Begin implementing V8 bindings 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() {
+}
+
+void Arguments::ThrowError() {
+  if (insufficient_arguments_)
+    return ThrowTypeError("Insufficient number of arguments.");
+
+  std::stringstream stream;
+  stream << "Error processing argument " << next_ - 1 << ".";

[Aaron Boodman, 2013/11/11 21:37:32]

This will do the wrong thing when the client calls GetNext() after there was an
error. You need to save whether or not you are in an error state.

[Aaron Boodman, 2013/11/11 21:38:59]

Nevermind. LGTM.

+  ThrowTypeError(stream.str());
+}
+
+void Arguments::ThrowTypeError(const std::string& message) {
+  isolate_->ThrowException(v8::Exception::TypeError(
+      StringToV8(isolate_, message)));
+}
+
+}  // namespace gin