadata) if
                              not attr.startswith("_") and attr not in self.forbidden_meta}
@@ -147,7 +146,7 @@ class SheerkaConceptManager(BaseService):
             self.sheerka.om.put(self.sheerka.OBJECTS_IDS_ENTRY, self.USER_CONCEPTS_IDS, 1000)
 
         # initialize the dictionary of first tokens
-        self.sheerka.om.get(self.CONCEPTS_BY_FIRST_KEYWORD_ENTRY, None) # to init the cache with the values from sdp
+        self.sheerka.om.get(self.CONCEPTS_BY_FIRST_KEYWORD_ENTRY, None)  # to init the cache with the values from sdp
         concepts_by_first_keyword = self.sheerka.om.current_cache_manager().copy(self.CONCEPTS_BY_FIRST_KEYWORD_ENTRY)
         res = self.resolve_concepts_by_first_keyword(context, concepts_by_first_keyword)
         self.sheerka.om.put(self.RESOLVED_CONCEPTS_BY_FIRST_KEYWORD_ENTRY, False, res.body)
@@ -353,6 +352,8 @@ class SheerkaConceptManager(BaseService):
         :param concept:
         :return:
         """
+        # TODO : resolve concept first
+
         sheerka = context.sheerka
         refs = self.sheerka.om.get(self.CONCEPTS_REFERENCES_ENTRY, concept.id)
         if refs is not NotFound:
@@ -361,6 +362,7 @@ class SheerkaConceptManager(BaseService):
 
         try:
             sheerka.om.remove_concept(concept)
+            sheerka.publish(context, EVENT_CONCEPT_DELETED, concept)
             return sheerka.ret(self.NAME, True, sheerka.new(BuiltinConcepts.SUCCESS))
         except ConceptNotFound as ex:
             return sheerka.ret(self.NAME, False, sheerka.err(ex))