From 96c5984e6abf17ce0c0b2d53defb14b4ae665455 Mon Sep 17 00:00:00 2001
From: Evan Broder <broder@mit.edu>
Date: Mon, 14 Dec 2009 20:50:43 -0500
Subject: [PATCH] Subclass invirt.common.struct from dict, instead of rolling
 our own almost-dict thing.

svn path=/trunk/packages/invirt-base/; revision=2592
---
 python/invirt/common.py |   32 ++++++++++++++------------------
 1 file changed, 14 insertions(+), 18 deletions(-)

diff --git a/python/invirt/common.py b/python/invirt/common.py
index 603b7f3..e4f7c25 100644
--- a/python/invirt/common.py
+++ b/python/invirt/common.py
@@ -8,28 +8,24 @@ import subprocess
 class InvirtConfigError(AttributeError):
     pass
 
-class struct(object):
+class struct(dict):
     'A simple namespace object.'
     def __init__(self, d = {}, __prefix = None, **kwargs):
-        'd is the dictionary or the items-iterable to update my __dict__ with.'
-        dct = {}
-        dct.update(d)
-        dct.update(kwargs)
-        self.__dict__.update(dct)
-        self.__keys = set(dct)
+        super(struct, self).__init__(d)
         self.__prefix = __prefix
+        self.update(kwargs)
     def __getattr__(self, key):
-        # XX ideally these would point a frame higher on the stack.
-        prefix = self.__prefix
-        if prefix is not None:
-            raise InvirtConfigError('missing configuration variable %s%s'
-                                    % (prefix, key))
-        else:
-            raise AttributeError("anonymous struct has no member '%s'"
-                                 % (key,))
-    def __iter__(self):
-        for i in self.__keys:
-            yield i
+        try:
+            return self[key]
+        except KeyError:
+            # XX ideally these would point a frame higher on the stack.
+            prefix = self.__prefix
+            if prefix is not None:
+                raise InvirtConfigError('missing configuration variable %s%s'
+                                        % (prefix, key))
+            else:
+                raise AttributeError("anonymous struct has no member '%s'"
+                                     % (key,))
 
 def dicts2struct(x, prefix = None):
     """
-- 
1.7.9.5