Support default values for complex objects in mojom.

mojo/public/bindings/generators/mojom_js_generator.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.
 
 """Generates JavaScript source files from a mojom.Module."""
 
 from generate import mojom
 from generate import mojom_pack
 from generate import mojom_generator
 
@@ skipping 15 matching lines @@
   mojom.MSGPIPE: "core.kInvalidHandle",
   mojom.INT64:   "0",
   mojom.UINT64:  "0",
   mojom.DOUBLE:  "0",
   mojom.STRING:  '""',
 }
 
 
 def JavaScriptDefaultValue(field):
   if field.default:
-    if isinstance(field.default, list):
-      # TODO(mpcomplete): This will need to be more sophisticated to support
-      # arrays of objects/arrays.
-      return "[" + ", ".join(field.default) + "]"
-    else:
-      return field.default
+    raise Exception("Default values should've been handled in jinja.")
   if field.kind in mojom.PRIMITIVES:
     return _kind_to_javascript_default_value[field.kind]
   if isinstance(field.kind, mojom.Struct):
     return "null";
   if isinstance(field.kind, mojom.Array):
     return "[]";
 
 
 def JavaScriptPayloadSize(packed):
   packed_fields = packed.packed_fields
@@ skipping 93 matching lines @@
     return "encodeArrayPointer(%s, " % GetJavaScriptType(kind.kind);
 
 
 class Generator(mojom_generator.Generator):
 
   js_filters = {
     "default_value": JavaScriptDefaultValue,
     "payload_size": JavaScriptPayloadSize,
     "decode_snippet": JavaScriptDecodeSnippet,
     "encode_snippet": JavaScriptEncodeSnippet,
+    "is_object_kind": mojom_generator.IsObjectKind,
+    "is_string_kind": mojom_generator.IsStringKind,
+    "is_array_kind": lambda kind: isinstance(kind, mojom.Array),
+    "struct_by_name": mojom_generator.GetStructByName,
     "stylize_method": mojom_generator.StudlyCapsToCamel,
+    "verify_token_type": mojom_generator.VerifyTokenType,
   }
 
   @UseJinja("js_templates/module.js.tmpl", filters=js_filters)
   def GenerateJsModule(self):
     return {
       "enums": self.module.enums,
       "structs": self.GetStructs() + self.GetStructsFromMethods(),
       "interfaces": self.module.interfaces,
     }
 
   def GenerateFiles(self):
     self.Write(self.GenerateJsModule(), "%s.js" % self.module.name)