From 7f7fa2f91467fdb2b11312be8562e7b51fdeb199 Mon Sep 17 00:00:00 2001
From: Sebastian Koslowski <sebastian.koslowski@gmail.com>
Date: Tue, 3 May 2016 17:13:08 +0200
Subject: grc: added yaml/mako support
Includes basic converter from XML/Cheetah to YAML/Mako based block format.
---
grc/converter/xml.py | 82 ++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 82 insertions(+)
create mode 100644 grc/converter/xml.py
(limited to 'grc/converter/xml.py')
diff --git a/grc/converter/xml.py b/grc/converter/xml.py
new file mode 100644
index 0000000000..2eda786c0f
--- /dev/null
+++ b/grc/converter/xml.py
@@ -0,0 +1,82 @@
+# 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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