325 lines
9.7 KiB
C++
325 lines
9.7 KiB
C++
// Copyright 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE.chromium file.
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#ifndef NATIVE_MATE_CONVERTER_H_
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#define NATIVE_MATE_CONVERTER_H_
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#include <string>
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#include <vector>
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#include <set>
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#include "base/strings/string_piece.h"
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#include "native_mate/compat.h"
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#include "v8/include/v8.h"
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namespace mate {
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template<typename KeyType>
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bool SetProperty(v8::Isolate* isolate,
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v8::Local<v8::Object> object,
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KeyType key,
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v8::Local<v8::Value> value) {
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auto maybe = object->Set(isolate->GetCurrentContext(), key, value);
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return !maybe.IsNothing() && maybe.FromJust();
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}
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template<typename T>
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struct ToV8ReturnsMaybe {
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static const bool value = false;
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};
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template<typename T, typename Enable = void>
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struct Converter {};
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template<>
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struct Converter<void*> {
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static v8::Local<v8::Value> ToV8(v8::Isolate* isolate, void* val) {
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return MATE_UNDEFINED(isolate);
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}
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};
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template<>
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struct Converter<bool> {
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static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
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bool val);
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static bool FromV8(v8::Isolate* isolate,
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v8::Local<v8::Value> val,
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bool* out);
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};
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#if !defined(OS_LINUX)
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template<>
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struct Converter<unsigned long> {
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static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
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unsigned long val);
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static bool FromV8(v8::Isolate* isolate,
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v8::Local<v8::Value> val,
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unsigned long* out);
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};
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#endif
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template<>
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struct Converter<int32_t> {
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static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
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int32_t val);
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static bool FromV8(v8::Isolate* isolate,
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v8::Local<v8::Value> val,
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int32_t* out);
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};
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template<>
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struct Converter<uint32_t> {
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static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
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uint32_t val);
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static bool FromV8(v8::Isolate* isolate,
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v8::Local<v8::Value> val,
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uint32_t* out);
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};
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template<>
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struct Converter<int64_t> {
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// Warning: JavaScript cannot represent 64 integers precisely.
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static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
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int64_t val);
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static bool FromV8(v8::Isolate* isolate,
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v8::Local<v8::Value> val,
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int64_t* out);
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};
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template<>
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struct Converter<uint64_t> {
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// Warning: JavaScript cannot represent 64 integers precisely.
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static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
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uint64_t val);
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static bool FromV8(v8::Isolate* isolate,
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v8::Local<v8::Value> val,
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uint64_t* out);
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};
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template<>
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struct Converter<float> {
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static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
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float val);
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static bool FromV8(v8::Isolate* isolate,
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v8::Local<v8::Value> val,
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float* out);
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};
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template<>
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struct Converter<double> {
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static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
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double val);
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static bool FromV8(v8::Isolate* isolate,
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v8::Local<v8::Value> val,
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double* out);
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};
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template<>
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struct Converter<const char*> {
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static v8::Local<v8::Value> ToV8(v8::Isolate* isolate, const char* val);
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};
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template<>
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struct Converter<base::StringPiece> {
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static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
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const base::StringPiece& val);
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// No conversion out is possible because StringPiece does not contain storage.
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};
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template<>
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struct Converter<std::string> {
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static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
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const std::string& val);
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static bool FromV8(v8::Isolate* isolate,
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v8::Local<v8::Value> val,
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std::string* out);
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};
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template<>
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struct Converter<v8::Local<v8::Function> > {
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static bool FromV8(v8::Isolate* isolate,
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v8::Local<v8::Value> val,
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v8::Local<v8::Function>* out);
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};
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template<>
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struct Converter<v8::Local<v8::Object> > {
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static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
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v8::Local<v8::Object> val);
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static bool FromV8(v8::Isolate* isolate,
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v8::Local<v8::Value> val,
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v8::Local<v8::Object>* out);
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};
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template<>
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struct Converter<v8::Local<v8::String> > {
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static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
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v8::Local<v8::String> val);
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static bool FromV8(v8::Isolate* isolate,
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v8::Local<v8::Value> val,
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v8::Local<v8::String>* out);
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};
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template<>
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struct Converter<v8::Local<v8::External> > {
