"""
Copyright 2008-2011 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
"""
from . import odict
from Element import Element
from .. gui import Messages
class FlowGraph(Element):
def __init__(self, platform):
"""
Make a flow graph from the arguments.
Args:
platform: a platforms with blocks and contrcutors
Returns:
the flow graph object
"""
#initialize
Element.__init__(self, platform)
#inital blank import
self.import_data()
def _get_unique_id(self, base_id=''):
"""
Get a unique id starting with the base id.
Args:
base_id: the id starts with this and appends a count
Returns:
a unique id
"""
index = 0
while True:
id = '%s_%d'%(base_id, index)
index = index + 1
#make sure that the id is not used by another block
if not filter(lambda b: b.get_id() == id, self.get_blocks()): return id
def __str__(self): return 'FlowGraph - %s(%s)'%(self.get_option('title'), self.get_option('id'))
def rewrite(self):
def refactor_bus_structure():
for block in self.get_blocks():
for direc in ['source', 'sink']:
if direc == 'source':
get_p = block.get_sources;
get_p_gui = block.get_sources_gui;
bus_structure = block.form_bus_structure('source');
else:
get_p = block.get_sinks;
get_p_gui = block.get_sinks_gui
bus_structure = block.form_bus_structure('sink');
if 'bus' in map(lambda a: a.get_type(), get_p_gui()):
if len(get_p_gui()) > len(bus_structure):
times = range(len(bus_structure), len(get_p_gui()));
for i in times:
for connect in get_p_gui()[-1].get_connections():
block.get_parent().remove_element(connect);
get_p().remove(get_p_gui()[-1]);
elif len(get_p_gui()) < len(bus_structure):
n = {'name':'bus','type':'bus'};
if True in map(lambda a: isinstance(a.get_nports(), int), get_p()):
n['nports'] = str(1);
times = range(len(get_p_gui()), len(bus_structure));
for i in times:
n['key'] = str(len(get_p()));
n = odict(n);
port = block.get_parent().get_parent().Port(block=block, n=n, dir=direc);
get_p().append(port);
for child in self.get_children(): child.rewrite()
refactor_bus_structure();
def get_option(self, key):
"""
Get the option for a given key.
The option comes from the special options block.
Args:
key: the param key for the options block
Returns:
the value held by that param
"""
return self._options_block.get_param(key).get_evaluated()
def is_flow_graph(self): return True
##############################################
## Access Elements
##############################################
def get_block(self, id): return filter(lambda b: b.get_id() == id, self.get_blocks())[0]
def get_blocks_unordered(self): return filter(lambda e: e.is_block(), self.get_elements())
def get_blocks(self):
blocks = self.get_blocks_unordered();
for i in range(len(blocks)):
if blocks[i].get_key() == 'variable':
blk = blocks[i];
blocks.remove(blk);
blocks.insert(1, blk);
return blocks;
def get_connections(self): return filter(lambda e: e.is_connection(), self.get_elements())
def get_children(self): return self.get_elements()
def get_elements(self):
"""
Get a list of all the elements.
Always ensure that the options block is in the list (only once).
Returns:
the element list
"""
options_block_count = self._elements.count(self._options_block)
if not options_block_count:
self._elements.append(self._options_block)
for i in range(options_block_count-1):
self._elements.remove(self._options_block)
return self._elements
def get_enabled_blocks(self):
"""
Get a list of all blocks that are enabled.
Returns:
a list of blocks
"""
return filter(lambda b: b.get_enabled(), self.get_blocks())
def get_enabled_connections(self):
"""
Get a list of all connections that are enabled.
Returns:
a list of connections
"""
return filter(lambda c: c.get_enabled(), self.get_connections())
def get_new_block(self, key):
"""
Get a new block of the specified key.
Add the block to the list of elements.
Args:
key: the block key
Returns:
the new block or None if not found
"""
if key not in self.get_parent().get_block_keys(): return None
block = self.get_parent().get_new_block(self, key)
self.get_elements().append(block);
if block._bussify_sink:
block.bussify({'name':'bus','type':'bus'}, 'sink')
if block._bussify_source:
block.bussify({'name':'bus','type':'bus'}, 'source')
return block;
def connect(self, porta, portb):
"""
Create a connection between porta and portb.
Args:
porta: a port
portb: another port
@throw Exception bad connection
Returns:
the new connection
"""
connection = self.get_parent().Connection(flow_graph=self, porta=porta, portb=portb)
self.get_elements().append(connection)
return connection
def remove_element(self, element):
"""
Remove the element from the list of elements.
If the element is a port, remove the whole block.
If the element is a block, remove its connections.
If the element is a connection, just remove the connection.
"""
if element not in self.get_elements(): return
#found a port, set to parent signal block
if element.is_port():
element = element.get_parent()
#remove block, remove all involved connections
if element.is_block():
for port in element.get_ports():
map(self.remove_element, port.get_connections())
if element.is_connection():
if element.is_bus():
cons_list = []
for i in map(lambda a: a.get_connections(), element.get_source().get_associated_ports()):
cons_list.extend(i);
map(self.remove_element, cons_list);
self.get_elements().remove(element)
def evaluate(self, expr):
"""
Evaluate the expression.
