Fixed some bugs

src/core/sheerka/Sheerka.py

@@ -32,7 +32,7 @@ class Sheerka(Concept):
     CONCEPTS_BY_NAME_ENTRY = "Concepts_By_Name"
     CONCEPTS_BY_HASH_ENTRY = "Concepts_By_Hash"  # store hash of concepts definitions (not values)
 
-    CONCEPTS_REFERENCES = "Concepts_References"  # tracks references between concepts
+    CONCEPTS_REFERENCES_ENTRY = "Concepts_References"  # tracks references between concepts
 
     CONCEPTS_BY_FIRST_KEYWORD_ENTRY = "Concepts_By_First_Keyword"
     RESOLVED_CONCEPTS_BY_FIRST_KEYWORD_ENTRY = "Resolved_Concepts_By_First_Keyword"
@@ -45,6 +45,8 @@ class Sheerka(Concept):
     BUILTIN_CONCEPTS_KEYS = "Builtins_Concepts"  # sequential key for builtin concepts
     USER_CONCEPTS_KEYS = "User_Concepts"  # sequential key for user defined concepts
 
+    MAX_EXECUTION_HISTORY = 100
+
     def __init__(self, cache_only=False, debug=False, loggers=None):
         self.init_logging(debug, loggers)
         self.loggers = loggers
@@ -91,6 +93,8 @@ class Sheerka(Concept):
 
         self.locals = {}
 
+        self.last_executions = []
+
     @property
     def resolved_concepts_by_first_keyword(self):
         """
@@ -218,8 +222,8 @@ class Sheerka(Concept):
         cache = ListIfNeededCache(**params(self.CONCEPTS_BY_HASH_ENTRY))
         register_concept_cache(self.CONCEPTS_BY_HASH_ENTRY, cache, lambda c: c.get_definition_hash(), True)
 
-        cache = SetCache(default=lambda k: self.sdp.get(self.CONCEPTS_REFERENCES, k))
-        self.cache_manager.register_cache(self.CONCEPTS_REFERENCES, cache)
+        cache = SetCache(default=lambda k: self.sdp.get(self.CONCEPTS_REFERENCES_ENTRY, k))
+        self.cache_manager.register_cache(self.CONCEPTS_REFERENCES_ENTRY, cache)
 
         cache = DictionaryCache(default=lambda k: self.sdp.get(self.CONCEPTS_BY_FIRST_KEYWORD_ENTRY, k))
         self.cache_manager.register_cache(self.CONCEPTS_BY_FIRST_KEYWORD_ENTRY, cache)
@@ -299,7 +303,7 @@ class Sheerka(Concept):
         Init the parsers
         :return:
         """
-        core.utils.init_package_import("parsers")
+        core.utils.import_module_and_sub_module("parsers")
         base_class = core.utils.get_class("parsers.BaseParser.BaseParser")
         modules_to_skip = ["parsers.BaseNodeParser"]
 
@@ -332,7 +336,7 @@ class Sheerka(Concept):
         Init the evaluators
         :return:
         """
-        core.utils.init_package_import("evaluators")
+        core.utils.import_module_and_sub_module("evaluators")
         for evaluator in core.utils.get_sub_classes("evaluators", "evaluators.BaseEvaluator.OneReturnValueEvaluator"):
             self.init_log.debug(f"Adding builtin evaluator '{evaluator.__name__}'")
             self.evaluators.append(evaluator)
@@ -412,6 +416,10 @@ class Sheerka(Concept):
         #             f.write(text + "\n")
 
         self._last_execution = execution_context
+        if len(self.last_executions) == self.MAX_EXECUTION_HISTORY:
+            del self.last_executions[0]
+        self.last_executions.append(execution_context)
+
         return ret
 
     def print(self, result, instructions=None):