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static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
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v8::Local<v8::External> val);
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static bool FromV8(v8::Isolate* isolate,
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v8::Local<v8::Value> val,
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v8::Local<v8::External>* out);
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};
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template<>
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struct Converter<v8::Local<v8::Array> > {
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static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
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v8::Local<v8::Array> val);
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static bool FromV8(v8::Isolate* isolate,
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v8::Local<v8::Value> val,
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v8::Local<v8::Array>* out);
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};
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template<>
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struct Converter<v8::Local<v8::Value> > {
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static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
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v8::Local<v8::Value> val);
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static bool FromV8(v8::Isolate* isolate,
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v8::Local<v8::Value> val,
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v8::Local<v8::Value>* out);
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};
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template<typename T>
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struct Converter<std::vector<T> > {
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static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
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const std::vector<T>& val) {
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v8::Local<v8::Array> result(
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MATE_ARRAY_NEW(isolate, static_cast<int>(val.size())));
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for (size_t i = 0; i < val.size(); ++i) {
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result->Set(static_cast<int>(i), Converter<T>::ToV8(isolate, val[i]));
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}
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return result;
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}
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static bool FromV8(v8::Isolate* isolate,
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v8::Local<v8::Value> val,
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std::vector<T>* out) {
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if (!val->IsArray())
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return false;
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std::vector<T> result;
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v8::Local<v8::Array> array(v8::Local<v8::Array>::Cast(val));
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uint32_t length = array->Length();
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for (uint32_t i = 0; i < length; ++i) {
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T item;
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if (!Converter<T>::FromV8(isolate, array->Get(i), &item))
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return false;
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result.push_back(item);
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}
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out->swap(result);
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return true;
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}
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};
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template<typename T>
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struct Converter<std::set<T> > {
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static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
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const std::set<T>& val) {
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v8::Local<v8::Array> result(
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MATE_ARRAY_NEW(isolate, static_cast<int>(val.size())));
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typename std::set<T>::const_iterator it;
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int i;
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for (i = 0, it = val.begin(); it != val.end(); ++it, ++i)
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result->Set(i, Converter<T>::ToV8(isolate, *it));
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return result;
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}
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static bool FromV8(v8::Isolate* isolate,
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v8::Local<v8::Value> val,
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std::set<T>* out) {
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if (!val->IsArray())
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return false;
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std::set<T> result;
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v8::Local<v8::Array> array(v8::Local<v8::Array>::Cast(val));
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uint32_t length = array->Length();
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for (uint32_t i = 0; i < length; ++i) {
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T item;
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if (!Converter<T>::FromV8(isolate, array->Get(i), &item))
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return false;
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result.push_back(item);
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}
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out->swap(result);
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return true;
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}
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};
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// Convenience functions that deduce T.
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template<typename T>
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v8::Local<v8::Value> ConvertToV8(v8::Isolate* isolate, const T& input) {
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return Converter<T>::ToV8(isolate, input);
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}
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inline v8::Local<v8::Value> ConvertToV8(v8::Isolate* isolate,
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const char* input) {
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return Converter<const char*>::ToV8(isolate, input);
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}
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template<typename T>
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v8::MaybeLocal<v8::Value> ConvertToV8(v8::Local<v8::Context> context,
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const T& input) {
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return Converter<T>::ToV8(context, input);
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}
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template<typename T, bool = ToV8ReturnsMaybe<T>::value> struct ToV8Traits;
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template <typename T>
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struct ToV8Traits<T, true> {
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static bool TryConvertToV8(v8::Isolate* isolate,
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const T& input,
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v8::Local<v8::Value>* output) {
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auto maybe = ConvertToV8(isolate->GetCurrentContext(), input);
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if (maybe.IsEmpty())
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return false;
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*output = maybe.ToLocalChecked();
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return true;
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}
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};
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template <typename T>
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struct ToV8Traits<T, false> {
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static bool TryConvertToV8(v8::Isolate* isolate,
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const T& input,
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v8::Local<v8::Value>* output) {
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*output = ConvertToV8(isolate, input);
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return true;
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}
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};
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template <typename T>
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bool TryConvertToV8(v8::Isolate* isolate,
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T input,
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v8::Local<v8::Value>* output) {
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return ToV8Traits<T>::TryConvertToV8(isolate, input, output);
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}
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inline v8::Local<v8::String> StringToV8(
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v8::Isolate* isolate,
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const base::StringPiece& input) {
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return ConvertToV8(isolate, input).As<v8::String>();
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}
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v8::Local<v8::String> StringToSymbol(v8::Isolate* isolate,
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const base::StringPiece& input);
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template<typename T>
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bool ConvertFromV8(v8::Isolate* isolate, v8::Local<v8::Value> input,
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T* result) {
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return Converter<T>::FromV8(isolate, input, result);
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}
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std::string V8ToString(v8::Local<v8::Value> value);
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} // namespace mate
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#endif // NATIVE_MATE_CONVERTER_H_
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