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 Block import Block
23 from Connection import Connection
26 _variable_matcher = re.compile('^(variable\w*)$')
27 _parameter_matcher = re.compile('^(parameter)$')
29 class FlowGraph(_FlowGraph):
32 def _eval(self, code, namespace, namespace_hash):
34 Evaluate the code with the given namespace.
35 @param code a string with python code
36 @param namespace a dict representing the namespace
37 @param namespace_hash a unique hash for the namespace
38 @return the resultant object
40 my_hash = hash(code) ^ namespace_hash
41 #cache if does not exist
42 if not self._eval_cache.has_key(my_hash):
43 self._eval_cache[my_hash] = eval(code, namespace, namespace)
45 return self._eval_cache[my_hash]
47 def _get_io_signature(self, pad_key):
49 Get an io signature for this flow graph.
50 The pad key determines the directionality of the io signature.
51 @param pad_key a string of pad_source or pad_sink
52 @return a dict with: type, nports, vlen, size
54 pads = filter(lambda b: b.get_key() == pad_key, self.get_enabled_blocks())
61 pad = pads[0] #take only the first, user should not have more than 1
64 'nports': str(pad.get_param('nports').get_evaluated()),
65 'type': str(pad.get_param('type').get_evaluated()),
66 'vlen': str(pad.get_param('vlen').get_evaluated()),
67 'size': pad.get_param('type').get_opt('size'),
70 def get_input_signature(self):
72 Get the io signature for the input side of this flow graph.
73 The io signature with be "0", "0" if no pad source is present.
74 @return a string tuple of type, num_ports, port_size
76 return self._get_io_signature('pad_source')
78 def get_output_signature(self):
80 Get the io signature for the output side of this flow graph.
81 The io signature with be "0", "0" if no pad sink is present.
82 @return a string tuple of type, num_ports, port_size
84 return self._get_io_signature('pad_sink')
86 def get_imports(self):
88 Get a set of all import statments in this flow graph namespace.
89 @return a set of import statements
91 imports = sum([block.get_imports() for block in self.get_enabled_blocks()], [])
92 imports = sorted(set(imports))
95 def get_variables(self):
97 Get a list of all variables in this flow graph namespace.
98 Exclude paramterized variables.
99 @return a sorted list of variable blocks in order of dependency (indep -> dep)
101 variables = filter(lambda b: _variable_matcher.match(b.get_key()), self.get_enabled_blocks())
102 return expr_utils.sort_objects(variables, lambda v: v.get_id(), lambda v: v.get_var_make())
104 def get_parameters(self):
106 Get a list of all paramterized variables in this flow graph namespace.
107 @return a list of paramterized variables
109 parameters = filter(lambda b: _parameter_matcher.match(b.get_key()), self.get_enabled_blocks())
112 def evaluate(self, expr):
114 Evaluate the expression.
115 @param expr the string expression
116 @throw Exception bad expression
117 @return the evaluated data
119 if self.is_flagged():
124 for imp in self.get_imports():
129 for parameter in self.get_parameters():
131 e = eval(parameter.get_param('value').to_code(), n, n)
132 np[parameter.get_id()] = e
134 n.update(np) #merge param namespace
136 for variable in self.get_variables():
138 e = eval(variable.get_param('value').to_code(), n, n)
139 n[variable.get_id()] = e
141 #make namespace public
143 self.n_hash = hash(str(n))
145 e = self._eval(expr, self.n, self.n_hash)