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// ArduinoJson - https://arduinojson.org
// Copyright Benoit Blanchon 2014-2021
// MIT License
#pragma once
#include <ArduinoJson/Strings/IsWriteableString.hpp>
#include <ArduinoJson/Variant/VariantFunctions.hpp>
#include <ArduinoJson/Variant/VariantRef.hpp>
namespace ARDUINOJSON_NAMESPACE {
template <typename T, typename Enable>
struct Converter {
static bool toJson(const T& src, VariantRef dst) {
// clang-format off
return convertToJson(src, dst); // Error here? See https://arduinojson.org/v6/unsupported-set/
// clang-format on
}
static T fromJson(VariantConstRef src) {
// clang-format off
T result; // Error here? See https://arduinojson.org/v6/non-default-constructible/
convertFromJson(src, result); // Error here? See https://arduinojson.org/v6/unsupported-as/
// clang-format on
return result;
}
static bool checkJson(VariantConstRef src) {
T dummy;
// clang-format off
return canConvertFromJson(src, dummy); // Error here? See https://arduinojson.org/v6/unsupported-is/
// clang-format on
}
};
template <typename T>
struct Converter<
T, typename enable_if<is_integral<T>::value && !is_same<bool, T>::value &&
!is_same<char, T>::value>::type> {
static bool toJson(T src, VariantRef dst) {
VariantData* data = getData(dst);
ARDUINOJSON_ASSERT_INTEGER_TYPE_IS_SUPPORTED(T);
if (!data)
return false;
data->setInteger(src);
return true;
}
static T fromJson(VariantConstRef src) {
ARDUINOJSON_ASSERT_INTEGER_TYPE_IS_SUPPORTED(T);
const VariantData* data = getData(src);
return data ? data->asIntegral<T>() : T();
}
static bool checkJson(VariantConstRef src) {
const VariantData* data = getData(src);
return data && data->isInteger<T>();
}
};
template <typename T>
struct Converter<T, typename enable_if<is_enum<T>::value>::type> {
static bool toJson(T src, VariantRef dst) {
return dst.set(static_cast<Integer>(src));
}
static T fromJson(VariantConstRef src) {
const VariantData* data = getData(src);
return data ? static_cast<T>(data->asIntegral<int>()) : T();
}
static bool checkJson(VariantConstRef src) {
const VariantData* data = getData(src);
return data && data->isInteger<int>();
}
};
template <>
struct Converter<bool> {
static bool toJson(bool src, VariantRef dst) {
VariantData* data = getData(dst);
if (!data)
return false;
data->setBoolean(src);
return true;
}
static bool fromJson(VariantConstRef src) {
const VariantData* data = getData(src);
return data ? data->asBoolean() : false;
}
static bool checkJson(VariantConstRef src) {
const VariantData* data = getData(src);
return data && data->isBoolean();
}
};
template <typename T>
struct Converter<T, typename enable_if<is_floating_point<T>::value>::type> {
static bool toJson(T src, VariantRef dst) {
VariantData* data = getData(dst);
if (!data)
return false;
data->setFloat(static_cast<Float>(src));
return true;
}
static T fromJson(VariantConstRef src) {
const VariantData* data = getData(src);
return data ? data->asFloat<T>() : false;
}
static bool checkJson(VariantConstRef src) {
const VariantData* data = getData(src);
return data && data->isFloat();
}
};
template <>
struct Converter<const char*> {
static bool toJson(const char* src, VariantRef dst) {
return variantSetString(getData(dst), adaptString(src), getPool(dst));
}
static const char* fromJson(VariantConstRef src) {
const VariantData* data = getData(src);
return data ? data->asString() : 0;
}
static bool checkJson(VariantConstRef src) {
const VariantData* data = getData(src);
return data && data->isString();
}
};
template <typename T>
inline typename enable_if<IsString<T>::value, bool>::type convertToJson(
const T& src, VariantRef dst) {
VariantData* data = getData(dst);
MemoryPool* pool = getPool(dst);
return variantSetString(data, adaptString(src), pool);
}
template <typename T>
inline typename enable_if<IsWriteableString<T>::value>::type convertFromJson(
VariantConstRef src, T& dst) {
const VariantData* data = getData(src);
const char* cstr = data != 0 ? data->asString() : 0;
if (cstr)
dst = cstr;
else
serializeJson(src, dst);
}
template <typename T>
inline typename enable_if<IsWriteableString<T>::value, bool>::type
canConvertFromJson(VariantConstRef src, const T&) {
const VariantData* data = getData(src);
return data && data->isString();
}
template <>
struct Converter<SerializedValue<const char*> > {
static bool toJson(SerializedValue<const char*> src, VariantRef dst) {
VariantData* data = getData(dst);
if (!data)
return false;
data->setLinkedRaw(src);
return true;
}
};
// SerializedValue<std::string>
// SerializedValue<String>
// SerializedValue<const __FlashStringHelper*>
template <typename T>
struct Converter<SerializedValue<T>,
typename enable_if<!is_same<const char*, T>::value>::type> {
static bool toJson(SerializedValue<T> src, VariantRef dst) {
VariantData* data = getData(dst);
MemoryPool* pool = getPool(dst);
return data != 0 && data->setOwnedRaw(src, pool);
}
};
#if ARDUINOJSON_HAS_NULLPTR
template <>
struct Converter<decltype(nullptr)> {
static bool toJson(decltype(nullptr), VariantRef dst) {
variantSetNull(getData(dst));
return true;
}
static decltype(nullptr) fromJson(VariantConstRef) {
return nullptr;
}
static bool checkJson(VariantConstRef src) {
const VariantData* data = getData(src);
return data == 0 || data->isNull();
}
};
#endif
#if ARDUINOJSON_ENABLE_ARDUINO_STREAM
class MemoryPoolPrint : public Print {
public:
MemoryPoolPrint(MemoryPool* pool) : _pool(pool), _size(0) {
pool->getFreeZone(&_string, &_capacity);
}
const char* c_str() {
_string[_size++] = 0;
ARDUINOJSON_ASSERT(_size <= _capacity);
return _pool->saveStringFromFreeZone(_size);
}
size_t write(uint8_t c) {
if (_size >= _capacity)
return 0;
_string[_size++] = char(c);
return 1;
}
size_t write(const uint8_t* buffer, size_t size) {
if (_size + size >= _capacity) {
_size = _capacity; // mark as overflowed
return 0;
}
memcpy(&_string[_size], buffer, size);
_size += size;
return size;
}
bool overflowed() const {
return _size >= _capacity;
}
private:
MemoryPool* _pool;
size_t _size;
char* _string;
size_t _capacity;
};
inline bool convertToJson(const ::Printable& src, VariantRef dst) {
MemoryPool* pool = getPool(dst);
VariantData* data = getData(dst);
if (!pool || !data)
return false;
MemoryPoolPrint print(pool);
src.printTo(print);
if (print.overflowed()) {
pool->markAsOverflowed();
data->setNull();
return false;
}
data->setStringPointer(print.c_str(), storage_policies::store_by_copy());
return true;
}
#endif
} // namespace ARDUINOJSON_NAMESPACE
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