[svn r37264] create the new development trunk

--HG--
branch : trunk

py/magic/assertion.py

@@ -0,0 +1,31 @@
+import __builtin__, sys
+import py
+from py.__.magic import exprinfo
+
+BuiltinAssertionError = __builtin__.AssertionError
+
+class AssertionError(BuiltinAssertionError):
+    def __init__(self, *args):
+        BuiltinAssertionError.__init__(self, *args)
+        if args: 
+            self.msg = str(args[0])
+        else: 
+            f = sys._getframe(1)
+            try:
+                source = py.code.Frame(f).statement
+                source = str(source.deindent()).strip()
+            except py.error.ENOENT:
+                source = None
+                # this can also occur during reinterpretation, when the
+                # co_filename is set to "<run>".
+            if source:
+                self.msg = exprinfo.interpret(source, f, should_fail=True)
+                if not self.args:
+                    self.args = (self.msg,)
+            else:
+                self.msg = None
+
+def invoke():
+    py.magic.patch(__builtin__, 'AssertionError', AssertionError)
+def revoke():
+    py.magic.revert(__builtin__, 'AssertionError')