Refactored sheerka class: splitted to use sub handlers. Refactored unit tests to use classes.

src/evaluators/ConceptEvaluator.py

@@ -0,0 +1,53 @@
+from core.builtin_concepts import ParserResultConcept, BuiltinConcepts
+from core.concept import Concept, ConceptParts
+from evaluators.BaseEvaluator import OneReturnValueEvaluator
+
+
+class ConceptEvaluator(OneReturnValueEvaluator):
+    """
+    The concept evaluatuor is the main class that know what to do with a concept
+    It verifies the PRE
+    If ok, can execute or not the BODY
+    Then checks the POST conditions
+    """
+    NAME = "Concept"
+
+    def __init__(self, return_body=False):
+        super().__init__(self.NAME, [BuiltinConcepts.EVALUATION], 50)
+        self.return_body = return_body
+
+    def matches(self, context, return_value):
+        return return_value.status and \
+               isinstance(return_value.value, ParserResultConcept) and \
+               isinstance(return_value.value.value, Concept)
+
+    def eval(self, context, return_value):
+        sheerka = context.sheerka
+        concept = return_value.value.value
+        context.log(self.verbose_log, f"Evaluating concept {concept}.", self.name)
+
+        # If the concept that is requested is in the context(at least its name), drop the call.
+        # Why ?
+        # If we evaluate Concept("foo", body="a").set_prop("a", "'property_a'")
+        # The body should be 'property_a', and not a concept called 'a'
+        if context.obj and concept.name in context.obj.props:
+            value = context.obj.props[concept.name].value
+            context.log(self.verbose_log, f"{concept.name} is a property. Returning value '{value}'.", self.name)
+
+            return sheerka.ret(self.name, True, value, parents=[return_value])
+
+        evaluated = sheerka.evaluate_concept(context, concept, self.verbose_log)
+
+        if evaluated.key != concept.key:
+            # evaluated.key != concept.key means that we have transformed the concept
+            # When you successfully evaluate an error, the status should not be false
+            return sheerka.ret(
+                self.name,
+                False,
+                evaluated,
+                parents=[return_value])
+
+        if not self.return_body or ConceptParts.BODY not in evaluated.compiled:
+            return sheerka.ret(self.name, True, evaluated, parents=[return_value])
+        else:
+            return sheerka.ret(self.name, True, evaluated.body, parents=[return_value])