mirror of
https://github.com/eledio-devices/thirdparty-ArduinoJson.git
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356 lines
11 KiB
C++
356 lines
11 KiB
C++
// Copyright Benoit Blanchon 2014-2017
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// MIT License
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//
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// Arduino JSON library
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// https://github.com/bblanchon/ArduinoJson
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// If you like this project, please add a star!
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#pragma once
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#include <stddef.h>
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#include <stdint.h> // for uint8_t
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#include "Data/JsonVariantContent.hpp"
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#include "Data/JsonVariantDefault.hpp"
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#include "Data/JsonVariantType.hpp"
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#include "JsonVariantBase.hpp"
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#include "RawJson.hpp"
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#include "Serialization/JsonPrintable.hpp"
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#include "TypeTraits/EnableIf.hpp"
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#include "TypeTraits/IsFloatingPoint.hpp"
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#include "TypeTraits/IsIntegral.hpp"
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#include "TypeTraits/IsSame.hpp"
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#include "TypeTraits/IsSignedIntegral.hpp"
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#include "TypeTraits/IsUnsignedIntegral.hpp"
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#include "TypeTraits/RemoveConst.hpp"
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#include "TypeTraits/RemoveReference.hpp"
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namespace ArduinoJson {
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// Forward declarations.
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class JsonArray;
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class JsonObject;
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// A variant that can be a any value serializable to a JSON value.
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//
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// It can be set to:
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// - a boolean
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// - a char, short, int or a long (signed or unsigned)
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// - a string (const char*)
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// - a reference to a JsonArray or JsonObject
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class JsonVariant : public JsonVariantBase<JsonVariant> {
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friend void Internals::JsonSerializer::serialize(const JsonVariant &,
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JsonWriter &);
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public:
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// Creates an uninitialized JsonVariant
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JsonVariant() : _type(Internals::JSON_UNDEFINED) {}
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// Create a JsonVariant containing a boolean value.
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// It will be serialized as "true" or "false" in JSON.
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JsonVariant(bool value) {
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using namespace Internals;
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_type = JSON_BOOLEAN;
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_content.asInteger = static_cast<JsonInteger>(value);
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}
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// Create a JsonVariant containing a floating point value.
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// The second argument specifies the number of decimal digits to write in
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// the JSON string.
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// JsonVariant(double value, uint8_t decimals);
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// JsonVariant(float value, uint8_t decimals);
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template <typename T>
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JsonVariant(T value, uint8_t decimals = 2,
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typename TypeTraits::EnableIf<
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TypeTraits::IsFloatingPoint<T>::value>::type * = 0) {
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using namespace Internals;
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_type = static_cast<JsonVariantType>(JSON_FLOAT_0_DECIMALS + decimals);
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_content.asFloat = static_cast<JsonFloat>(value);
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}
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// Create a JsonVariant containing an integer value.
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// JsonVariant(signed short)
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// JsonVariant(signed int)
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// JsonVariant(signed long)
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template <typename T>
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JsonVariant(T value,
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typename TypeTraits::EnableIf<
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TypeTraits::IsSignedIntegral<T>::value>::type * = 0) {
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using namespace Internals;
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if (value >= 0) {
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_type = JSON_POSITIVE_INTEGER;
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_content.asInteger = static_cast<JsonUInt>(value);
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} else {
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_type = JSON_NEGATIVE_INTEGER;
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_content.asInteger = static_cast<JsonUInt>(-value);
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}
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}
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// JsonVariant(unsigned short)
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// JsonVariant(unsigned int)
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// JsonVariant(unsigned long)
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template <typename T>
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JsonVariant(T value,
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typename TypeTraits::EnableIf<
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TypeTraits::IsUnsignedIntegral<T>::value>::type * = 0) {
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using namespace Internals;
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_type = JSON_POSITIVE_INTEGER;
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_content.asInteger = static_cast<JsonUInt>(value);
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}
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// Create a JsonVariant containing a string.
