Electron
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native-mate
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native-mate/native_mate/converter.h

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// 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.chromium file.
#ifndef NATIVE_MATE_CONVERTER_H_
#define NATIVE_MATE_CONVERTER_H_
#include <map>
#include <string>
#include <vector>
#include <set>
#include "base/strings/string_piece.h"
#include "v8/include/v8.h"
namespace mate {
template<typename KeyType>
bool SetProperty(v8::Isolate* isolate,
v8::Local<v8::Object> object,
KeyType key,
v8::Local<v8::Value> value) {
auto maybe = object->Set(isolate->GetCurrentContext(), key, value);
return !maybe.IsNothing() && maybe.FromJust();
}
template<typename T>
struct ToV8ReturnsMaybe {
static const bool value = false;
};
template<typename T, typename Enable = void>
struct Converter {};
template<>
struct Converter<void*> {
static v8::Local<v8::Value> ToV8(v8::Isolate* isolate, void* val) {
return v8::Undefined(isolate);
}
};
template<>
struct Converter<std::nullptr_t> {
static v8::Local<v8::Value> ToV8(v8::Isolate* isolate, std::nullptr_t val) {
return v8::Null(isolate);
}
};
template<>
struct Converter<bool> {
static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
bool val);
static bool FromV8(v8::Isolate* isolate,
v8::Local<v8::Value> val,
bool* out);
};
#if !defined(OS_LINUX) && !defined(OS_FREEBSD)
template<>
struct Converter<unsigned long> {
static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
unsigned long val);
static bool FromV8(v8::Isolate* isolate,
v8::Local<v8::Value> val,
unsigned long* out);
};
#endif
template<>
struct Converter<int32_t> {
static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
int32_t val);
static bool FromV8(v8::Isolate* isolate,
v8::Local<v8::Value> val,
int32_t* out);
};
template<>
struct Converter<uint32_t> {
static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
uint32_t val);
static bool FromV8(v8::Isolate* isolate,
v8::Local<v8::Value> val,
uint32_t* out);
};
template<>
struct Converter<int64_t> {
// Warning: JavaScript cannot represent 64 integers precisely.
static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
int64_t val);
static bool FromV8(v8::Isolate* isolate,
v8::Local<v8::Value> val,
int64_t* out);
};
template<>
struct Converter<uint64_t> {
// Warning: JavaScript cannot represent 64 integers precisely.
static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
uint64_t val);
static bool FromV8(v8::Isolate* isolate,
v8::Local<v8::Value> val,
uint64_t* out);
};
template<>
struct Converter<float> {
static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
float val);
static bool FromV8(v8::Isolate* isolate,
v8::Local<v8::Value> val,
float* out);
};
template<>
struct Converter<double> {
static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
double val);
static bool FromV8(v8::Isolate* isolate,
v8::Local<v8::Value> val,
double* out);
};
template<>
struct Converter<const char*> {
static v8::Local<v8::Value> ToV8(v8::Isolate* isolate, const char* val);
};
template<>
struct Converter<base::StringPiece> {
static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
const base::StringPiece& val);
// No conversion out is possible because StringPiece does not contain storage.
};
template<>
struct Converter<std::string> {
static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
const std::string& val);
static bool FromV8(v8::Isolate* isolate,
v8::Local<v8::Value> val,
std::string* out);
};
v8::Local<v8::String> StringToSymbol(v8::Isolate* isolate,
const base::StringPiece& input);
std::string V8ToString(v8::Local<v8::Value> value);
template<>
struct Converter<v8::Local<v8::Function> > {
static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
v8::Local<v8::Function> val);
static bool FromV8(v8::Isolate* isolate,
v8::Local<v8::Value> val,
v8::Local<v8::Function>* out);
};
template<>
struct Converter<v8::Local<v8::Object> > {
static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
v8::Local<v8::Object> val);
static bool FromV8(v8::Isolate* isolate,
v8::Local<v8::Value> val,
v8::Local<v8::Object>* out);
};
template<>
struct Converter<v8::Local<v8::String> > {
static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
v8::Local<v8::String> val);
static bool FromV8(v8::Isolate* isolate,
v8::Local<v8::Value> val,
v8::Local<v8::String>* out);
};
template<>
struct Converter<v8::Local<v8::External> > {
static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
v8::Local<v8::External> val);
static bool FromV8(v8::Isolate* isolate,
v8::Local<v8::Value> val,
