2 Copyright 2008, 2009 Free Software Foundation, Inc.
3 This file is part of GNU Radio
5 GNU Radio Companion is free software; you can redistribute it and/or
6 modify it under the terms of the GNU General Public License
7 as published by the Free Software Foundation; either version 2
8 of the License, or (at your option) any later version.
10 GNU Radio Companion is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
21 from .. base.FlowGraph import FlowGraph as _FlowGraph
22 from .. gui.FlowGraph import FlowGraph as _GUIFlowGraph
25 _variable_matcher = re.compile('^(variable\w*)$')
26 _parameter_matcher = re.compile('^(parameter)$')
28 class FlowGraph(_FlowGraph, _GUIFlowGraph):
30 def __init__(self, **kwargs):
31 _FlowGraph.__init__(self, **kwargs)
32 _GUIFlowGraph.__init__(self)
33 self._eval_cache = dict()
35 def _eval(self, code, namespace, namespace_hash):
37 Evaluate the code with the given namespace.
38 @param code a string with python code
39 @param namespace a dict representing the namespace
40 @param namespace_hash a unique hash for the namespace
41 @return the resultant object
43 if not code: raise Exception, 'Cannot evaluate empty statement.'
44 my_hash = hash(code) ^ namespace_hash
45 #cache if does not exist
46 if not self._eval_cache.has_key(my_hash):
47 self._eval_cache[my_hash] = eval(code, namespace, namespace)
49 return self._eval_cache[my_hash]
51 def _get_io_signature(self, pad_key):
53 Get an io signature for this flow graph.
54 The pad key determines the directionality of the io signature.
55 @param pad_key a string of pad_source or pad_sink
56 @return a dict with: type, nports, vlen, size
58 pads = filter(lambda b: b.get_key() == pad_key, self.get_enabled_blocks())
65 pad = pads[0] #take only the first, user should not have more than 1
68 'nports': str(pad.get_param('nports').get_evaluated()),
69 'type': str(pad.get_param('type').get_evaluated()),
70 'vlen': str(pad.get_param('vlen').get_evaluated()),
71 'size': pad.get_param('type').get_opt('size'),
74 def get_input_signature(self):
76 Get the io signature for the input side of this flow graph.
77 The io signature with be "0", "0" if no pad source is present.
78 @return a string tuple of type, num_ports, port_size
80 return self._get_io_signature('pad_source')
82 def get_output_signature(self):
84 Get the io signature for the output side of this flow graph.
85 The io signature with be "0", "0" if no pad sink is present.
86 @return a string tuple of type, num_ports, port_size
88 return self._get_io_signature('pad_sink')
90 def get_imports(self):
92 Get a set of all import statments in this flow graph namespace.
93 @return a set of import statements
95 imports = sum([block.get_imports() for block in self.get_enabled_blocks()], [])
96 imports = sorted(set(imports))
99 def get_variables(self):
101 Get a list of all variables in this flow graph namespace.
102 Exclude paramterized variables.
103 @return a sorted list of variable blocks in order of dependency (indep -> dep)
105 variables = filter(lambda b: _variable_matcher.match(b.get_key()), self.get_enabled_blocks())
106 return expr_utils.sort_objects(variables, lambda v: v.get_id(), lambda v: v.get_var_make())
108 def get_parameters(self):
110 Get a list of all paramterized variables in this flow graph namespace.
111 @return a list of paramterized variables
113 parameters = filter(lambda b: _parameter_matcher.match(b.get_key()), self.get_enabled_blocks())
118 Flag the namespace to be renewed.
120 self._renew_eval_ns = True
121 _FlowGraph.rewrite(self)
123 def evaluate(self, expr):
125 Evaluate the expression.
126 @param expr the string expression
127 @throw Exception bad expression
128 @return the evaluated data
130 if self._renew_eval_ns:
131 self._renew_eval_ns = False
135 for imp in self.get_imports():
140 for parameter in self.get_parameters():
142 e = eval(parameter.get_param('value').to_code(), n, n)
143 np[parameter.get_id()] = e
145 n.update(np) #merge param namespace
147 for variable in self.get_variables():
149 e = eval(variable.get_param('value').to_code(), n, n)
150 n[variable.get_id()] = e
152 #make namespace public
154 self.n_hash = hash(str(n))
156 e = self._eval(expr, self.n, self.n_hash)