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| 1 # Copyright (c) 2013 The Chromium Authors. All rights reserved. |
| 2 # Use of this source code is governed by a BSD-style license that can be |
| 3 # found in the LICENSE file. |
| 4 |
| 5 import email.utils |
| 6 |
| 7 |
| 8 def lazy_property(func): |
| 9 """A decorator for lazy properties.""" |
| 10 name = '__lazy_' + func.__name__ |
| 11 |
| 12 def get_property(self, *args, **kwargs): |
| 13 if not hasattr(self, name): |
| 14 setattr(self, name, func(self, *args, **kwargs)) |
| 15 return getattr(self, name) |
| 16 |
| 17 return property(get_property) |
| 18 |
| 19 |
| 20 class LazyDict(object): |
| 21 def __init__(self, lookup_fn): |
| 22 self.items = {} |
| 23 self.lookup = lookup_fn |
| 24 |
| 25 def __getitem__(self, name): |
| 26 if name not in self.items.keys(): |
| 27 self.items[name] = self.lookup(name) |
| 28 return self.items[name] |
| 29 |
| 30 |
| 31 class ObjectDict(object): |
| 32 def __init__(self, data): |
| 33 self.data = data |
| 34 |
| 35 def __getitem__(self, name): |
| 36 val = self.data[name] |
| 37 if type(val) == dict: |
| 38 return ObjectDict(val) |
| 39 return val |
| 40 |
| 41 def __getattr__(self, name): |
| 42 try: |
| 43 return self[name] |
| 44 except KeyError as e: |
| 45 raise AttributeError(e) |
| 46 |
| 47 def __iter__(self): |
| 48 return self.data.iterkeys() |
| 49 |
| 50 |
| 51 def get_emails(string): |
| 52 return [entry[1] for entry in email.utils.getaddresses([string])] |
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