Refactored to allow ConceptEvaluator

evaluators/DuplicateConceptEvaluator.py

@@ -0,0 +1,41 @@
+from core.builtin_concepts import BuiltinConcepts
+from evaluators.BaseEvaluator import AllReturnValuesEvaluator
+from parsers.BaseParser import BaseParser
+
+
+class DuplicateConceptEvaluator(AllReturnValuesEvaluator):
+    """
+    Use to recognize when we tried to add the same concept twice
+    """
+
+    def __init__(self):
+        super().__init__("Duplicate Concept Evaluator", 10)
+        self.already_defined = None
+
+    def matches(self, context, return_values):
+        sheerka = context.sheerka
+        parsing = False
+        add_concept_in_error = False
+        only_parsers = True
+
+        for ret in return_values:
+            if sheerka.isinstance(ret.value, BuiltinConcepts.PARSING):
+                if ret.status:
+                    parsing = True
+            elif ret.who == "Evaluators:Add new Concept":
+                if not ret.status and ret.value.body.args[0] == "Duplicate object.":
+                    add_concept_in_error = True
+                    self.already_defined = ret.value.body.obj
+            else:
+                if not ret.who.startswith(BaseParser.PREFIX):
+                    only_parsers = False
+
+        return parsing and add_concept_in_error and only_parsers
+
+    def eval(self, context, return_values):
+        sheerka = context.sheerka
+        return sheerka.ret(
+            self.name,
+            False,
+            sheerka.new(BuiltinConcepts.CONCEPT_ALREADY_DEFINED, obj=self.already_defined),
+            parents=return_values)