Fixed #51 : Added unit tests

src/core/sheerka/services/SheerkaEvaluateRules.py

@@ -85,7 +85,7 @@ class SheerkaEvaluateRules(BaseService):
                     results.setdefault(LOW_PRIORITY_RULES, []).append(rule)
                     continue
 
-                res = self.evaluate_rule(sub_context, rule, bag)
+                res = self.evaluate_rule_old(sub_context, rule, bag)
                 ok = res.status and self.sheerka.is_success(self.sheerka.objvalue(res))
                 results.setdefault(ok, []).append(rule)
                 if ok and success_priority is None:
@@ -96,9 +96,9 @@ class SheerkaEvaluateRules(BaseService):
             sub_context.add_values(rules_result=results)
             return results
 
-    def evaluate_rule(self, context, rule, bag):
+    def evaluate_rule_old(self, context, rule, bag):
         """
-        Evaluate all the predicate
+        Evaluate the conditions
         :param context:
         :param rule:
         :param bag:
@@ -132,6 +132,47 @@ class SheerkaEvaluateRules(BaseService):
 
         return expect_one(context, results)
 
+    def evaluate_rule(self, context, rule, bag):
+        """
+        Evaluate the conditions
+        :param context:
+        :param rule:
+        :param bag:
+        :return:
+        """
+
+        bag_variables = set(bag.keys())
+
+        results = []
+        for compiled_condition in rule.compiled_conditions:
+
+            if compiled_condition.variables.intersection(bag_variables) != compiled_condition.variables:
+                continue
+
+            if compiled_condition.return_value is None:
+                # We only want to test the existence of a data
+                results.append(context.sheerka.ret(self.NAME, True, True))
+
+            else:
+
+                # do not forget to reset the 'is_evaluated' in the case of a concept
+                if compiled_condition.evaluator_type == ConceptEvaluator.NAME:
+                    compiled_condition.concept.get_metadata().is_evaluated = False
+
+                evaluator = self.evaluators_by_name[compiled_condition.evaluator]
+                res = evaluator.eval(context, compiled_condition.return_value)
+                if res.status and isinstance(res.body, bool) and res.body:
+                    # one successful value found. No need to look any further
+                    results = [res]
+                    break
+                else:
+                    results.append(res)
+
+        debugger = context.get_debugger(SheerkaEvaluateRules.NAME, "evaluate_rule", new_debug_id=False)
+        debugger.debug_rule(rule, results)
+
+        return expect_one(context, results)
+
     def remove_from_rete_memory(self, lst):
         if lst is None:
             return

src/core/sheerka/services/SheerkaRuleManager.py

@@ -628,6 +628,18 @@ class RuleCompiledPredicate:
     variables: Set[str] = None  # TODO: set of required variables
 
 
+@dataclass()
+class CompiledCondition:
+    """
+    The 'when' expression is parsed to have a ReturnValueConcept or a Concept that can then be evaluated
+    Depending on the evaluator, the 'predicate' attribute or the 'concept' attribute will be used
+    """
+    evaluator_type: Union[str, None]  # PythonEvaluator.NAME | ConceptEvaluator.NAME
+    return_value: Union[ReturnValueConcept, None]  # compiled source as ReturnValue
+    variables: Set[str]
+    concept: Union[Concept, None] = None  # compiled source as concept
+
+
 @dataclass
 class CompiledWhenResult:
     """
@@ -1298,4 +1310,18 @@ class ReteConditionExprVisitor(ExpressionVisitor):
 
 
 class PythonConditionExprVisitor(ExpressionVisitor):
-    pass
+    def __init__(self, context):
+        self.context = context
+        self.var_counter = 0
+        self.variables = set()
+
+    def get_conditions(self, expr_node):
+        self.var_counter = 0
+        self.variables.clear()
+
+        condition = self.visit(expr_node)
+        return [condition]
+
+    def visit_VariableNode(self, expr_node: VariableNode):
+        # no evaluator to call, simply check that the variable is in the bag
+        return CompiledCondition(None, None, {expr_node.name})