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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 file.
#ifndef GIN_CONVERTER_H_
#define GIN_CONVERTER_H_
#include <stdint.h>
#include <string>
#include <vector>
#include "base/logging.h"
#include "base/strings/string_piece.h"
#include "gin/gin_export.h"
#include "v8/include/v8.h"
namespace gin {
template<typename KeyType>
bool SetProperty(v8::Isolate* isolate,
v8::Local<v8::Object> object,
KeyType key,
v8::Local<v8::Value> value) {
auto maybe =
object->DefineOwnProperty(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 GIN_EXPORT 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);
};
template<>
struct GIN_EXPORT 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 GIN_EXPORT 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 GIN_EXPORT 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 GIN_EXPORT 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 GIN_EXPORT 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 GIN_EXPORT 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 GIN_EXPORT Converter<base::StringPiece> {
// This crashes when val.size() > v8::String::kMaxLength.
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 GIN_EXPORT Converter<std::string> {
// This crashes when val.size() > v8::String::kMaxLength.
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);
};
template<>
struct GIN_EXPORT Converter<v8::Local<v8::Function> > {
static bool FromV8(v8::Isolate* isolate,
v8::Local<v8::Value> val,
v8::Local<v8::Function>* out);
};
template<>
struct GIN_EXPORT 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 GIN_EXPORT Converter<v8::Local<v8::ArrayBuffer> > {
static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
v8::Local<v8::ArrayBuffer> val);
static bool FromV8(v8::Isolate* isolate,
v8::Local<v8::Value> val,
v8::Local<v8::ArrayBuffer>* out);
};
template<>
struct GIN_EXPORT 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 GIN_EXPORT 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::MaybeLocal<v8::Value> ToV8(v8::Local<v8::Context> context,
const std::vector<T>& val) {
v8::Isolate* isolate = context->GetIsolate();
v8::Local<v8::Array> result(
v8::Array::New(isolate, static_cast<int>(val.size())));
for (uint32_t i = 0; i < val.size(); ++i) {
auto maybe = result->Set(context, i, Converter<T>::ToV8(isolate, val[i]));
if (maybe.IsNothing() || !maybe.FromJust())
return v8::MaybeLocal<v8::Value>();
}
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) {
v8::Local<v8::Value> v8_item;
if (!array->Get(isolate->GetCurrentContext(), i).ToLocal(&v8_item))
return false;
T item;
if (!Converter<T>::FromV8(isolate, v8_item, &item))
return false;
result.push_back(item);
}
out->swap(result);
return true;
}
};
template<typename T>
struct ToV8ReturnsMaybe<std::vector<T>> {
static const bool value = true;
};
// Convenience functions that deduce T.
template<typename T>
v8::Local<v8::Value> ConvertToV8(v8::Isolate* isolate, T input) {
return Converter<T>::ToV8(isolate, input);
}
template<typename T>
v8::MaybeLocal<v8::Value> ConvertToV8(v8::Local<v8::Context> context, 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,
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,
T input,
v8::Local<v8::Value>* output) {
*output = ConvertToV8(isolate, input);
return true;
}
};
template <typename T>
bool TryConvertToV8(v8::Isolate* isolate,
T input,
v8::Local<v8::Value>* output) {
return ToV8Traits<T>::TryConvertToV8(isolate, input, output);
}
// This crashes when input.size() > v8::String::kMaxLength.
GIN_EXPORT inline v8::Local<v8::String> StringToV8(
v8::Isolate* isolate,
const base::StringPiece& input) {
return ConvertToV8(isolate, input).As<v8::String>();
}
// This crashes when input.size() > v8::String::kMaxLength.
GIN_EXPORT v8::Local<v8::String> StringToSymbol(v8::Isolate* isolate,
const base::StringPiece& val);
template<typename T>
bool ConvertFromV8(v8::Isolate* isolate, v8::Local<v8::Value> input,
T* result) {
return Converter<T>::FromV8(isolate, input, result);
}
GIN_EXPORT std::string V8ToString(v8::Local<v8::Value> value);
} // namespace gin
#endif // GIN_CONVERTER_H_
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