1# Copyright 2008-2017 Free Software Foundation, Inc. 2# This file is part of GNU Radio 3# 4# GNU Radio Companion is free software; you can redistribute it and/or 5# modify it under the terms of the GNU General Public License 6# as published by the Free Software Foundation; either version 2 7# of the License, or (at your option) any later version. 8# 9# GNU Radio Companion is distributed in the hope that it will be useful, 10# but WITHOUT ANY WARRANTY; without even the implied warranty of 11# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12# GNU General Public License for more details. 13# 14# You should have received a copy of the GNU General Public License 15# along with this program; if not, write to the Free Software 16# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA 17 18from __future__ import absolute_import 19 20 21class TemplateArg(str): 22 """ 23 A cheetah template argument created from a param. 24 The str of this class evaluates to the param's to code method. 25 The use of this class as a dictionary (enum only) will reveal the enum opts. 26 The __call__ or () method can return the param evaluated to a raw python data type. 27 """ 28 29 def __new__(cls, param): 30 value = param.to_code() 31 instance = str.__new__(cls, value) 32 setattr(instance, '_param', param) 33 return instance 34 35 def __getitem__(self, item): 36 return str(self._param.get_opt(item)) if self._param.is_enum() else NotImplemented 37 38 def __getattr__(self, item): 39 if not self._param.is_enum(): 40 raise AttributeError() 41 try: 42 return str(self._param.get_opt(item)) 43 except KeyError: 44 raise AttributeError() 45 46 def __str__(self): 47 return str(self._param.to_code()) 48 49 def __call__(self): 50 return self._param.get_evaluated() 51