Create evaluator for product (both multiplying and dividing)

smnp/runtime/evaluators/product.py

@@ -0,0 +1,31 @@
+from smnp.error.runtime import RuntimeException
+from smnp.runtime.evaluator import Evaluator
+from smnp.runtime.evaluators.expression import expressionEvaluator
+from smnp.type.model import Type
+
+
+class ProductEvaluator(Evaluator):
+
+    @classmethod
+    def evaluator(cls, node, environment):
+        left = expressionEvaluator(doAssert=True)(node.left, environment).value
+        right = expressionEvaluator(doAssert=True)(node.right, environment).value
+
+        if left.type != Type.INTEGER:
+            raise RuntimeException(
+                f"Operator '{node.operator.value}' is supported only by {Type.INTEGER.name.lower()} type", node.left.pos)
+
+        if right.type != Type.INTEGER:
+            raise RuntimeException(
+                f"Operator '{node.operator.value}' is supported only by {Type.INTEGER.name.lower()} type", node.right.pos)
+
+        if node.operator.value == "*":
+            return Type.integer(int(left.value * right.value))
+
+        if node.operator.value == "/":
+            if right.value == 0:
+                raise RuntimeException("Attempt to divide by 0", node.right.pos)
+            return Type.integer(int(left.value / right.value))
+
+        raise RuntimeError("This line should never be reached")
+