Enable evaluating blocks '{' '}'

smnp/runtime/evaluators/block.py

@@ -1,11 +1,18 @@
-from smnp.runtime.evaluator import evaluate
-from smnp.runtime.tools import flatListNode
+from smnp.runtime.evaluator import evaluate, Evaluator
 
 
-def evaluateBlock(block, environment):
-    environment.scopes.append({})
-    for node in flatListNode(block):
-        evaluate(node, environment)
-    environment.scopes.pop(-1)
+class BlockEvaluator(Evaluator):
 
+    @classmethod
+    def evaluator(cls, node, environment):
+        for child in node.children:
+            evaluate(child, environment)
+
+#
+# def evaluateBlock(block, environment):
+#     environment.scopes.append({})
+#     for node in flatListNode(block):
+#         evaluate(node, environment)
+#     environment.scopes.pop(-1)
+#