Imported Upstream version 3.2.2
[debian/gnuradio] / grc / python / Generator.py
1 """
2 Copyright 2008, 2009 Free Software Foundation, Inc.
3 This file is part of GNU Radio
4
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.
9
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.
14
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
18 """
19
20 import os
21 import subprocess
22 from Cheetah.Template import Template
23 import expr_utils
24 from Constants import \
25         TOP_BLOCK_FILE_MODE, HIER_BLOCK_FILE_MODE, \
26         HIER_BLOCKS_LIB_DIR, PYEXEC, \
27         FLOW_GRAPH_TEMPLATE
28 import convert_hier
29 from .. gui import Messages
30
31 class Generator(object):
32
33         def __init__(self, flow_graph, file_path):
34                 """
35                 Initialize the generator object.
36                 Determine the file to generate.
37                 @param flow_graph the flow graph object
38                 @param file_path the path to write the file to
39                 """
40                 self._flow_graph = flow_graph
41                 self._generate_options = self._flow_graph.get_option('generate_options')
42                 if self._generate_options == 'hb':
43                         self._mode = HIER_BLOCK_FILE_MODE
44                         dirname = HIER_BLOCKS_LIB_DIR
45                 else:
46                         self._mode = TOP_BLOCK_FILE_MODE
47                         dirname = os.path.dirname(file_path)
48                 filename = self._flow_graph.get_option('id') + '.py'
49                 self._file_path = os.path.join(dirname, filename)
50
51         def get_file_path(self): return self._file_path
52
53         def write(self):
54                 #do throttle warning
55                 all_keys = ' '.join(map(lambda b: b.get_key(), self._flow_graph.get_enabled_blocks()))
56                 if ('usrp' not in all_keys) and ('audio' not in all_keys) and ('throttle' not in all_keys) and self._generate_options != 'hb':
57                         Messages.send_warning('''\
58 This flow graph may not have flow control: no audio or usrp blocks found. \
59 Add a Misc->Throttle block to your flow graph to avoid CPU congestion.''')
60                 #generate
61                 open(self.get_file_path(), 'w').write(str(self))
62                 if self._generate_options == 'hb':
63                         #convert hier block to xml wrapper
64                         convert_hier.convert_hier(self._flow_graph, self.get_file_path())
65                 os.chmod(self.get_file_path(), self._mode)
66
67         def get_popen(self):
68                 """
69                 Execute this python flow graph.
70                 @return a popen object
71                 """
72                 #execute
73                 cmds = [PYEXEC, '-u', self.get_file_path()] #-u is unbuffered stdio
74                 if self._generate_options == 'no_gui':
75                         cmds = ['xterm', '-e'] + cmds
76                 p = subprocess.Popen(args=cmds, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, shell=False, universal_newlines=True)
77                 return p
78
79         def __str__(self):
80                 """
81                 Convert the flow graph to python code.
82                 @return a string of python code
83                 """
84                 title = self._flow_graph.get_option('title') or self._flow_graph.get_option('id').replace('_', ' ').title()
85                 imports = self._flow_graph.get_imports()
86                 variables = self._flow_graph.get_variables()
87                 parameters = self._flow_graph.get_parameters()
88                 #list of variables with controls
89                 controls = filter(lambda v: v.get_make(), variables)
90                 #list of blocks not including variables and imports and parameters and disabled
91                 blocks = sorted(self._flow_graph.get_enabled_blocks(), lambda x, y: cmp(x.get_id(), y.get_id()))
92                 probes = filter(lambda b: b.get_key().startswith('probe_'), blocks) #ensure probes are last in the block list
93                 #get a list of notebooks and sort them according dependencies
94                 notebooks = expr_utils.sort_objects(
95                         filter(lambda b: b.get_key() == 'notebook', blocks),
96                         lambda n: n.get_id(), lambda n: n.get_param('notebook').get_value(),
97                 )
98                 #list of regular blocks (all blocks minus the special ones)
99                 blocks = filter(lambda b: b not in (imports + parameters + variables + probes + notebooks), blocks) + probes
100                 #list of connections where each endpoint is enabled
101                 connections = self._flow_graph.get_enabled_connections()
102                 #list of variable names
103                 var_ids = [var.get_id() for var in parameters + variables]
104                 #prepend self.
105                 replace_dict = dict([(var_id, 'self.%s'%var_id) for var_id in var_ids])
106                 #list of callbacks
107                 callbacks = [
108                         expr_utils.expr_replace(cb, replace_dict)
109                         for cb in sum([block.get_callbacks() for block in self._flow_graph.get_enabled_blocks()], [])
110                 ]
111                 #map var id to callbacks
112                 var_id2cbs = dict(
113                         [(var_id, filter(lambda c: expr_utils.get_variable_dependencies(c, [var_id]), callbacks))
114                         for var_id in var_ids]
115                 )
116                 #load the namespace
117                 namespace = {
118                         'title': title,
119                         'imports': imports,
120                         'flow_graph': self._flow_graph,
121                         'variables': variables,
122                         'notebooks': notebooks,
123                         'controls': controls,
124                         'parameters': parameters,
125                         'blocks': blocks,
126                         'connections': connections,
127                         'generate_options': self._generate_options,
128                         'var_id2cbs': var_id2cbs,
129                 }
130                 #build the template
131                 t = Template(open(FLOW_GRAPH_TEMPLATE, 'r').read(), namespace)
132                 return str(t)