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// ArduinoJson - arduinojson.org
// Copyright Benoit Blanchon 2014-2018
// MIT License
#pragma once
#include <stddef.h>
#include <stdint.h> // for uint8_t
#include "Data/JsonVariantContent.hpp"
#include "Data/JsonVariantDefault.hpp"
#include "Data/JsonVariantType.hpp"
#include "JsonVariantBase.hpp"
#include "RawJson.hpp"
#include "Serialization/JsonPrintable.hpp"
#include "TypeTraits/EnableIf.hpp"
#include "TypeTraits/IsChar.hpp"
#include "TypeTraits/IsFloatingPoint.hpp"
#include "TypeTraits/IsIntegral.hpp"
#include "TypeTraits/IsSame.hpp"
#include "TypeTraits/IsSignedIntegral.hpp"
#include "TypeTraits/IsUnsignedIntegral.hpp"
#include "TypeTraits/RemoveConst.hpp"
#include "TypeTraits/RemoveReference.hpp"
namespace ArduinoJson {
// Forward declarations.
class JsonArray;
class JsonObject;
// A variant that can be a any value serializable to a JSON value.
//
// It can be set to:
// - a boolean
// - a char, short, int or a long (signed or unsigned)
// - a string (const char*)
// - a reference to a JsonArray or JsonObject
class JsonVariant : public Internals::JsonVariantBase<JsonVariant> {
template <typename Print>
friend class Internals::JsonSerializer;
public:
// Creates an uninitialized JsonVariant
JsonVariant() : _type(Internals::JSON_UNDEFINED) {}
// Create a JsonVariant containing a boolean value.
// It will be serialized as "true" or "false" in JSON.
JsonVariant(bool value) {
using namespace Internals;
_type = JSON_BOOLEAN;
_content.asInteger = static_cast<JsonUInt>(value);
}
// Create a JsonVariant containing a floating point value.
// JsonVariant(double value);
// JsonVariant(float value);
template <typename T>
JsonVariant(T value, typename Internals::EnableIf<
Internals::IsFloatingPoint<T>::value>::type * = 0) {
using namespace Internals;
_type = JSON_FLOAT;
_content.asFloat = static_cast<JsonFloat>(value);
}
template <typename T>
DEPRECATED("Second argument is not supported anymore")
JsonVariant(T value, uint8_t,
typename Internals::EnableIf<
Internals::IsFloatingPoint<T>::value>::type * = 0) {
using namespace Internals;
_type = JSON_FLOAT;
_content.asFloat = static_cast<JsonFloat>(value);
}
// Create a JsonVariant containing an integer value.
// JsonVariant(char)
// JsonVariant(signed short)
// JsonVariant(signed int)
// JsonVariant(signed long)
// JsonVariant(signed char)
template <typename T>
JsonVariant(
T value,
typename Internals::EnableIf<Internals::IsSignedIntegral<T>::value ||
Internals::IsSame<T, char>::value>::type * =
0) {
using namespace Internals;
if (value >= 0) {
_type = JSON_POSITIVE_INTEGER;
_content.asInteger = static_cast<JsonUInt>(value);
} else {
_type = JSON_NEGATIVE_INTEGER;
_content.asInteger = static_cast<JsonUInt>(-value);
}
}
// JsonVariant(unsigned short)
// JsonVariant(unsigned int)
// JsonVariant(unsigned long)
template <typename T>
JsonVariant(T value,
typename Internals::EnableIf<
Internals::IsUnsignedIntegral<T>::value>::type * = 0) {
using namespace Internals;
_type = JSON_POSITIVE_INTEGER;
_content.asInteger = static_cast<JsonUInt>(value);
}
// Create a JsonVariant containing a string.
// JsonVariant(const char*);
// JsonVariant(const signed char*);
// JsonVariant(const unsigned char*);
template <typename TChar>
JsonVariant(
const TChar *value,
typename Internals::EnableIf<Internals::IsChar<TChar>::value>::type * =
0) {
_type = Internals::JSON_STRING;
_content.asString = reinterpret_cast<const char *>(value);
}
// Create a JsonVariant containing an unparsed string
JsonVariant(Internals::RawJsonString<const char *> value) {
_type = Internals::JSON_UNPARSED;
_content.asString = value;
}
// Create a JsonVariant containing a reference to an array.
// CAUTION: we are lying about constness, because the array can be modified if
// the variant is converted back to a JsonArray&
JsonVariant(const JsonArray &array);
// Create a JsonVariant containing a reference to an object.
// CAUTION: we are lying about constness, because the object can be modified
// if the variant is converted back to a JsonObject&
JsonVariant(const JsonObject &object);
// Get the variant as the specified type.
