JSON schema compiler can't handle strings as types

tools/json_schema_compiler/h_generator.py

Index: tools/json_schema_compiler/h_generator.py
diff --git a/tools/json_schema_compiler/h_generator.py b/tools/json_schema_compiler/h_generator.py
index 35e82480649a605dd6da518822dba4d1611a6e30..9ce2868d3843ec5785ac536a9af7ab47daddbe13 100644
--- a/tools/json_schema_compiler/h_generator.py
+++ b/tools/json_schema_compiler/h_generator.py
@@ -179,6 +179,11 @@ class HGenerator(object):
       c.Substitute({'classname': classname, 'item_type':
           self._cpp_type_generator.GetType(type_.item_type,
                                            wrap_optional=True)})
+    elif type_.type_ == PropertyType.STRING:
+      if type_.description:
+        c.Comment(type_.description)
+      c.Append('typedef std::string %(classname)s;')
+      c.Substitute({'classname': classname})
     else:
       if type_.description:
         c.Comment(type_.description)