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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 re
from os import path
try:
# raise ImportError()
from lxml import etree
HAVE_LXML = True
except ImportError:
import xml.etree.ElementTree as etree
HAVE_LXML = False
_validator_cache = {None: lambda xml: True}
def _get_validator(dtd=None):
validator = _validator_cache.get(dtd)
if not validator:
if not path.isabs(dtd):
dtd = path.join(path.dirname(__file__), dtd)
validator = _validator_cache[dtd] = etree.DTD(dtd).validate
return validator
def load_lxml(filename, document_type_def=None):
"""Load block description from xml file"""
try:
xml_tree = etree.parse(filename)
_get_validator(document_type_def)
element = xml_tree.getroot()
except etree.LxmlError:
raise ValueError("Failed to parse or validate {}".format(filename))
version_info = {}
for inst in xml_tree.xpath('/processing-instruction()'):
if inst.target == 'grc':
version_info.update(inst.attrib)
return element, version_info
def load_stdlib(filename, document_type_def=None):
"""Load block description from xml file"""
with open(filename, 'rb') as xml_file:
data = xml_file.read().decode('utf-8')
try:
element = etree.fromstring(data)
except etree.ParseError:
raise ValueError("Failed to parse {}".format(filename))
version_info = {}
for body in re.findall(r'<\?(.*?)\?>', data):
element = etree.fromstring('<' + body + '/>')
if element.tag == 'grc':
version_info.update(element.attrib)
return element, version_info
load = load_lxml if HAVE_LXML else load_stdlib
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