Args:
expr: the string expression
@throw NotImplementedError
"""
raise NotImplementedError
##############################################
## Import/Export Methods
##############################################
def export_data(self):
"""
Export this flow graph to nested data.
Export all block and connection data.
Returns:
a nested data odict
"""
import time
n = odict()
n['timestamp'] = time.ctime()
n['block'] = [block.export_data() for block in self.get_blocks()]
n['connection'] = [connection.export_data() for connection in self.get_connections()]
return odict({'flow_graph': n})
def import_data(self, n=None):
"""
Import blocks and connections into this flow graph.
Clear this flowgraph of all previous blocks and connections.
Any blocks or connections in error will be ignored.
Args:
n: the nested data odict
"""
#remove previous elements
self._elements = list()
#use blank data if none provided
fg_n = n and n.find('flow_graph') or odict()
blocks_n = fg_n.findall('block')
connections_n = fg_n.findall('connection')
#create option block
self._options_block = self.get_parent().get_new_block(self, 'options')
#build the blocks
for block_n in blocks_n:
key = block_n.find('key')
block = self._options_block if key == 'options' else self.get_new_block(key)
if not block: # looks like this block key cannot be found
# create a dummy block instead
block = self.get_new_block('dummy_block')
# Ugly ugly ugly
_initialize_dummy_block(block, block_n)
Messages.send_error_load('Block key "%s" not found in %s' % (key, self.get_parent()))
block.import_data(block_n)
#build the connections
block_ids = map(lambda b: b.get_id(), self.get_blocks())
for connection_n in connections_n:
try: # to make the connection
#get the block ids
source_block_id = connection_n.find('source_block_id')
sink_block_id = connection_n.find('sink_block_id')
#get the port keys
source_key = connection_n.find('source_key')
sink_key = connection_n.find('sink_key')
#verify the blocks
if source_block_id not in block_ids:
raise LookupError('source block id "%s" not in block ids'%source_block_id)
if sink_block_id not in block_ids:
raise LookupError('sink block id "%s" not in block ids'%sink_block_id)
#get the blocks
source_block = self.get_block(source_block_id)
sink_block = self.get_block(sink_block_id)
# update numeric message ports keys
source_key = self.update_message_port_key(source_key, source_block.get_sources())
sink_key = self.update_message_port_key(sink_key, sink_block.get_sinks())
#verify the ports
if source_key not in source_block.get_source_keys():
# dummy blocks learn their ports here
if source_block.is_dummy_block():
_dummy_block_add_port(source_block, source_key, dir='source')
else:
raise LookupError('source key "%s" not in source block keys' % source_key)
if sink_key not in sink_block.get_sink_keys():
# dummy blocks learn their ports here
if sink_block.is_dummy_block():
_dummy_block_add_port(sink_block, sink_key, dir='sink')
else:
raise LookupError('sink key "%s" not in sink block keys' % sink_key)
#get the ports
source = source_block.get_source(source_key)
sink = sink_block.get_sink(sink_key)
#build the connection
self.connect(source, sink)
except LookupError, e: Messages.send_error_load(
'Connection between %s(%s) and %s(%s) could not be made.\n\t%s'%(
source_block_id, source_key, sink_block_id, sink_key, e
)
)
self.rewrite() #global rewrite
def update_message_port_key(self, key, ports):
"""Backward compatibility for message port keys
Message ports use their names as key (like in the 'connect' method).
Flowgraph files from former versions still have numeric keys stored for
message connections. These have to be replaced by the name of the
respective port. The correct message port is deduced from the integer
value of the key (assuming the order has not changed).
:param key: the port key to be updated
:param ports: list of candidate ports
:returns: the updated key or the original one
"""
if key.isdigit(): # don't bother current message port keys
try:
port = ports[int(key)] # get port (assuming liner indexed keys)
if port.get_type() == "message":
return port.get_key() # for message ports get updated key
except IndexError:
pass
return key # do nothing
def _initialize_dummy_block(block, block_n):
"""This is so ugly... dummy-fy a block
Modify block object to get the behaviour for a missing block
"""
block._key = block_n.find('key')
block.is_dummy_block = lambda: True
block.is_valid = lambda: False
block.get_enabled = lambda: False
for param_n in block_n.findall('param'):
if param_n['key'] not in block.get_param_keys():
new_param_n = odict({'key': param_n['key'], 'name': param_n['key'], 'type': 'string'})
block.get_params().append(block.get_parent().get_parent().Param(block=block, n=new_param_n))
def _dummy_block_add_port(block, key, dir):
"""This is so ugly... Add a port to a dummy-fied block"""
port_n = odict({'name': '?', 'key': key, 'type': ''})
port = block.get_parent().get_parent().Port(block=block, n=port_n, dir=dir)
if port.is_source():
block.get_sources().append(port)
else:
block.get_sinks().append(port)