1 files changed, 100 insertions, 0 deletions
diff --git a/grc/src/utils/ParseXML.py b/grc/src/utils/ParseXML.py
new file mode 100644
index 000000000..71f8c5279
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+++ b/grc/src/utils/ParseXML.py
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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 .. utils import odict
+
+XMLSyntaxError = etree.XMLSyntaxError
+
+def validate_dtd(xml_file, dtd_file=None):
+	"""
+	Validate an xml file against its dtd.
+	@param xml_file the xml file
+	@param dtd_file the optional dtd file
+	@throws Exception validation fails
+	"""
+	if dtd_file:
+		dtd = etree.DTD(dtd_file)
+		xml = etree.parse(xml_file)
+		if not dtd.validate(xml.getroot()):
+			raise XMLSyntaxError, '\n'.join(map(str, dtd.error_log.filter_from_errors()))
+	else:
+		parser = etree.XMLParser(dtd_validation=True)
+		xml = etree.parse(xml_file, parser=parser)
+		if parser.error_log:
+			raise XMLSyntaxError, '\n'.join(map(str, parser.error_log.filter_from_errors()))
+
+def from_file(xml_file):
+	"""
+	Create nested data from an xml file using the from xml helper.
+	@param xml_file the xml file path
+	@return the nested data
+	"""
+	xml = etree.parse(xml_file).getroot()
+	return _from_file(xml)
+
+def _from_file(xml):
+	"""
+	Recursivly parse the xml tree into nested data format.
+	@param xml the xml tree
+	@return 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 an xml file and use the to xml helper method to load it.
+	@param nested_data the nested data
+	@param xml_file the xml file path
+	"""
+	xml = _to_file(nested_data)[0]
+	open(xml_file, 'w').write(etree.tostring(xml, xml_declaration=True, pretty_print=True))
+
+def _to_file(nested_data):
+	"""
+	Recursivly parse the nested data into xml tree format.
+	@param nested_data the nested data
+	@return 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 = value
+			else: node.extend(_to_file(value))
+			nodes.append(node)
+	return nodes
+
+if __name__ == '__main__':
+	"""Use the main method to test parse xml's functions."""
+	pass