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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 <string>
#include <vector>
#include "base/strings/string_piece.h"
#include "gin/gin_export.h"
#include "v8/include/v8.h"
namespace gin {
template<typename T, typename Enable = void>
struct Converter {};
template<>
struct GIN_EXPORT Converter<bool> {
static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate,
bool val);
static bool FromV8(v8::Isolate* isolate,
v8::Handle<v8::Value> val,
bool* out);
};
template<>
struct GIN_EXPORT Converter<int32_t> {
static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate,
int32_t val);
static bool FromV8(v8::Isolate* isolate,
v8::Handle<v8::Value> val,
int32_t* out);
};
template<>
struct GIN_EXPORT Converter<uint32_t> {
static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate,
uint32_t val);
static bool FromV8(v8::Isolate* isolate,
v8::Handle<v8::Value> val,
uint32_t* out);
};
template<>
struct GIN_EXPORT Converter<int64_t> {
// Warning: JavaScript cannot represent 64 integers precisely.
static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate,
int64_t val);
static bool FromV8(v8::Isolate* isolate,
v8::Handle<v8::Value> val,
int64_t* out);
};
template<>
struct GIN_EXPORT Converter<uint64_t> {
// Warning: JavaScript cannot represent 64 integers precisely.
static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate,
uint64_t val);
static bool FromV8(v8::Isolate* isolate,
v8::Handle<v8::Value> val,
uint64_t* out);
};
template<>
struct GIN_EXPORT Converter<double> {
static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate,
double val);
static bool FromV8(v8::Isolate* isolate,
v8::Handle<v8::Value> val,
double* out);
};
template<>
struct GIN_EXPORT Converter<base::StringPiece> {
static v8::Handle<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> {
static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate,
const std::string& val);
static bool FromV8(v8::Isolate* isolate,
v8::Handle<v8::Value> val,
std::string* out);
};
template<>
struct GIN_EXPORT Converter<v8::Handle<v8::Function> > {
static bool FromV8(v8::Isolate* isolate,
v8::Handle<v8::Value> val,
v8::Handle<v8::Function>* out);
};
template<>
struct GIN_EXPORT Converter<v8::Handle<v8::Object> > {
static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate,
v8::Handle<v8::Object> val);
static bool FromV8(v8::Isolate* isolate,
v8::Handle<v8::Value> val,
v8::Handle<v8::Object>* out);
};
template<>
struct GIN_EXPORT Converter<v8::Handle<v8::ArrayBuffer> > {
static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate,
v8::Handle<v8::ArrayBuffer> val);
static bool FromV8(v8::Isolate* isolate,
v8::Handle<v8::Value> val,
v8::Handle<v8::ArrayBuffer>* out);
};
template<>
struct GIN_EXPORT Converter<v8::Handle<v8::External> > {
static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate,
v8::Handle<v8::External> val);
static bool FromV8(v8::Isolate* isolate,
v8::Handle<v8::Value> val,
v8::Handle<v8::External>* out);
};
template<>
struct GIN_EXPORT Converter<v8::Handle<v8::Value> > {
static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate,
v8::Handle<v8::Value> val);
static bool FromV8(v8::Isolate* isolate,
v8::Handle<v8::Value> val,
v8::Handle<v8::Value>* out);
};
template<typename T>
struct Converter<std::vector<T> > {
static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate,
const std::vector<T>& val) {
v8::Handle<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::Handle<v8::Value> val,
std::vector<T>* out) {
if (!val->IsArray())
return false;
std::vector<T> result;
v8::Handle<v8::Array> array(v8::Handle<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;
}
};
// Convenience functions that deduce T.
template<typename T>
v8::Handle<v8::Value> ConvertToV8(v8::Isolate* isolate,
T input) {
return Converter<T>::ToV8(isolate, input);
}
GIN_EXPORT inline v8::Handle<v8::String> StringToV8(
v8::Isolate* isolate,
const base::StringPiece& input) {
return ConvertToV8(isolate, input).As<v8::String>();
}
GIN_EXPORT v8::Handle<v8::String> StringToSymbol(v8::Isolate* isolate,
const base::StringPiece& val);
template<typename T>
bool ConvertFromV8(v8::Isolate* isolate, v8::Handle<v8::Value> input,
T* result) {
return Converter<T>::FromV8(isolate, input, result);
}
GIN_EXPORT std::string V8ToString(v8::Handle<v8::Value> value);
} // namespace gin
#endif // GIN_CONVERTER_H_
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