1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
|
"""
Copyright 2008, 2009 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
"""
import expr_utils
from .. base.FlowGraph import FlowGraph as _FlowGraph
from .. gui.FlowGraph import FlowGraph as _GUIFlowGraph
import re
_variable_matcher = re.compile('^(variable\w*)$')
_parameter_matcher = re.compile('^(parameter)$')
class FlowGraph(_FlowGraph, _GUIFlowGraph):
def __init__(self, **kwargs):
_FlowGraph.__init__(self, **kwargs)
_GUIFlowGraph.__init__(self)
self._eval_cache = dict()
def _eval(self, code, namespace, namespace_hash):
"""
Evaluate the code with the given namespace.
@param code a string with python code
@param namespace a dict representing the namespace
@param namespace_hash a unique hash for the namespace
@return the resultant object
"""
if not code: raise Exception, 'Cannot evaluate empty statement.'
my_hash = hash(code) ^ namespace_hash
#cache if does not exist
if not self._eval_cache.has_key(my_hash):
self._eval_cache[my_hash] = eval(code, namespace, namespace)
#return from cache
return self._eval_cache[my_hash]
def _get_io_signaturev(self, pad_key):
"""
Get a list of io signatures for this flow graph.
The pad key determines the directionality of the io signature.
@param pad_key a string of pad_source or pad_sink
@return a list of dicts with: type, label, vlen, size
"""
pads = filter(lambda b: b.get_key() == pad_key, self.get_enabled_blocks())
sorted_pads = sorted(pads, lambda x, y: cmp(x.get_id(), y.get_id()))
#load io signature
return [{
'label': str(pad.get_param('label').get_evaluated()),
'type': str(pad.get_param('type').get_evaluated()),
'vlen': str(pad.get_param('vlen').get_evaluated()),
'size': pad.get_param('type').get_opt('size'),
} for pad in sorted_pads]
def get_input_signaturev(self):
"""
Get the io signature for the input side of this flow graph.
@return a list of io signature structures
"""
return self._get_io_signaturev('pad_source')
def get_output_signaturev(self):
"""
Get the io signature for the output side of this flow graph.
@return a list of io signature structures
"""
return self._get_io_signaturev('pad_sink')
def get_imports(self):
"""
Get a set of all import statments in this flow graph namespace.
@return a set of import statements
"""
imports = sum([block.get_imports() for block in self.get_enabled_blocks()], [])
imports = sorted(set(imports))
return imports
def get_variables(self):
"""
Get a list of all variables in this flow graph namespace.
Exclude paramterized variables.
@return a sorted list of variable blocks in order of dependency (indep -> dep)
"""
variables = filter(lambda b: _variable_matcher.match(b.get_key()), self.get_enabled_blocks())
return expr_utils.sort_objects(variables, lambda v: v.get_id(), lambda v: v.get_var_make())
def get_parameters(self):
"""
Get a list of all paramterized variables in this flow graph namespace.
@return a list of paramterized variables
"""
parameters = filter(lambda b: _parameter_matcher.match(b.get_key()), self.get_enabled_blocks())
return parameters
def rewrite(self):
"""
Flag the namespace to be renewed.
"""
self._renew_eval_ns = True
_FlowGraph.rewrite(self)
def evaluate(self, expr):
"""
Evaluate the expression.
@param expr the string expression
@throw Exception bad expression
@return the evaluated data
"""
if self._renew_eval_ns:
self._renew_eval_ns = False
#reload namespace
n = dict()
#load imports
for imp in self.get_imports():
try: exec imp in n
except: pass
#load parameters
np = dict()
for parameter in self.get_parameters():
try:
e = eval(parameter.get_param('value').to_code(), n, n)
np[parameter.get_id()] = e
except: pass
n.update(np) #merge param namespace
#load variables
for variable in self.get_variables():
try:
e = eval(variable.get_param('value').to_code(), n, n)
n[variable.get_id()] = e
except: pass
#make namespace public
self.n = n
self.n_hash = hash(str(n))
#evaluate
e = self._eval(expr, self.n, self.n_hash)
return e
|