v8::Local<v8::External>* out);
};
template<>
struct Converter<v8::Local<v8::Array> > {
static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
v8::Local<v8::Array> val);
static bool FromV8(v8::Isolate* isolate,
v8::Local<v8::Value> val,
v8::Local<v8::Array>* out);
};
template<>
struct Converter<v8::Local<v8::Value> > {
static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
v8::Local<v8::Value> val);
static bool FromV8(v8::Isolate* isolate,
v8::Local<v8::Value> val,
v8::Local<v8::Value>* out);
};
template<typename T>
struct Converter<std::vector<T> > {
static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
const std::vector<T>& val) {
v8::Local<v8::Array> result(
v8::Array::New(isolate, static_cast<int>(val.size())));
for (size_t i = 0; i < val.size(); ++i) {
result->Set(static_cast<int>(i), Converter<T>::ToV8(isolate, val[i]));
}
return result;
}
static bool FromV8(v8::Isolate* isolate,
v8::Local<v8::Value> val,
std::vector<T>* out) {
if (!val->IsArray())
return false;
std::vector<T> result;
v8::Local<v8::Array> array(v8::Local<v8::Array>::Cast(val));
uint32_t length = array->Length();
for (uint32_t i = 0; i < length; ++i) {
T item;
if (!Converter<T>::FromV8(isolate, array->Get(i), &item))
return false;
result.push_back(item);
}
out->swap(result);
return true;
}
};
template<typename T>
struct Converter<std::set<T> > {
static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
const std::set<T>& val) {
v8::Local<v8::Array> result(
v8::Array::New(isolate, static_cast<int>(val.size())));
typename std::set<T>::const_iterator it;
int i;
for (i = 0, it = val.begin(); it != val.end(); ++it, ++i)
result->Set(i, Converter<T>::ToV8(isolate, *it));
return result;
}
static bool FromV8(v8::Isolate* isolate,
v8::Local<v8::Value> val,
std::set<T>* out) {
if (!val->IsArray())
return false;
std::set<T> result;
v8::Local<v8::Array> array(v8::Local<v8::Array>::Cast(val));
uint32_t length = array->Length();
for (uint32_t i = 0; i < length; ++i) {
T item;
if (!Converter<T>::FromV8(isolate, array->Get(i), &item))
return false;
result.insert(item);
}
out->swap(result);
return true;
}
};
template<typename T>
struct Converter<std::map<std::string, T> > {
static bool FromV8(v8::Isolate* isolate,
v8::Local<v8::Value> val,
std::map<std::string, T> * out) {
if (!val->IsObject())
return false;
v8::Local<v8::Object> dict = val->ToObject();
v8::Local<v8::Array> keys = dict->GetOwnPropertyNames();
for (uint32_t i = 0; i < keys->Length(); ++i) {
v8::Local<v8::Value> key = keys->Get(i);
T value;
if (Converter<T>::FromV8(isolate, dict->Get(key), &value))
(*out)[V8ToString(key)] = std::move(value);
}
return true;
}
static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
const std::map<std::string, T>& val) {
v8::Local<v8::Object> result = v8::Object::New(isolate);
for (auto i = val.begin(); i != val.end(); i++) {
result->Set(Converter<T>::ToV8(isolate, i->first),
Converter<T>::ToV8(isolate, i->second));
}
return result;
}
};
// Convenience functions that deduce T.
template<typename T>
v8::Local<v8::Value> ConvertToV8(v8::Isolate* isolate, const T& input) {
return Converter<T>::ToV8(isolate, input);
}
inline v8::Local<v8::Value> ConvertToV8(v8::Isolate* isolate,
const char* input) {
return Converter<const char*>::ToV8(isolate, input);
}
template<typename T>
v8::MaybeLocal<v8::Value> ConvertToV8(v8::Local<v8::Context> context,
const T& input) {
return Converter<T>::ToV8(context, input);
}
template<typename T, bool = ToV8ReturnsMaybe<T>::value> struct ToV8Traits;
template <typename T>
struct ToV8Traits<T, true> {
static bool TryConvertToV8(v8::Isolate* isolate,
const T& input,
v8::Local<v8::Value>* output) {
auto maybe = ConvertToV8(isolate->GetCurrentContext(), input);
if (maybe.IsEmpty())
return false;
*output = maybe.ToLocalChecked();
return true;
}
};
template <typename T>
struct ToV8Traits<T, false> {
static bool TryConvertToV8(v8::Isolate* isolate,
const T& input,
v8::Local<v8::Value>* output) {
*output = ConvertToV8(isolate, input);
return true;
}
};
template <typename T>
bool TryConvertToV8(v8::Isolate* isolate,
const T& input,
v8::Local<v8::Value>* output) {
return ToV8Traits<T>::TryConvertToV8(isolate, input, output);
}
template<typename T>
bool ConvertFromV8(v8::Isolate* isolate, v8::Local<v8::Value> input,
T* result) {
return Converter<T>::FromV8(isolate, input, result);
}
inline v8::Local<v8::String> StringToV8(
v8::Isolate* isolate,
const base::StringPiece& input) {
return ConvertToV8(isolate, input).As<v8::String>();
}
} // namespace mate
#endif // NATIVE_MATE_CONVERTER_H_
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