From 800e3caabcd9c85b0b2ae9299217ea31d0309545 Mon Sep 17 00:00:00 2001
From: Antoine van Gelder <antoine@g7.org.za>
Date: Sun, 28 Oct 2007 09:45:28 +0000
Subject: Initial import

---
(limited to 'util/decorators.py')

diff --git a/util/decorators.py b/util/decorators.py
new file mode 100644
index 0000000..cd00afc
--- /dev/null
+++ b/util/decorators.py
@@ -0,0 +1,64 @@
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+#
+
+import sys
+
+
+# Courtesy of: http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/465427
+DecoratorWithArgs = \
+  lambda decorator: lambda *args, **kwargs: lambda func: decorator(func, *args, **kwargs)
+
+
+
+def Property(function):
+  '''Property Decorator
+     Adapted from: http://wiki.python.org/moin/PythonDecoratorLibrary
+
+     Example: 
+      
+        class Foo(object):
+          @Property
+          def my_property():
+            def get(self): return self.__my_property
+            def set(self, value): self.__my_property = value  # (optional)
+            def default(self): return 'some default value'    # (optional)
+  '''
+  
+  keys = 'set', 'del'
+  func_locals = {'doc':function.__doc__}
+  
+  def fgetter(obj, name, getter, fdef):
+    attr_name = '_' + obj.__class__.__name__ + '__' + name
+    if not hasattr(obj, attr_name):
+      setattr(obj, attr_name, fdef(obj))
+    return getter(obj)
+  
+  def introspect(frame, event, arg):
+    if event == 'return':
+      locals = frame.f_locals
+      func_locals.update(dict(('f' + k,locals.get(k)) for k in keys))
+      if locals.has_key('default'):
+        func_locals['fget'] = lambda obj : fgetter(obj, function.__name__, locals['get'], locals['default'])
+      else:
+        func_locals['fget'] = lambda obj : fgetter(obj, function.__name__, locals['get'], lambda x : None)
+      
+      sys.settrace(None)
+    return introspect
+  
+  sys.settrace(introspect)
+  function()
+  
+  return property(**func_locals)
+
--
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