Add default namespace parameter

Add an new argument to the generator which will start to parse
the XML data assuming that namespace contains all classes and information.

README.rst

@@ -39,10 +39,13 @@ The Python script has help for the arguments::
                             Path to input JSON file of namespaces
       -g CASTXML_PATH, --castxml-path CASTXML_PATH
                             Path to castxml
+      -d DEFAULT_NAMESPACE, --default_namespace DEFAULT_NAMESPACE
+                            value to use as the default namespace
       --includes INCLUDES, -i INCLUDES
                             Path to the includes directory.
       --no-generation, -n   Only print name of files to be generated
 
+
 To run over the entirety of the local example, we use a command like this::
 
   $ python3 generator.py -g ~/Work/TRI/CastXML/build/bin/castxml -s ~/Work/TRI/wrapper_generator/example/

generator.py

@@ -241,7 +241,10 @@ def parse(options):
   pygccxml.utils.loggers.cxx_parser.setLevel(logging.CRITICAL)
   pygccxml.declarations.scopedef_t.RECURSIVE_DEFAULT = False
   pygccxml.declarations.scopedef_t.ALLOW_EMPTY_MDECL_WRAPPER = True
-  name_data = total[0] #.namespace("drake")
+
+  name_data = total[0]
+  if options.default_namespace:
+    name_data = total[0].namespace(options.default_namespace)
   for declared_class in results['decls']:
     print(declared_class)
     if declared_class in [x.name for x in total[0].classes()]:
@@ -274,6 +277,13 @@ arg.add_argument(
   dest="castxml_path",
   help="Path to castxml",
   required=True)
+arg.add_argument(
+  "-d",
+  "--default_namespace",
+  action="store",
+  dest="default_namespace",
+  help="value to use as the default namespace",
+  required=False)
 arg.add_argument('--includes', '-i', type=str,
                     help='Path to the includes directory.',
                     action="append",