🐐 NON operator

centvrion/ast_nodes.py

@@ -462,6 +462,24 @@ class UnaryMinus(Node):
     return vtable, ValInt(-val.value())
 
 
+class UnaryNot(Node):
+  def __init__(self, expr):
+    self.expr = expr
+
+  def __eq__(self, other):
+    return type(self) == type(other) and self.expr == other.expr
+
+  def __repr__(self):
+    return f"UnaryNot({self.expr!r})"
+
+  def print(self):
+    return f"(NON {self.expr.print()})"
+
+  def _eval(self, vtable):
+    vtable, val = self.expr.eval(vtable)
+    return vtable, ValBool(not bool(val))
+
+
 class ArrayIndex(Node):
   def __init__(self, array, index) -> None:
     self.array = array