JSON Schema Compiler supports Enums as types.

tools/json_schema_compiler/model.py

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import copy
 import os.path
 import re
 
 class ParseException(Exception):
   """Thrown when data in the model is invalid.
@@ skipping 63 matching lines @@
   - |item_type| if this is an array, the type of items in the array
   """
   def __init__(self, parent, name, json):
     if json.get('type') == 'array':
       self.type_ = PropertyType.ARRAY
       self.item_type = Property(self, name + "Element", json['items'],
                                 from_json=True,
                                 from_client=True)
     elif json.get('type') == 'string':
       self.type_ = PropertyType.STRING
+    elif 'enum' in json:
+      self.enum_values = []
+      for value in json['enum']:
+        self.enum_values.append(value)
+      self.type_ = PropertyType.ENUM
     else:
       if not (
           'properties' in json or
           'additionalProperties' in json or
           'functions' in json or
           'events' in json):
         raise ParseException(self, name + " has no properties or functions")
       self.type_ = PropertyType.OBJECT
     self.name = name
     self.description = json.get('description')
@@ skipping 292 matching lines @@
   of |json|.
   """
   model.properties = {}
   for name, property_json in json.get('properties', {}).items():
     model.properties[name] = Property(
         model,
         name,
         property_json,
         from_json=from_json,
         from_client=from_client)