Support overloaded constructors.

tools/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 json
@@ skipping 204 matching lines @@
   return info
 
 
 def AnalyzeConstructor(interface):
   """Returns an OperationInfo object for the constructor.
 
   Returns None if the interface has no Constructor.
   """
   if 'Constructor' in interface.ext_attrs:
     name = None
-    func_value = interface.ext_attrs.get('Constructor')
-    if not func_value:
-      args = []
-      idl_args = []
+    overloads = interface.ext_attrs['Constructor']
+    idl_args = [[] if f is None else f.arguments for f in overloads]
   elif 'NamedConstructor' in interface.ext_attrs:
     func_value = interface.ext_attrs.get('NamedConstructor')
+    idl_args = [func_value.arguments]
     name = func_value.id
   else:
     return None
 
-  if func_value:
-    idl_args = func_value.arguments
-    args =_BuildArguments([idl_args], interface, True)
-
   info = OperationInfo()
   info.overloads = None
   info.idl_args = idl_args
   info.declared_name = name
   info.name = name
   info.constructor_name = None
   info.js_name = name
   info.type_name = interface.id
-  info.param_infos = args
+  info.param_infos = _BuildArguments(idl_args, interface, constructor=True)
   info.requires_named_arguments = False
   info.pure_dart_constructor = False
   return info
 
 def IsDartListType(type):
   return type == 'List' or type.startswith('sequence<')
 
 def IsDartCollectionType(type):
   return IsDartListType(type)
 
@@ skipping 1188 matching lines @@
                                   self)
 
     if type_data.clazz == 'SVGTearOff':
       dart_interface_name = self._renamer.RenameInterface(
           self._database.GetInterface(type_name))
       return SVGTearOffIDLTypeInfo(
           type_name, type_data, dart_interface_name, self)
 
     class_name = '%sIDLTypeInfo' % type_data.clazz
     return globals()[class_name](type_name, type_data)