mirror of
https://github.com/eledio-devices/thirdparty-ArduinoJson.git
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325 lines
9.6 KiB
C++
325 lines
9.6 KiB
C++
// ArduinoJson - arduinojson.org
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// Copyright Benoit Blanchon 2014-2018
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// MIT License
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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 "Polyfills/type_traits.hpp"
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#include "RawJson.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 Internals::JsonVariantBase<JsonVariant> {
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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<JsonUInt>(value);
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}
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// Create a JsonVariant containing a floating point value.
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// JsonVariant(double value);
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// JsonVariant(float value);
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template <typename T>
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JsonVariant(T value,
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typename Internals::enable_if<
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Internals::is_floating_point<T>::value>::type * = 0) {
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using namespace Internals;
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_type = JSON_FLOAT;
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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(char)
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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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// JsonVariant(signed char)
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template <typename T>
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JsonVariant(
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T value,
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typename Internals::enable_if<Internals::is_integral<T>::value &&
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Internals::is_signed<T>::value>::type * =
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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) + 1;
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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(
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T value,
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typename Internals::enable_if<Internals::is_integral<T>::value &&
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Internals::is_unsigned<T>::value>::type * =
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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*);
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// JsonVariant(const signed char*);
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// JsonVariant(const unsigned char*);
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template <typename TChar>
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JsonVariant(const TChar *value,
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typename Internals::enable_if<sizeof(TChar) == 1>::type * = 0) {
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_type = Internals::JSON_STRING;
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_content.asString = reinterpret_cast<const char *>(value);
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}
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// Create a JsonVariant containing an unparsed string
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JsonVariant(Internals::RawJsonString<const char *> value) {
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_type = Internals::JSON_UNPARSED;
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_content.asString = value;
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}
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JsonVariant(JsonArray array);
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JsonVariant(JsonObject object);
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// Get the variant as the specified type.
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//
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// char as<char>() const;
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// signed char as<signed char>() const;
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// signed short as<signed short>() const;
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// signed int as<signed int>() const;
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// signed long as<signed long>() const;
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// unsigned char as<unsigned char>() const;
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// unsigned short as<unsigned short>() const;
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// unsigned int as<unsigned int>() const;
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// unsigned long as<unsigned long>() const;
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template <typename T>
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const typename Internals::enable_if<Internals::is_integral<T>::value, T>::type
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as() const {
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return variantAsInteger<T>();
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}
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// bool as<bool>() const
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template <typename T>
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const typename Internals::enable_if<Internals::is_same<T, bool>::value,
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T>::type
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as() const {
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return variantAsInteger<int>() != 0;
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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 Internals::enable_if<Internals::is_floating_point<T>::value,
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T>::type
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as() const {
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return variantAsFloat<T>();
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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 Internals::enable_if<Internals::is_same<T, const char *>::value ||
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Internals::is_same<T, char *>::value,
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const char *>::type
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as() const {
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return variantAsString();
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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 Internals::enable_if<Internals::StringTraits<T>::has_append, T>::type
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as() const {
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const char *cstr = variantAsString();
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if (cstr) return T(cstr);
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T s;
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serializeJson(*this, s);
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return s;
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}
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//
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// JsonArray as<JsonArray>() const;
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// const JsonArray as<const JsonArray>() const;
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template <typename T>
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typename Internals::enable_if<
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Internals::is_same<typename Internals::remove_const<T>::type,
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JsonArray>::value,
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JsonArray>::type
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as() const;
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//
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// JsonObject as<JsonObject>() const;
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// const JsonObject as<const JsonObject>() const;
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template <typename T>
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typename Internals::enable_if<
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Internals::is_same<typename Internals::remove_const<T>::type,
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JsonObject>::value,
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T>::type
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as() const;
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//
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// JsonVariant as<JsonVariant> const;
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template <typename T>
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typename Internals::enable_if<Internals::is_same<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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// bool is<char>() const;
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// bool is<signed char>() const;
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// bool is<signed short>() const;
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// bool is<signed int>() const;
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// bool is<signed long>() const;
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// bool is<unsigned char>() const;
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// bool is<unsigned short>() const;
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// bool is<unsigned int>() const;
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// bool is<unsigned long>() const;
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template <typename T>
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typename Internals::enable_if<Internals::is_integral<T>::value, bool>::type
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is() const {
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return variantIsInteger();
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}
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//
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// bool is<double>() const;
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// bool is<float>() const;
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template <typename T>
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typename Internals::enable_if<Internals::is_floating_point<T>::value,
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bool>::type
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is() const {
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return variantIsFloat();
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}
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//
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// bool is<bool>() const
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template <typename T>
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typename Internals::enable_if<Internals::is_same<T, bool>::value, bool>::type
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is() const {
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return variantIsBoolean();
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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 Internals::enable_if<Internals::is_same<T, const char *>::value ||
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Internals::is_same<T, char *>::value,
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bool>::type
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is() const {
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return variantIsString();
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}
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//
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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 Internals::enable_if<
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Internals::is_same<typename Internals::remove_const<T>::type,
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JsonArray>::value,
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bool>::type
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is() const {
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return variantIsArray();
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}
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//
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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 Internals::enable_if<
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Internals::is_same<typename Internals::remove_const<T>::type,
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JsonObject>::value,
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bool>::type
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is() const {
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return variantIsObject();
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}
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// Returns true if the variant has a value
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bool isNull() const {
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return _type == Internals::JSON_UNDEFINED;
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}
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template <typename Visitor>
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void visit(Visitor &visitor) const {
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using namespace Internals;
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switch (_type) {
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case JSON_FLOAT:
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return visitor.acceptFloat(_content.asFloat);
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case JSON_ARRAY:
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return visitor.acceptArray(_content.asArray);
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case JSON_OBJECT:
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return visitor.acceptObject(_content.asObject);
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case JSON_STRING:
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return visitor.acceptString(_content.asString);
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case JSON_UNPARSED:
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return visitor.acceptRawJson(_content.asString);
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case JSON_NEGATIVE_INTEGER:
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return visitor.acceptNegativeInteger(_content.asInteger);
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case JSON_POSITIVE_INTEGER:
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return visitor.acceptPositiveInteger(_content.asInteger);
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case JSON_BOOLEAN:
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return visitor.acceptBoolean(_content.asInteger != 0);
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default: // JSON_UNDEFINED
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return visitor.acceptNull();
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}
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}
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private:
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JsonArray variantAsArray() const;
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JsonObject variantAsObject() const;
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const char *variantAsString() const;
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template <typename T>
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T variantAsFloat() const;
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template <typename T>
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T variantAsInteger() const;
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bool variantIsBoolean() const;
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bool variantIsFloat() const;
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bool variantIsInteger() const;
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bool variantIsArray() const {
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return _type == Internals::JSON_ARRAY;
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}
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bool variantIsObject() const {
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return _type == Internals::JSON_OBJECT;
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}
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bool variantIsString() 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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} // namespace ArduinoJson
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