[pypy-svn] r18375 - in pypy/dist/pypy/rpython/ootype: . test

[boria at codespeak.net]

Author: boria
Date: Tue Oct 11 11:06:16 2005
New Revision: 18375

Modified:
   pypy/dist/pypy/rpython/ootype/ootype.py
   pypy/dist/pypy/rpython/ootype/test/test_ootype.py
Log:
* Null values: checkpoint.


Modified: pypy/dist/pypy/rpython/ootype/ootype.py
==============================================================================
--- pypy/dist/pypy/rpython/ootype/ootype.py	(original)
+++ pypy/dist/pypy/rpython/ootype/ootype.py	Tue Oct 11 11:06:16 2005
@@ -169,9 +169,30 @@
 
         self.__dict__[name] = value
 
+class _null_instance(_instance):
+
+    def __init__(self, CLASS):
+        _instance.__init__(self, CLASS)
+
+    def __getattribute__(self, name):
+        if name.startswith("_"):
+            return object.__getattribute__(self, name)
+    
+        _instance.__getattr__(self, name)
+        
+        raise RuntimeError("Access to field in null object")
+
+    def __setattr__(self, name, value):
+        _instance.__setattr__(self, name, value)
+
+        raise RuntimeError("Assignment to field in null object")
+
 def new(CLASS):
     return _instance(CLASS)
 
+def null(CLASS):
+    return _null_instance(CLASS)
+
 def typeOf(val):
     try:
         return val._TYPE

Modified: pypy/dist/pypy/rpython/ootype/test/test_ootype.py
==============================================================================
--- pypy/dist/pypy/rpython/ootype/test/test_ootype.py	(original)
+++ pypy/dist/pypy/rpython/ootype/test/test_ootype.py	Tue Oct 11 11:06:16 2005
@@ -23,3 +23,11 @@
     assert c.a == 3
 
     py.test.raises(TypeError, "Class('test', None, {'a': (Signed, 3.0)})")
+
+def test_simple_null():
+    C = Class("test", None, {"a": Signed})
+
+    c = null(C)
+    assert typeOf(c) == C
+
+    py.test.raises(RuntimeError, "c.a")