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# Copyright 2016 Free Software Foundation, Inc.
# This file is part of GNU Radio
#
# GNU Radio Companion 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.
#
# GNU Radio Companion 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 Street, Fifth Floor, Boston, MA 02110-1301, USA
from __future__ import absolute_import
import six
class Evaluated(object):
def __init__(self, expected_type, default, name=None):
self.expected_type = expected_type
self.default = default
self.name = name or 'evaled_property_{}'.format(id(self))
self.eval_function = self.default_eval_func
@property
def name_raw(self):
return '_' + self.name
def default_eval_func(self, instance):
raw = getattr(instance, self.name_raw)
try:
value = instance.parent_block.evaluate(raw)
except Exception as error:
if raw:
instance.add_error_message("Failed to eval '{}': {}".format(raw, error))
return self.default
if not isinstance(value, self.expected_type):
instance.add_error_message("Can not cast evaluated value '{}' to type {}"
"".format(value, self.expected_type))
return self.default
# print(instance, self.name, raw, value)
return value
def __call__(self, func):
self.name = func.__name__
self.eval_function = func
return self
def __get__(self, instance, owner):
if instance is None:
return self
attribs = instance.__dict__
try:
value = attribs[self.name]
except KeyError:
value = attribs[self.name] = self.eval_function(instance)
return value
def __set__(self, instance, value):
attribs = instance.__dict__
value = value or self.default
if isinstance(value, six.string_types) and value.startswith('${') and value.endswith('}'):
attribs[self.name_raw] = value[2:-1].strip()
attribs.pop(self.name, None) # reset previous eval result
else:
attribs[self.name] = type(self.default)(value)
def __delete__(self, instance):
attribs = instance.__dict__
if self.name_raw in attribs:
attribs.pop(self.name, None)
class EvaluatedEnum(Evaluated):
def __init__(self, allowed_values, default=None, name=None):
if isinstance(allowed_values, six.string_types):
allowed_values = set(allowed_values.split())
self.allowed_values = allowed_values
default = default if default is not None else next(iter(self.allowed_values))
super(EvaluatedEnum, self).__init__(str, default, name)
def default_eval_func(self, instance):
value = super(EvaluatedEnum, self).default_eval_func(instance)
if value not in self.allowed_values:
instance.add_error_message("Value '{}' not in allowed values".format(value))
return self.default
return value
class EvaluatedPInt(Evaluated):
def __init__(self, name=None):
super(EvaluatedPInt, self).__init__(int, 1, name)
def default_eval_func(self, instance):
value = super(EvaluatedPInt, self).default_eval_func(instance)
if value < 1:
# todo: log
return self.default
return value
class EvaluatedFlag(Evaluated):
def __init__(self, name=None):
super(EvaluatedFlag, self).__init__((bool, int), False, name)
def setup_names(cls):
for name, attrib in cls.__dict__.items():
if isinstance(attrib, Evaluated):
attrib.name = name
return cls
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