Add enum class support to json_schema_compiler (idl files)

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 c64241cd62d6d66b46230ee62cf84867f0432e08..3f7584d55d5e738574b99960a5b82fd3ef792e19 100644
--- a/tools/json_schema_compiler/h_generator.py
+++ b/tools/json_schema_compiler/h_generator.py
@@ -141,13 +141,17 @@ class _Generator(object):
     """Generate a code object with the  declaration of a C++ enum.
     """
     c = Code()
-    c.Sblock('enum %s {' % enum_name)
-    c.Append(self._type_helper.GetEnumNoneValue(type_) + ',')
+    c.Sblock('enum %s%s {' % ('class ' if type_.is_enum_class else '',
+                              enum_name))
+    c.Append(self._type_helper.GetEnumNoneValue(
+        type_, is_in_declaration=True) + ',')
     for value in type_.enum_values:
-      current_enum_string = self._type_helper.GetEnumValue(type_, value)
+      current_enum_string = self._type_helper.GetEnumValue(
+          type_, value, is_in_declaration=True)
       c.Append(current_enum_string + ',')
     c.Append('%s = %s,' % (
-        self._type_helper.GetEnumLastValue(type_), current_enum_string))
+        self._type_helper.GetEnumLastValue(type_, is_in_declaration=True),
+        current_enum_string))
     c.Eblock('};')
     return c