DCAE-D tosca-lab initial commit

DCAE-D tosca-lab initial commit

Change-Id: Ia42934ce7c75abe05fa106585c9334c8b048ee36
Issue-ID: SDC-1218
Signed-off-by: Stone, Avi (as206k) <as206k@att.com>

1 files changed, 63 insertions, 0 deletions

diff --git a/app/toscalib/utils/yamlparser.py b/app/toscalib/utils/yamlparser.py
new file mode 100644
index 0000000..e54227d
--- /dev/null
+++ b/app/toscalib/utils/yamlparser.py
@@ -0,0 +1,63 @@
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+import codecs
+from collections import OrderedDict
+
+import yaml
+
+
+if hasattr(yaml, 'CSafeLoader'):
+    yaml_loader = yaml.CSafeLoader
+else:
+    yaml_loader = yaml.SafeLoader
+
+
+def load_yaml(path):
+    with codecs.open(path, encoding='utf-8', errors='strict') as f:
+        return yaml.load(f.read(), Loader=yaml_loader)
+
+
+def simple_parse(tmpl_str):
+    try:
+        tpl = yaml.load(tmpl_str, Loader=yaml_loader)
+    except yaml.YAMLError as yea:
+        raise ValueError(yea)
+    else:
+        if tpl is None:
+            tpl = {}
+    return tpl
+
+
+def ordered_load(stream, Loader=yaml.Loader, object_pairs_hook=OrderedDict):
+    class OrderedLoader(Loader):
+        pass
+
+    def construct_mapping(loader, node):
+        loader.flatten_mapping(node)
+        return object_pairs_hook(loader.construct_pairs(node))
+
+    OrderedLoader.add_constructor(
+        yaml.resolver.BaseResolver.DEFAULT_MAPPING_TAG,
+        construct_mapping)
+    return yaml.load(stream, OrderedLoader)
+
+
+def simple_ordered_parse(tmpl_str):
+    try:
+        tpl = ordered_load(tmpl_str)
+    except yaml.YAMLError as yea:
+        raise ValueError(yea)
+    else:
+        if tpl is None:
+            tpl = {}
+    return tpl