Refactored to allow ConceptEvaluator

evaluators/ConceptEvaluator.py

@@ -0,0 +1,35 @@
+from core.concept import Concept, ConceptParts
+from evaluators.BaseEvaluator import OneReturnValueEvaluator
+import logging
+
+log = logging.getLogger(__name__)
+
+
+class ConceptEvaluator(OneReturnValueEvaluator):
+    def __init__(self):
+        super().__init__("Concept Evaluator", 50)
+
+    def matches(self, context, return_value):
+        return return_value.status and \
+            return_value.who == "Parsers:ConceptParser" and \
+            isinstance(return_value.value, Concept)
+
+    def eval(self, context, return_value):
+        sheerka = context.sheerka
+        concept = return_value.value
+
+        # pre condition should already be validated by the parser.
+        # It's a mandatory condition for the concept before it can be recognized
+
+        if len(concept.codes) == 0:
+            sheerka.add_codes_to_concept(context, concept)
+
+        # TODO; check pre
+        # if pre is not true, return Concept with a false value
+
+        body = concept.codes[ConceptParts.BODY]
+        if body is None:
+            return None  # nothing to do
+
+        return sheerka.ret(self.name, True, body.value, parents=[return_value])
+