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JsonVariant(const char *value) {
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_type = Internals::JSON_STRING;
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_content.asString = value;
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}
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// Create a JsonVariant containing an unparsed string
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JsonVariant(RawJson value) {
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_type = Internals::JSON_UNPARSED;
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_content.asString = value;
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}
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// Create a JsonVariant containing a reference to an array.
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// CAUTION: we are lying about constness, because the array can be modified if
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// the variant is converted back to a JsonArray&
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JsonVariant(const JsonArray &array);
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// Create a JsonVariant containing a reference to an object.
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// CAUTION: we are lying about constness, because the object can be modified
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// if the variant is converted back to a JsonObject&
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JsonVariant(const JsonObject &object);
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// Get the variant as the specified type.
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//
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// short as<signed short>() const;
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// int as<signed int>() const;
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// long as<signed long>() const;
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template <typename T>
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const typename TypeTraits::EnableIf<TypeTraits::IsSignedIntegral<T>::value,
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T>::type
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as() const {
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return static_cast<T>(asInteger());
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}
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//
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// short as<unsigned short>() const;
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// int as<unsigned int>() const;
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// long as<unsigned long>() const;
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template <typename T>
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const typename TypeTraits::EnableIf<TypeTraits::IsUnsignedIntegral<T>::value,
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T>::type
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as() const {
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return static_cast<T>(asUnsignedInteger());
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}
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//
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// double as<double>() const;
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// float as<float>() const;
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template <typename T>
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const typename TypeTraits::EnableIf<TypeTraits::IsFloatingPoint<T>::value,
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T>::type
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as() const {
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return static_cast<T>(asFloat());
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}
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//
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// const char* as<const char*>() const;
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// const char* as<char*>() const;
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template <typename T>
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typename TypeTraits::EnableIf<TypeTraits::IsSame<T, const char *>::value ||
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TypeTraits::IsSame<T, char *>::value,
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const char *>::type
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as() const {
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return asString();
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}
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//
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// std::string as<std::string>() const;
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// String as<String>() const;
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template <typename T>
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typename TypeTraits::EnableIf<Internals::StringFuncs<T>::has_append, T>::type
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as() const {
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const char *cstr = asString();
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if (cstr) return T(cstr);
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T s;
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printTo(s);
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return s;
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}
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//
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// const bool as<bool>() const
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template <typename T>
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const typename TypeTraits::EnableIf<TypeTraits::IsSame<T, bool>::value,
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T>::type
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as() const {
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return asInteger() != 0;
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}
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//
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// JsonArray& as<JsonArray> const;
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// JsonArray& as<JsonArray&> const;
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template <typename T>
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typename TypeTraits::EnableIf<
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TypeTraits::IsSame<typename TypeTraits::RemoveReference<T>::type,
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JsonArray>::value,
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JsonArray &>::type
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as() const {
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return asArray();
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}
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//
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// const JsonArray& as<const JsonArray&> const;
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template <typename T>
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typename TypeTraits::EnableIf<
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TypeTraits::IsSame<typename TypeTraits::RemoveReference<T>::type,
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const JsonArray>::value,
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const JsonArray &>::type
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as() const {
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return asArray();
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}
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//
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// JsonObject& as<JsonObject> const;
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// JsonObject& as<JsonObject&> const;
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template <typename T>
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typename TypeTraits::EnableIf<
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TypeTraits::IsSame<typename TypeTraits::RemoveReference<T>::type,
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JsonObject>::value,
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JsonObject &>::type
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as() const {
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return asObject();
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}
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//
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// JsonObject& as<const JsonObject> const;
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// JsonObject& as<const JsonObject&> const;
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template <typename T>
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typename TypeTraits::EnableIf<
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TypeTraits::IsSame<typename TypeTraits::RemoveReference<T>::type,
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const JsonObject>::value,
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const JsonObject &>::type
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as() const {
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return asObject();
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}
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//
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// JsonVariant as<JsonVariant> const;
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template <typename T>
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typename TypeTraits::EnableIf<TypeTraits::IsSame<T, JsonVariant>::value,
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T>::type
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as() const {
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return *this;
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}
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// Tells weither the variant has the specified type.
