lldb/examples/summaries/cocoa/attrib_fromdict.py

   1 """
   2 Objective-C runtime wrapper for use by LLDB Python formatters
   3
   4 Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   5 See https://llvm.org/LICENSE.txt for license information.
   6 SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   7 """
   8
   9
  10 class AttributesDictionary:
  11     def __init__(self, allow_reset=True):
  12         # need to do it this way to prevent endless recursion
  13         self.__dict__["_dictionary"] = {}
  14         self.__dict__["_allow_reset"] = allow_reset
  15
  16     def __getattr__(self, name):
  17         if not self._check_exists(name):
  18             return None
  19         value = self._dictionary[name]
  20         return value
  21
  22     def _set_impl(self, name, value):
  23         self._dictionary[name] = value
  24
  25     def _check_exists(self, name):
  26         return name in self._dictionary
  27
  28     def __setattr__(self, name, value):
  29         if self._allow_reset:
  30             self._set_impl(name, value)
  31         else:
  32             self.set_if_necessary(name, value)
  33
  34     def set_if_necessary(self, name, value):
  35         if not self._check_exists(name):
  36             self._set_impl(name, value)
  37             return True
  38         return False
  39
  40     def __len__(self):
  41         return len(self._dictionary)