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"""
Copyright 2008 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 lxml import etree
from . import odict
xml_failures = {}
class XMLSyntaxError(Exception):
def __init__(self, error_log):
self._error_log = error_log
xml_failures[error_log.last_error.filename] = error_log
def __str__(self):
return '\n'.join(map(str, self._error_log.filter_from_errors()))
def validate_dtd(xml_file, dtd_file=None):
"""
Validate an xml file against its dtd.
Args:
xml_file: the xml file
dtd_file: the optional dtd file
@throws Exception validation fails
"""
# perform parsing, use dtd validation if dtd file is not specified
parser = etree.XMLParser(dtd_validation=not dtd_file)
try:
xml = etree.parse(xml_file, parser=parser)
except etree.LxmlError:
pass
if parser.error_log:
raise XMLSyntaxError(parser.error_log)
# perform dtd validation if the dtd file is specified
if not dtd_file:
return
try:
dtd = etree.DTD(dtd_file)
if not dtd.validate(xml.getroot()):
raise XMLSyntaxError(dtd.error_log)
except etree.LxmlError:
raise XMLSyntaxError(dtd.error_log)
def from_file(xml_file):
"""
Create nested data from an xml file using the from xml helper.
Also get the grc version information.
Args:
xml_file: the xml file path
Returns:
the nested data with grc version information
"""
xml = etree.parse(xml_file)
nested_data = _from_file(xml.getroot())
# Get the embedded instructions and build a dictionary item
nested_data['_instructions'] = {}
xml_instructions = xml.xpath('/processing-instruction()')
for inst in filter(lambda i: i.target == 'grc', xml_instructions):
nested_data['_instructions'] = odict(inst.attrib)
return nested_data
def _from_file(xml):
"""
Recursively parse the xml tree into nested data format.
Args:
xml: the xml tree
Returns:
the nested data
"""
tag = xml.tag
if not len(xml):
return odict({tag: xml.text or ''}) # store empty tags (text is None) as empty string
nested_data = odict()
for elem in xml:
key, value = _from_file(elem).items()[0]
if nested_data.has_key(key): nested_data[key].append(value)
else: nested_data[key] = [value]
# delistify if the length of values is 1
for key, values in nested_data.iteritems():
if len(values) == 1:
nested_data[key] = values[0]
return odict({tag: nested_data})
def to_file(nested_data, xml_file):
"""
Write to an xml file and insert processing instructions for versioning
Args:
nested_data: the nested data
xml_file: the xml file path
"""
xml_data = ""
instructions = nested_data.pop('_instructions', None)
if instructions: # create the processing instruction from the array
xml_data += etree.tostring(etree.ProcessingInstruction(
'grc', ' '.join(
"{0}='{1}'".format(*item) for item in instructions.iteritems())
), xml_declaration=True, pretty_print=True, encoding='utf-8')
xml_data += etree.tostring(_to_file(nested_data)[0],
pretty_print=True, encoding='utf-8')
with open(xml_file, 'w') as fp:
fp.write(xml_data)
def _to_file(nested_data):
"""
Recursively parse the nested data into xml tree format.
Args:
nested_data: the nested data
Returns:
the xml tree filled with child nodes
"""
nodes = list()
for key, values in nested_data.iteritems():
# listify the values if not a list
if not isinstance(values, (list, set, tuple)):
values = [values]
for value in values:
node = etree.Element(key)
if isinstance(value, (str, unicode)):
node.text = unicode(value)
else:
node.extend(_to_file(value))
nodes.append(node)
return nodes
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