1 files changed, 125 insertions, 0 deletions
diff --git a/grc/python/Generator.py b/grc/python/Generator.py
new file mode 100644
index 000000000..cde7dc3d4
--- /dev/null
+++ b/grc/python/Generator.py
@@ -0,0 +1,125 @@
+"""
+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 os
+import subprocess
+from Cheetah.Template import Template
+import expr_utils
+from Constants import \
+	TOP_BLOCK_FILE_MODE, HIER_BLOCK_FILE_MODE, \
+	HIER_BLOCKS_LIB_DIR, PYEXEC, \
+	FLOW_GRAPH_TEMPLATE
+import convert_hier
+from .. gui import Messages
+
+class Generator(object):
+
+	def __init__(self, flow_graph, file_path):
+		"""
+		Initialize the generator object.
+		Determine the file to generate.
+		@param flow_graph the flow graph object
+		@param file_path the path to write the file to
+		"""
+		self._flow_graph = flow_graph
+		self._generate_options = self._flow_graph.get_option('generate_options')
+		if self._generate_options == 'hb':
+			self._mode = HIER_BLOCK_FILE_MODE
+			dirname = HIER_BLOCKS_LIB_DIR
+		else:
+			self._mode = TOP_BLOCK_FILE_MODE
+			dirname = os.path.dirname(file_path)
+		filename = self._flow_graph.get_option('id') + '.py'
+		self._file_path = os.path.join(dirname, filename)
+
+	def get_file_path(self): return self._file_path
+
+	def write(self):
+		#do throttle warning
+		all_keys = ' '.join(map(lambda b: b.get_key(), self._flow_graph.get_enabled_blocks()))
+		if ('usrp' not in all_keys) and ('audio' not in all_keys) and ('throttle' not in all_keys) and self._generate_options != 'hb':
+			Messages.send_warning('''\
+This flow graph may not have flow control: no audio or usrp blocks found. \
+Add a Misc->Throttle block to your flow graph to avoid CPU congestion.''')
+		#generate
+		open(self.get_file_path(), 'w').write(str(self))
+		if self._generate_options == 'hb':
+			#convert hier block to xml wrapper
+			convert_hier.convert_hier(self._flow_graph, self.get_file_path())
+		os.chmod(self.get_file_path(), self._mode)
+
+	def get_popen(self):
+		"""
+		Execute this python flow graph.
+		@return a popen object
+		"""
+		#execute
+		cmds = [PYEXEC, '-u', self.get_file_path()] #-u is unbuffered stdio
+		if self._generate_options == 'no_gui':
+			cmds = ['xterm', '-e'] + cmds
+		p = subprocess.Popen(args=cmds, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, shell=False, universal_newlines=True)
+		return p
+
+	def __str__(self):
+		"""
+		Convert the flow graph to python code.
+		@return a string of python code
+		"""
+		title = self._flow_graph.get_option('title') or self._flow_graph.get_option('id').replace('_', ' ').title()
+		imports = self._flow_graph.get_imports()
+		variables = self._flow_graph.get_variables()
+		parameters = self._flow_graph.get_parameters()
+		#list of variables with controls
+		controls = filter(lambda v: v.get_make(), variables)
+		#list of blocks not including variables and imports and parameters and disabled
+		blocks = sorted(self._flow_graph.get_enabled_blocks(), lambda x, y: cmp(x.get_id(), y.get_id()))
+		probes = filter(lambda b: b.get_key().startswith('probe_'), blocks) #ensure probes are last in the block list
+		blocks = filter(lambda b: b not in (imports + parameters + variables + probes), blocks) + probes
+		#list of connections where each endpoint is enabled
+		connections = self._flow_graph.get_enabled_connections()
+		#list of variable names
+		var_ids = [var.get_id() for var in parameters + variables]
+		#prepend self.
+		replace_dict = dict([(var_id, 'self.%s'%var_id) for var_id in var_ids])
+		#list of callbacks
+		callbacks = [
+			expr_utils.expr_replace(cb, replace_dict)
+			for cb in sum([block.get_callbacks() for block in self._flow_graph.get_enabled_blocks()], [])
+		]
+		#map var id to callbacks
+		var_id2cbs = dict(
+			[(var_id, filter(lambda c: expr_utils.get_variable_dependencies(c, [var_id]), callbacks))
+			for var_id in var_ids]
+		)
+		#load the namespace
+		namespace = {
+			'title': title,
+			'imports': imports,
+			'flow_graph': self._flow_graph,
+			'variables': variables,
+			'controls': controls,
+			'parameters': parameters,
+			'blocks': blocks,
+			'connections': connections,
+			'generate_options': self._generate_options,
+			'var_id2cbs': var_id2cbs,
+		}
+		#build the template
+		t = Template(open(FLOW_GRAPH_TEMPLATE, 'r').read(), namespace)
+		return str(t)