Implement v8-like overload resolving.

lib/dom/scripts/generator.py

 #!/usr/bin/python
 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 """This module provides shared functionality for systems to generate
 Dart APIs from the IDL database."""
 
 import copy
 import re
@@ skipping 240 matching lines @@
         new_operation.arguments = new_operation.arguments[:i]
         split_operations.append(new_operation)
     split_operations.append(operation)
 
   # Zip together arguments from each overload by position, then convert
   # to a dart argument.
   args = map(lambda *args: _DartArg(args, interface),
              *(op.arguments for op in split_operations))
 
   info = OperationInfo()
+  info.operations = operations
   info.overloads = split_operations
   info.declared_name = operations[0].id
   info.name = operations[0].ext_attrs.get('DartName', info.declared_name)
   info.constructor_name = None
   info.js_name = info.declared_name
   info.type_name = DartType(operations[0].type.id)   # TODO: widen.
   info.param_infos = args
   return info
 
 
@@ skipping 250 matching lines @@
     return self._idl_type
 
   def dart_type(self):
     return self._dart_type or self._idl_type
 
   def native_type(self):
     return self._native_type or self._idl_type
 
   def emit_to_native(self, emitter, idl_node, name, handle, interface_name):
     if 'Callback' in idl_node.ext_attrs:
-      if 'RequiredCppParameter' in idl_node.ext_attrs:
+      if set(['Optional', 'Callback']).issubset(idl_node.ext_attrs.keys()):
         flag = 'DartUtilities::ConvertNullToDefaultValue'
       else:
         flag = 'DartUtilities::ConvertNone'
       emitter.Emit(
         '\n'
         '        RefPtr<$TYPE> $NAME = Dart$IDL_TYPE::create($HANDLE, $FLAG, exception);\n'
         '        if (exception)\n'
         '            goto fail;\n',
         TYPE=self.native_type(),
         NAME=name,
@@ skipping 88 matching lines @@
   def __init__(self, idl_type, dart_type, native_type=None,
                webcore_getter_name='getAttribute',
                webcore_setter_name='setAttribute'):
     super(PrimitiveIDLTypeInfo, self).__init__(idl_type, dart_type=dart_type,
         native_type=native_type)
     self._webcore_getter_name = webcore_getter_name
     self._webcore_setter_name = webcore_setter_name
 
   def emit_to_native(self, emitter, idl_node, name, handle, interface_name):
     arguments = [handle]
-    if idl_node.ext_attrs.get('Optional') == 'DefaultIsNullString' or 'RequiredCppParameter' in idl_node.ext_attrs:
+    if idl_node.ext_attrs.get('Optional') == 'DefaultIsNullString':
       arguments.append('DartUtilities::ConvertNullToDefaultValue')
     emitter.Emit(
         '\n'
         '        const ParameterAdapter<$TYPE> $NAME($ARGUMENTS);\n'
         '        if (!$NAME.conversionSuccessful()) {\n'
         '            exception = $NAME.exception();\n'
         '            goto fail;\n'
         '        }\n',
         TYPE=self.native_type(),
         NAME=name,
@@ skipping 144 matching lines @@
     '"SVGAnimatedListPropertyTearOff.h"',
     '"SVGTransformListPropertyTearOff.h"',
     '"SVGPathSegListPropertyTearOff.h"',
 ]
 
 def GetIDLTypeInfo(idl_type_name):
   match = re.match(r'sequence<(\w+)>$', idl_type_name)
   if match:
     return SequenceIDLTypeInfo(idl_type_name, GetIDLTypeInfo(match.group(1)))
   return _idl_type_registry.get(idl_type_name, IDLTypeInfo(idl_type_name))