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# Copyright 2017 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 __future__ import absolute_import, division
import ast
from collections import OrderedDict
from ..core.io import yaml
from . import xml
def from_xml(filename):
"""Load flow graph from xml file"""
element, version_info = xml.load(filename, 'flow_graph.dtd')
data = convert_flow_graph_xml(element)
try:
file_format = int(version_info['format'])
except KeyError:
file_format = _guess_file_format_1(data)
data['metadata'] = {'file_format': file_format}
return data
def dump(data, stream):
out = yaml.dump(data, indent=2)
replace = [
('blocks:', '\nblocks:'),
('connections:', '\nconnections:'),
('metadata:', '\nmetadata:'),
]
for r in replace:
out = out.replace(*r)
prefix = '# auto-generated by grc.converter\n\n'
stream.write(prefix + out)
def convert_flow_graph_xml(node):
blocks = [
convert_block(block_data)
for block_data in node.findall('block')
]
options = next(b for b in blocks if b['id'] == 'options')
blocks.remove(options)
options.pop('id')
connections = [
convert_connection(connection)
for connection in node.findall('connection')
]
flow_graph = OrderedDict()
flow_graph['options'] = options
flow_graph['blocks'] = blocks
flow_graph['connections'] = connections
return flow_graph
def convert_block(data):
block_id = data.findtext('key')
params = OrderedDict(sorted(
(param.findtext('key'), param.findtext('value'))
for param in data.findall('param')
))
states = OrderedDict()
x, y = ast.literal_eval(params.pop('_coordinate', '(10, 10)'))
states['coordinate'] = yaml.ListFlowing([x, y])
states['rotation'] = int(params.pop('_rotation', '0'))
enabled = params.pop('_enabled', 'True')
states['state'] = (
'enabled' if enabled in ('1', 'True') else
'bypassed' if enabled == '2' else
'disabled'
)
block = OrderedDict()
if block_id != 'options':
block['name'] = params.pop('id')
block['id'] = block_id
block['parameters'] = params
block['states'] = states
return block
def convert_connection(data):
src_blk_id = data.findtext('source_block_id')
src_port_id = data.findtext('source_key')
snk_blk_id = data.findtext('sink_block_id')
snk_port_id = data.findtext('sink_key')
if src_port_id.isdigit():
src_port_id = 'out' + src_port_id
if snk_port_id.isdigit():
snk_port_id = 'in' + snk_port_id
return yaml.ListFlowing([src_blk_id, src_port_id, snk_blk_id, snk_port_id])
def _guess_file_format_1(data):
"""Try to guess the file format for flow-graph files without version tag"""
def has_numeric_port_ids(src_id, src_port_id, snk_id, snk_port_id):
return src_port_id.isdigit() and snk_port_id.is_digit()
try:
if any(not has_numeric_port_ids(*con) for con in data['connections']):
return 1
except:
pass
return 0
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