Added basic implementation for Python code evaluation

evaluators/AddConceptEvaluator.py

@@ -0,0 +1,23 @@
+from evaluators.BaseEvaluator import BaseEvaluator
+from parsers.DefaultParser import DefConceptNode
+import logging
+
+log = logging.getLogger(__name__)
+
+
+class AddConceptEvaluator(BaseEvaluator):
+    """
+    Used to add a new concept
+    """
+
+    def __init__(self):
+        super().__init__("Add new Concept", 50)
+
+    def matches(self, context, items):
+        return len(items) == 1 and items[0].status and isinstance(items[0].value, DefConceptNode)
+
+    def eval(self, context, items):
+        log.debug("Adding a new concept")
+        node = items[0].value
+        sheerka = context.sheerka
+        return sheerka.add_concept(context, node)