Implement Asynchronous Module Definition API for Mojo

gin/arguments.cc

 // 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.
 
 #include "gin/arguments.h"
 
 #include <sstream>
 #include "gin/converter.h"
 
 namespace gin {
 
 Arguments::Arguments(const v8::FunctionCallbackInfo<v8::Value>& info)
     : isolate_(info.GetIsolate()),
       info_(info),
       next_(0),
       insufficient_arguments_(false) {
 }
 
 Arguments::~Arguments() {
 }
 
+v8::Handle<v8::Value> Arguments::PeekNext() {
+  if (next_ >= info_.Length())
+    return v8::Handle<v8::Value>();
+  return info_[next_];
+}
+
 void Arguments::ThrowError() {
   if (insufficient_arguments_)
     return ThrowTypeError("Insufficient number of arguments.");
 
   std::stringstream stream;
   stream << "Error processing argument " << next_ - 1 << ".";
   ThrowTypeError(stream.str());
 }
 
 void Arguments::ThrowTypeError(const std::string& message) {
   isolate_->ThrowException(v8::Exception::TypeError(
       StringToV8(isolate_, message)));
 }
 
 }  // namespace gin