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# Copyright 2017 Free Software Foundation, Inc.
# This file is part of GNU Radio
#
# SPDX-License-Identifier: GPL-2.0-or-later
#
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):
inst = etree.fromstring('<' + body + '/>')
if inst.tag == 'grc':
version_info.update(inst.attrib)
return element, version_info
load = load_lxml if HAVE_LXML else load_stdlib
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