//
// char as<char>() const;
// signed char as<signed char>() const;
// signed short as<signed short>() const;
// signed int as<signed int>() const;
// signed long as<signed long>() const;
// unsigned char as<unsigned char>() const;
// unsigned short as<unsigned short>() const;
// unsigned int as<unsigned int>() const;
// unsigned long as<unsigned long>() const;
template <typename T>
const typename Internals::EnableIf<Internals::IsIntegral<T>::value, T>::type
as() const {
return variantAsInteger<T>();
}
// bool as<bool>() const
template <typename T>
const typename Internals::EnableIf<Internals::IsSame<T, bool>::value, T>::type
as() const {
return variantAsInteger<int>() != 0;
}
//
// double as<double>() const;
// float as<float>() const;
template <typename T>
const typename Internals::EnableIf<Internals::IsFloatingPoint<T>::value,
T>::type
as() const {
return variantAsFloat<T>();
}
//
// const char* as<const char*>() const;
// const char* as<char*>() const;
template <typename T>
typename Internals::EnableIf<Internals::IsSame<T, const char *>::value ||
Internals::IsSame<T, char *>::value,
const char *>::type
as() const {
return variantAsString();
}
//
// std::string as<std::string>() const;
// String as<String>() const;
template <typename T>
typename Internals::EnableIf<Internals::StringTraits<T>::has_append, T>::type
as() const {
const char *cstr = variantAsString();
if (cstr) return T(cstr);
T s;
printTo(s);
return s;
}
//
// JsonArray& as<JsonArray> const;
// JsonArray& as<JsonArray&> const;
template <typename T>
typename Internals::EnableIf<
Internals::IsSame<typename Internals::RemoveReference<T>::type,
JsonArray>::value,
JsonArray &>::type
as() const {
return variantAsArray();
}
//
// const JsonArray& as<const JsonArray&> const;
template <typename T>
typename Internals::EnableIf<
Internals::IsSame<typename Internals::RemoveReference<T>::type,
const JsonArray>::value,
const JsonArray &>::type
as() const {
return variantAsArray();
}
//
// JsonObject& as<JsonObject> const;
// JsonObject& as<JsonObject&> const;
template <typename T>
typename Internals::EnableIf<
Internals::IsSame<typename Internals::RemoveReference<T>::type,
JsonObject>::value,
JsonObject &>::type
as() const {
return variantAsObject();
}
//
// JsonObject& as<const JsonObject> const;
// JsonObject& as<const JsonObject&> const;
template <typename T>
typename Internals::EnableIf<
Internals::IsSame<typename Internals::RemoveReference<T>::type,
const JsonObject>::value,
const JsonObject &>::type
as() const {
return variantAsObject();
}
//
// JsonVariant as<JsonVariant> const;
template <typename T>
typename Internals::EnableIf<Internals::IsSame<T, JsonVariant>::value,
T>::type
as() const {
return *this;
}
// Tells weither the variant has the specified type.
// Returns true if the variant has type type T, false otherwise.
//
// bool is<char>() const;
// bool is<signed char>() const;
// bool is<signed short>() const;
// bool is<signed int>() const;
// bool is<signed long>() const;
// bool is<unsigned char>() const;
// bool is<unsigned short>() const;
// bool is<unsigned int>() const;
// bool is<unsigned long>() const;
template <typename T>
typename Internals::EnableIf<Internals::IsIntegral<T>::value, bool>::type is()
const {
return variantIsInteger();
}
//
// bool is<double>() const;
// bool is<float>() const;
template <typename T>
typename Internals::EnableIf<Internals::IsFloatingPoint<T>::value, bool>::type
is() const {
return variantIsFloat();
}
//
// bool is<bool>() const
template <typename T>
typename Internals::EnableIf<Internals::IsSame<T, bool>::value, bool>::type
is() const {
return variantIsBoolean();
}
//
// bool is<const char*>() const;
// bool is<char*>() const;
template <typename T>
typename Internals::EnableIf<Internals::IsSame<T, const char *>::value ||
Internals::IsSame<T, char *>::value,
bool>::type
is() const {
return variantIsString();
}
//
// bool is<JsonArray> const;
// bool is<JsonArray&> const;
// bool is<const JsonArray&> const;
template <typename T>
typename Internals::EnableIf<
Internals::IsSame<typename Internals::RemoveConst<
typename Internals::RemoveReference<T>::type>::type,
JsonArray>::value,
bool>::type
is() const {
return variantIsArray();
}
//
// bool is<JsonObject> const;
// bool is<JsonObject&> const;
// bool is<const JsonObject&> const;
template <typename T>
typename Internals::EnableIf<
Internals::IsSame<typename Internals::RemoveConst<
typename Internals::RemoveReference<T>::type>::type,
JsonObject>::value,
bool>::type
is() const {
return variantIsObject();
}
// Returns true if the variant has a value
bool success() const {
return _type != Internals::JSON_UNDEFINED;
}
private:
JsonArray &variantAsArray() const;
JsonObject &variantAsObject() const;
const char *variantAsString() const;
template <typename T>
T variantAsFloat() const;
template <typename T>
T variantAsInteger() const;
bool variantIsBoolean() const;
bool variantIsFloat() const;
bool variantIsInteger() const;
bool variantIsArray() const {
return _type == Internals::JSON_ARRAY;
}
bool variantIsObject() const {
return _type == Internals::JSON_OBJECT;
}
bool variantIsString() const {
return _type == Internals::JSON_STRING ||
(_type == Internals::JSON_UNPARSED && _content.asString &&
!strcmp("null", _content.asString));
}
// The current type of the variant
Internals::JsonVariantType _type;
// The various alternatives for the value of the variant.
Internals::JsonVariantContent _content;
};
DEPRECATED("Decimal places are ignored, use the float value instead")
inline JsonVariant float_with_n_digits(float value, uint8_t) {
return JsonVariant(value);
}
DEPRECATED("Decimal places are ignored, use the double value instead")
inline JsonVariant double_with_n_digits(double value, uint8_t) {
return JsonVariant(value);
}
}
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