$$ This is a pump file for generating file templates.  Pump is a python
$$ script that is part of the Google Test suite of utilities.  Description
$$ can be found here:
$$
$$ http://code.google.com/p/googletest/wiki/PumpManual
$$
$var MAX_ARITY = 6
// Copyright (c) 2014 GitHub, Inc. All rights reserved.
// Use of this source code is governed by the MIT license that can be
// found in the LICENSE file.

#include "base/bind.h"
#include "base/callback.h"
#include "native_mate/function_template.h"
#include "native_mate/locker.h"
#include "native_mate/scoped_persistent.h"

namespace mate {

namespace internal {

typedef scoped_refptr<RefCountedPersistent<v8::Function> > SafeV8Function;

// Helper to convert type to V8 with storage type (const T& to T).
template<typename T>
v8::Handle<v8::Value> ConvertToV8(v8::Isolate* isolate, T a) {
  return Converter<typename base::internal::CallbackParamTraits<T>::StorageType>
      ::ToV8(isolate, a);
}

// This set of templates invokes a V8::Function by converting the C++ types.
template<typename Sig>
struct V8FunctionInvoker;

$range ARITY 0..MAX_ARITY
$for ARITY [[
$range ARG 1..ARITY

template<typename R$for ARG [[, typename P$(ARG)]]>
struct V8FunctionInvoker<R($for ARG , [[P$(ARG)]])> {
  static R Go(v8::Isolate* isolate, SafeV8Function function$for ARG [[, P$(ARG) a$(ARG)]]) {
    R ret;
    Locker locker(isolate);
    MATE_HANDLE_SCOPE(isolate);
    v8::Handle<v8::Function> holder = function->NewHandle();

$if ARITY == 0 [[
    v8::Handle<v8::Value> val(holder->Call(holder, 0, NULL));
]] $else [[
    v8::Handle<v8::Value> args[] = {
$for ARG [[

        ConvertToV8(isolate, a$(ARG)),
]]

    };
    v8::Handle<v8::Value> val(holder->Call(holder, arraysize(args), args));
]]

    Converter<R>::FromV8(isolate, val, &ret);
    return ret;
  }
};

template<$for ARG , [[typename P$(ARG)]]>
struct V8FunctionInvoker<void($for ARG , [[P$(ARG)]])> {
  static void Go(v8::Isolate* isolate, SafeV8Function function$for ARG [[, P$(ARG) a$(ARG)]]) {
    Locker locker(isolate);
    MATE_HANDLE_SCOPE(isolate);
    v8::Handle<v8::Function> holder = function->NewHandle();

$if ARITY == 0 [[
    holder->Call(holder, 0, NULL);
]] $else [[
    v8::Handle<v8::Value> args[] = {
$for ARG [[

        ConvertToV8(isolate, a$(ARG)),
]]

    };
    holder->Call(holder, arraysize(args), args);
]]

  }
};

]]

}  // namespace internal

template<typename Sig>
struct Converter<base::Callback<Sig> > {
  static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate,
                                    const base::Callback<Sig>& val) {
    return CreateFunctionTemplate(isolate, val)->GetFunction();
  }
  static bool FromV8(v8::Isolate* isolate,
                     v8::Handle<v8::Value> val,
                     base::Callback<Sig>* out) {
    if (!val->IsFunction())
      return false;

    internal::SafeV8Function function(
        new RefCountedPersistent<v8::Function>(val));
    *out = base::Bind(&internal::V8FunctionInvoker<Sig>::Go, isolate, function);
    return true;
  }
};

}  // namespace mate