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Native Abstractions for Node.js: C++ header for Node 0.8 -> 18 compatibility

There is a newer version: 2.19.0

/*********************************************************************
 * NAN - Native Abstractions for Node.js
 *
 * Copyright (c) 2018 NAN contributors
 *
 * MIT License 
 ********************************************************************/

#ifndef NAN_CONVERTERS_H_
#define NAN_CONVERTERS_H_

namespace imp {
template struct ToFactoryBase {
  typedef MaybeLocal return_t;
};
template struct ValueFactoryBase { typedef Maybe return_t; };

template struct ToFactory;

template<>
struct ToFactory : ToFactoryBase {
  static inline return_t convert(v8::Local val) {
    if (val.IsEmpty() || !val->IsFunction()) return MaybeLocal();
    return MaybeLocal(val.As());
  }
};

#define X(TYPE)                                                                \
    template<>                                                                 \
    struct ToFactory : ToFactoryBase {                     \
      static inline return_t convert(v8::Local val);                \
    };

X(Boolean)
X(Number)
X(String)
X(Object)
X(Integer)
X(Uint32)
X(Int32)

#undef X

#define X(TYPE)                                                                \
    template<>                                                                 \
    struct ToFactory : ValueFactoryBase {                          \
      static inline return_t convert(v8::Local val);                \
    };

X(bool)
X(double)
X(int64_t)
X(uint32_t)
X(int32_t)

#undef X
}  // end of namespace imp

template
inline
typename imp::ToFactory::return_t To(v8::Local val) {
  return imp::ToFactory::convert(val);
}

#if defined(V8_MAJOR_VERSION) && (V8_MAJOR_VERSION > 4 ||                      \
  (V8_MAJOR_VERSION == 4 && defined(V8_MINOR_VERSION) && V8_MINOR_VERSION >= 3))
# include "nan_converters_43_inl.h"
#else
# include "nan_converters_pre_43_inl.h"
#endif

#endif  // NAN_CONVERTERS_H_