Support optional, non-defaulted constructor arguments.

Source/bindings/scripts/v8_interface.py

 # Copyright (C) 2013 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 435 matching lines @@
 
 
 ################################################################################
 # Constructors
 ################################################################################
 
 # [Constructor]
 def generate_constructor(interface, constructor):
     return {
         'argument_list': constructor_argument_list(interface, constructor),
-        'arguments': [constructor_argument(argument, index)
+        'arguments': [constructor_argument(interface, constructor, argument, index)
                       for index, argument in enumerate(constructor.arguments)],
         'has_exception_state':
             # [RaisesException=Constructor]
             interface.extended_attributes.get('RaisesException') == 'Constructor' or
             any(argument for argument in constructor.arguments
                 if argument.idl_type.name == 'SerializedScriptValue' or
                    argument.idl_type.is_integer_type),
         'is_constructor': True,
+        'is_named_constructor': False,
         'is_variadic': False,  # Required for overload resolution
         'number_of_required_arguments':
             number_of_required_arguments(constructor),
     }
 
 
 def constructor_argument_list(interface, constructor):
     arguments = []
     # [ConstructorCallWith=ExecutionContext]
     if has_extended_attribute_value(interface, 'ConstructorCallWith', 'ExecutionContext'):
         arguments.append('context')
     # [ConstructorCallWith=Document]
     if has_extended_attribute_value(interface, 'ConstructorCallWith', 'Document'):
         arguments.append('document')
 
     arguments.extend([argument.name for argument in constructor.arguments])
 
     # [RaisesException=Constructor]
     if interface.extended_attributes.get('RaisesException') == 'Constructor':
         arguments.append('exceptionState')
 
     return arguments
 
 
-def constructor_argument(argument, index):
+def constructor_argument(interface, constructor, argument, index):
     idl_type = argument.idl_type
     return {
+        'cpp_value':
+            v8_methods.cpp_value(interface, constructor, index),
         'has_default': 'Default' in argument.extended_attributes,
-        'idl_type_object': idl_type,
         # Dictionary is special-cased, but arrays and sequences shouldn't be
         'idl_type': not idl_type.array_or_sequence_type and idl_type.base_type,
+        'idl_type_object': idl_type,
         'index': index,
         'is_optional': argument.is_optional,
         'is_strict_type_checking': False,  # Required for overload resolution
         'name': argument.name,
         'v8_value_to_local_cpp_value':
             v8_methods.v8_value_to_local_cpp_value(argument, index),
     }
 
 
 def generate_constructor_overloads(constructors):
@@ skipping 11 matching lines @@
 def generate_named_constructor(interface):
     extended_attributes = interface.extended_attributes
     if 'NamedConstructor' not in extended_attributes:
         return None
     # FIXME: parser should return named constructor separately;
     # included in constructors (and only name stored in extended attribute)
     # for Perl compatibility
     idl_constructor = interface.constructors[0]
     constructor = generate_constructor(interface, idl_constructor)
     constructor['argument_list'].insert(0, '*document')
-    constructor['name'] = extended_attributes['NamedConstructor']
+    constructor.update({
+        'name': extended_attributes['NamedConstructor'],
+        'is_named_constructor': True,
+    })
     return constructor
 
 
 def number_of_required_arguments(constructor):
     return len([argument for argument in constructor.arguments
                 if not argument.is_optional])
 
 
 def interface_length(interface, constructors):
     # Docs: http://heycam.github.io/webidl/#es-interface-call
@@ skipping 187 matching lines @@
         deleter = next(
             method
             for method in interface.operations
             if ('deleter' in method.specials and
                 len(method.arguments) == 1 and
                 str(method.arguments[0].idl_type) == 'DOMString'))
     except StopIteration:
         return None
 
     return property_deleter(deleter)