From 90dad2ec57b9110b1e2ec6f46539edf41cfe2e99 Mon Sep 17 00:00:00 2001
From: Marion <marion.zepf@gmail.com>
Date: Thu, 05 Sep 2013 21:15:59 +0000
Subject: simplify and fix export of 'while' and 'until' loops

---
(limited to 'TurtleArt/tatype.py')

diff --git a/TurtleArt/tatype.py b/TurtleArt/tatype.py
index add26e3..cf75e44 100644
--- a/TurtleArt/tatype.py
+++ b/TurtleArt/tatype.py
@@ -49,11 +49,8 @@ class Type(object):
 
 class TypeDisjunction(tuple,Type):
     """ Disjunction of two or more Types (from the type hierarchy) """
-
     def __init__(self, iterable):
         self = tuple(iterable)
-
-
     def __str__(self):
         s = ["("]
         for disj in self:
@@ -129,6 +126,9 @@ def get_type(x):
                 return (TYPE_INT, True)
             elif x.func.id in ('repr', 'str', 'unicode'):
                 return (TYPE_STRING, True)
+    # unary operands never change the type of their argument
+    elif isinstance(x, ast.UnaryOp):
+        return get_type(x.operand)
 
     return (TYPE_OBJECT, isinstance(x, ast.AST))
 
@@ -337,27 +337,7 @@ class TypedCall(ast.Call):
     @property
     def return_type(self):
         if self._return_type is None:
-            return get_type(self.func)
-        else:
-            return self._return_type
-
-
-class TypedLambda(ast.Lambda):
-    """ Like a Lambda AST, but with a return type """
-
-    def __init__(self, body=None, args=None, return_type=None):
-
-        if args is None:
-            args = ast.arguments(args=[], vararg=None, kwarg=None, defaults=[])
-
-        ast.Lambda.__init__(self, body=body, args=args)
-
-        self._return_type = return_type
-
-    @property
-    def return_type(self):
-        if self._return_type is None:
-            return get_type(self.func)
+            return get_type(self.func)[0]
         else:
             return self._return_type
 
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