IDL: Support optional argument default value syntax

Source/bindings/tests/results/V8TestInterfaceNamedConstructor.cpp

 // 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.
 
 // This file has been auto-generated by code_generator_v8.py. DO NOT MODIFY!
 
 #include "config.h"
 #include "V8TestInterfaceNamedConstructor.h"
 
 #include "RuntimeEnabledFeatures.h"
@@ skipping 92 matching lines @@
     V8StringResource<> defaultUndefinedOptionalStringArg;
     V8StringResource<> defaultNullStringOptionalstringArg;
     V8StringResource<> optionalStringArg;
     {
         v8::TryCatch block;
         V8RethrowTryCatchScope rethrow(block);
         TOSTRING_VOID_INTERNAL(stringArg, info[0]);
         TONATIVE_VOID_INTERNAL(defaultUndefinedOptionalBooleanArg, info[1]->BooleanValue());
         TONATIVE_VOID_EXCEPTIONSTATE_INTERNAL(defaultUndefinedOptionalLongArg, toInt32(info[2], exceptionState), exceptionState);
         TOSTRING_VOID_INTERNAL(defaultUndefinedOptionalStringArg, info[3]);
-        TOSTRING_VOID_INTERNAL(defaultNullStringOptionalstringArg, argumentOrNull(info, 4));
+        if (info.Length() > 4) {
+            TOSTRING_VOID_INTERNAL(defaultNullStringOptionalstringArg, info[4]);
+        } else {
+            defaultNullStringOptionalstringArg = String();
+        }
         if (UNLIKELY(info.Length() <= 5)) {
             RefPtr<TestInterfaceNamedConstructor> impl = TestInterfaceNamedConstructor::createForJSConstructor(stringArg, defaultUndefinedOptionalBooleanArg, defaultUndefinedOptionalLongArg, defaultUndefinedOptionalStringArg, defaultNullStringOptionalstringArg);
             v8::Handle<v8::Object> wrapper = info.Holder();
             V8DOMWrapper::associateObjectWithWrapper<V8TestInterfaceNamedConstructor>(impl.release(), &V8TestInterfaceNamedConstructorConstructor::wrapperTypeInfo, wrapper, isolate, WrapperConfiguration::Dependent);
             v8SetReturnValue(info, wrapper);
             return;
         }
         TOSTRING_VOID_INTERNAL(optionalStringArg, info[5]);
     }
     RefPtr<TestInterfaceNamedConstructor> impl = TestInterfaceNamedConstructor::createForJSConstructor(*document, stringArg, defaultUndefinedOptionalBooleanArg, defaultUndefinedOptionalLongArg, defaultUndefinedOptionalStringArg, defaultNullStringOptionalstringArg, optionalStringArg, exceptionState);
@@ skipping 99 matching lines @@
     fromInternalPointer(object)->deref();
 }
 
 template<>
 v8::Handle<v8::Value> toV8NoInline(TestInterfaceNamedConstructor* impl, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
 {
     return toV8(impl, creationContext, isolate);
 }
 
 } // namespace WebCore