electron/native_mate/constructor.h.pump

$$ This is a pump file for generating file templates.  Pump is a python
$$ 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 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.chromium file.

#ifndef NATIVE_MATE_WRAPPABLE_CLASS_H_
#define NATIVE_MATE_WRAPPABLE_CLASS_H_

#include "base/bind.h"
#include "base/compiler_specific.h"
#include "native_mate/wrappable.h"
#include "native_mate/function_template.h"

namespace mate {

class Wrappable;

namespace internal {

// This set of templates invokes a base::Callback by converting the Arguments
// into native types. It relies on the function_template.h to provide helper
// templates.
$range ARITY 0..MAX_ARITY
$for ARITY [[
$range ARG 1..ARITY

$if ARITY == 0 [[

]] $else [[

template<$for ARG , [[typename P$(ARG)]]>
]]

inline Wrappable* InvokeFactory(
    Arguments* args,
    const base::Callback<Wrappable*($for ARG , [[P$(ARG)]])>& callback) {
$if ARITY != 0 [[


$for ARG [[  typename CallbackParamTraits<P$(ARG)>::LocalType a$(ARG);

]]
  if ($for ARG  ||
      [[!GetNextArgument(args, 0, $if ARG == 1 [[true]] $else [[false]], &a$(ARG))]])
    return NULL;
]]

  return callback.Run($for ARG , [[a$(ARG)]]);
};

]]

}  // namespace internal


template<typename Sig>
class Constructor {
 public:
  typedef base::Callback<Sig> WrappableFactoryFunction;

  Constructor(const base::StringPiece& name) : name_(name) {}
  virtual ~Constructor() {
    MATE_PERSISTENT_RESET(constructor_);
  }

  v8::Handle<v8::FunctionTemplate> GetFunctionTemplate(
      v8::Isolate* isolate, const WrappableFactoryFunction& factory) {
    if (constructor_.IsEmpty()) {
      v8::Local<v8::FunctionTemplate> constructor = CreateFunctionTemplate(
          isolate, base::Bind(&Constructor::New, factory));
      constructor->InstanceTemplate()->SetInternalFieldCount(1);
      constructor->SetClassName(StringToV8(isolate, name_));
      MATE_PERSISTENT_ASSIGN(v8::FunctionTemplate, isolate, constructor_,
                             constructor);
    }

    return MATE_PERSISTENT_TO_LOCAL(
        v8::FunctionTemplate, isolate, constructor_);
  }

 private:
  static MATE_METHOD_RETURN_TYPE New(const WrappableFactoryFunction& factory,
                                     v8::Isolate* isolate, Arguments* args) {
    if (!args->IsConstructCall()) {
      args->ThrowError("Requires constructor call");
      MATE_METHOD_RETURN_UNDEFINED();
    }

    Wrappable* object = internal::InvokeFactory(args, factory);
    if (object)
      object->Wrap(isolate, args->GetThis());
    else
      args->ThrowError();

    MATE_METHOD_RETURN_UNDEFINED();
  }

  base::StringPiece name_;
  v8::Persistent<v8::FunctionTemplate> constructor_;

  DISALLOW_COPY_AND_ASSIGN(Constructor);
};


template<typename T>
Wrappable* NewOperatorFactory() {
  return new T;
}

template<typename T, typename Sig>
v8::Local<v8::Function> CreateConstructor(
    v8::Isolate* isolate,
    const base::StringPiece& name,
    const base::Callback<Sig>& callback) {
  v8::Local<v8::FunctionTemplate> constructor =
      Constructor<Sig>(name).GetFunctionTemplate(isolate, callback);
  T::BuildPrototype(isolate, constructor->PrototypeTemplate());
  return constructor->GetFunction();
}

}  // namespace mate

#endif  // NATIVE_MATE_WRAPPABLE_CLASS_H_