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

src/evaluators/PrepareEvalEvaluator.py

@@ -0,0 +1,40 @@
+from core.builtin_concepts import BuiltinConcepts
+from evaluators.BaseEvaluator import OneReturnValueEvaluator
+
+
+class PrepareEvalEvaluator(OneReturnValueEvaluator):
+    """
+    To parse evaluation requests
+    """
+
+    NAME = "PrepareEval"
+
+    def __init__(self, **kwargs):
+        super().__init__(self.NAME, [BuiltinConcepts.BEFORE_PARSING], 90)
+        self.text = None
+
+    def matches(self, context, return_value):
+        if not (return_value.status and
+                context.sheerka.isinstance(return_value.body, BuiltinConcepts.USER_INPUT) and
+                isinstance(return_value.body.body, str)):
+            return False
+
+        text = return_value.body.body.strip()
+        if not text.startswith("eval "):
+            return False
+
+        self.text = text
+        return True
+
+    def eval(self, context, return_value):
+        sheerka = context.sheerka
+
+        new_text_to_parse = sheerka.ret(
+            self.name,
+            True, sheerka.new(BuiltinConcepts.USER_INPUT, body=self.text[5:], user_name=context.event.user))
+
+        evaluation_requested = sheerka.ret(
+            self.name,
+            True, sheerka.new(BuiltinConcepts.CONCEPT_EVAL_REQUESTED))
+
+        return [new_text_to_parse, evaluation_requested]