Mojo: Add support for constants to the IDL compiler.

mojo/public/tools/bindings/pylib/mojom/parse/translate.py

 # Copyright 2014 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.
 
 """Translates parse tree to Mojom IR."""
 
 
 import ast
 
 
@@ skipping 65 matching lines @@
 def _MapEnumField(tree):
   return {'name': tree[1],
           'value': tree[2]}
 
 def _MapStruct(tree):
   struct = {}
   struct['name'] = tree[1]
   struct['attributes'] = _MapAttributes(tree[2])
   struct['fields'] = _MapTree(_MapField, tree[3], 'FIELD')
   struct['enums'] = _MapTree(_MapEnum, tree[3], 'ENUM')
+  struct['constants'] = _MapTree(_MapConstant, tree[3], 'CONST')
   return struct
 
 def _MapInterface(tree):
   interface = {}
   interface['name'] = tree[1]
   interface['peer'] = _GetAttribute(tree[2], 'Peer')
   interface['methods'] = _MapTree(_MapMethod, tree[3], 'METHOD')
   interface['enums'] = _MapTree(_MapEnum, tree[3], 'ENUM')
+  interface['constants'] = _MapTree(_MapConstant, tree[3], 'CONST')
   return interface
 
 def _MapEnum(tree):
   enum = {}
   enum['name'] = tree[1]
   enum['fields'] = _MapTree(_MapEnumField, tree[2], 'ENUM_FIELD')
   return enum
 
+def _MapConstant(tree):
+  constant = {}
+  constant['name'] = tree[2]
+  constant['kind'] = _MapKind(tree[1])
+  constant['value'] = tree[3]
+  return constant
+
 def _MapModule(tree, name):
   mojom = {}
   mojom['name'] = name
   mojom['namespace'] = tree[1]
   mojom['attributes'] = _MapAttributes(tree[2])
   mojom['structs'] = _MapTree(_MapStruct, tree[3], 'STRUCT')
   mojom['interfaces'] = _MapTree(_MapInterface, tree[3], 'INTERFACE')
   mojom['enums'] = _MapTree(_MapEnum, tree[3], 'ENUM')
+  mojom['constants'] = _MapTree(_MapConstant, tree[3], 'CONST')
   return mojom
 
 def _MapImport(tree):
   import_item = {}
   import_item['filename'] = tree[1]
   return import_item
 
 
 class _MojomBuilder(object):
   def __init__(self):
     self.mojom = {}
 
   def Build(self, tree, name):
     modules = [_MapModule(item, name) for item in tree if item[0] == 'MODULE']
     if len(modules) != 1:
       raise Exception('A mojom file must contain exactly 1 module.')
     self.mojom = modules[0]
     self.mojom['imports'] = _MapTree(_MapImport, tree, 'IMPORT')
     return self.mojom
 
 
 def Translate(tree, name):
   return _MojomBuilder().Build(tree, name)