mojo: Generate top level enums for python bindings.

mojo/public/tools/bindings/pylib/mojom/generate/data.py

 # Copyright 2013 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.
 
 # TODO(vtl): "data" is a pretty vague name. Rename it?
 
 import copy
 
 import module as mojom
 
@@ skipping 84 matching lines @@
 
   return values.get(name)
 
 def FixupExpression(module, value, scope, kind):
   """Translates an IDENTIFIER into a built-in value or structured NamedValue
      object."""
   if isinstance(value, tuple) and value[0] == 'IDENTIFIER':
     # Allow user defined values to shadow builtins.
     result = LookupValue(module.values, value[1], scope, kind)
     if result:
+      if isinstance(result, tuple):
+        raise Exception('Unable to resolve expression: %r' % value[1])

[viettrungluu, 2014/09/05 17:05:30]

Does this properly handle, e.g., using constants as default values to fields?

[qsr, 2014/09/08 09:06:08]

 Yes, we do have this in our test cases
(mojo/public/interfaces/bindings/tests/sample_service.mojom). What it prevents
us to do is used a constant as a value for an enum. If we want to support this,
we will need to have LookupValue returns the right NamedValue here instead of
letting the  tuple untouched.

       return result
     if IsBuiltinValue(value[1]):
       return mojom.BuiltinValue(value[1])
   return value
 
 def KindToData(kind):
   return kind.spec
 
 def KindFromData(kinds, data, scope):
   kind = LookupKind(kinds, data, scope)
@@ skipping 257 matching lines @@
 
 def OrderedModuleFromData(data):
   module = ModuleFromData(data)
   for interface in module.interfaces:
     next_ordinal = 0
     for method in interface.methods:
       if method.ordinal is None:
         method.ordinal = next_ordinal
       next_ordinal = method.ordinal + 1
   return module