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// Returns true if the variant has type type T, false otherwise.
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//
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// short as<short>() const;
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// int as<int>() const;
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// long as<long>() const;
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template <typename T>
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const typename TypeTraits::EnableIf<TypeTraits::IsIntegral<T>::value &&
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!TypeTraits::IsSame<T, bool>::value,
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bool>::type
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is() const {
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return isInteger();
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}
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//
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// double is<double>() const;
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// float is<float>() const;
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template <typename T>
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const typename TypeTraits::EnableIf<TypeTraits::IsFloatingPoint<T>::value,
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bool>::type
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is() const {
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return isFloat();
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}
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//
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// const bool is<bool>() const
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template <typename T>
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const typename TypeTraits::EnableIf<TypeTraits::IsSame<T, bool>::value,
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bool>::type
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is() const {
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return isBoolean();
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}
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//
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// bool is<const char*>() const;
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// bool is<char*>() const;
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template <typename T>
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typename TypeTraits::EnableIf<TypeTraits::IsSame<T, const char *>::value ||
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TypeTraits::IsSame<T, char *>::value,
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bool>::type
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is() const {
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return isString();
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}
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//
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// bool is<JsonArray> const;
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// bool is<JsonArray&> const;
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// bool is<const JsonArray&> const;
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template <typename T>
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typename TypeTraits::EnableIf<
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TypeTraits::IsSame<
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typename TypeTraits::RemoveConst<
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typename TypeTraits::RemoveReference<T>::type>::type,
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JsonArray>::value,
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bool>::type
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is() const {
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return isArray();
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}
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//
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// bool is<JsonObject> const;
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// bool is<JsonObject&> const;
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// bool is<const JsonObject&> const;
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template <typename T>
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typename TypeTraits::EnableIf<
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TypeTraits::IsSame<
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typename TypeTraits::RemoveConst<
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typename TypeTraits::RemoveReference<T>::type>::type,
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JsonObject>::value,
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bool>::type
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is() const {
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return isObject();
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}
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// Returns true if the variant has a value
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bool success() const {
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return _type != Internals::JSON_UNDEFINED;
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}
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// DEPRECATED: use as<char*>() instead
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const char *asString() const;
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// DEPRECATED: use as<JsonArray>() instead
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JsonArray &asArray() const;
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// DEPRECATED: use as<JsonObject>() instead
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JsonObject &asObject() const;
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private:
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// It's not allowed to store a char
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template <typename T>
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JsonVariant(T value, typename TypeTraits::EnableIf<
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TypeTraits::IsSame<T, char>::value>::type * = 0);
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Internals::JsonFloat asFloat() const;
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Internals::JsonInteger asInteger() const;
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Internals::JsonUInt asUnsignedInteger() const;
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bool isBoolean() const;
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bool isFloat() const;
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bool isInteger() const;
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bool isArray() const {
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return _type == Internals::JSON_ARRAY;
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}
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bool isObject() const {
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return _type == Internals::JSON_OBJECT;
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}
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bool isString() const {
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return _type == Internals::JSON_STRING ||
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(_type == Internals::JSON_UNPARSED && _content.asString &&
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!strcmp("null", _content.asString));
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}
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// The current type of the variant
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Internals::JsonVariantType _type;
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// The various alternatives for the value of the variant.
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Internals::JsonVariantContent _content;
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};
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inline JsonVariant float_with_n_digits(float value, uint8_t digits) {
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return JsonVariant(value, digits);
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}
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inline JsonVariant double_with_n_digits(double value, uint8_t digits) {
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return JsonVariant(value, digits);
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}
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}
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