mirror of
https://github.com/eledio-devices/thirdparty-ArduinoJson.git
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269 lines
8.0 KiB
C++
269 lines
8.0 KiB
C++
// Copyright Benoit Blanchon 2014-2016
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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 "Internals/JsonBufferAllocated.hpp"
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#include "Internals/JsonPrintable.hpp"
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#include "Internals/List.hpp"
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#include "Internals/ReferenceType.hpp"
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#include "JsonVariant.hpp"
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#include "TypeTraits/EnableIf.hpp"
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#include "TypeTraits/IsFloatingPoint.hpp"
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#include "TypeTraits/IsReference.hpp"
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#include "TypeTraits/IsSame.hpp"
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// Returns the size (in bytes) of an array with n elements.
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// Can be very handy to determine the size of a StaticJsonBuffer.
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#define JSON_ARRAY_SIZE(NUMBER_OF_ELEMENTS) \
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(sizeof(JsonArray) + (NUMBER_OF_ELEMENTS) * sizeof(JsonArray::node_type))
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namespace ArduinoJson {
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// Forward declarations
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class JsonObject;
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class JsonBuffer;
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class JsonArraySubscript;
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// An array of JsonVariant.
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//
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// The constructor is private, instances must be created via
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// JsonBuffer::createArray() or JsonBuffer::parseArray().
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// A JsonArray can be serialized to a JSON string via JsonArray::printTo().
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// It can also be deserialized from a JSON string via JsonBuffer::parseArray().
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class JsonArray : public Internals::JsonPrintable<JsonArray>,
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public Internals::ReferenceType,
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public Internals::List<JsonVariant>,
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public Internals::JsonBufferAllocated {
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public:
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// A meta-function that returns true if type T can be used in
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// JsonArray::set()
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template <typename T>
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struct CanSet {
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static const bool value = JsonVariant::IsConstructibleFrom<T>::value ||
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TypeTraits::IsSame<T, String &>::value ||
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TypeTraits::IsSame<T, const String &>::value;
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};
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// Create an empty JsonArray attached to the specified JsonBuffer.
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// You should not call this constructor directly.
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// Instead, use JsonBuffer::createArray() or JsonBuffer::parseArray().
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explicit JsonArray(JsonBuffer *buffer)
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: Internals::List<JsonVariant>(buffer) {}
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// Gets the value at the specified index
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JsonVariant operator[](size_t index) const {
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return get(index);
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}
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// Gets or sets the value at specified index
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JsonArraySubscript operator[](size_t index);
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// Adds the specified value at the end of the array.
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//
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// bool add(bool);
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// bool add(char);
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// bool add(long);
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// bool add(int);
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// bool add(short);
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// bool add(float value);
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// bool add(double value);
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// bool add(const char*);
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template <typename T>
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bool add(
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T value,
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typename TypeTraits::EnableIf<
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CanSet<T>::value && !TypeTraits::IsReference<T>::value>::type * = 0) {
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return addNode<T>(value);
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}
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// bool add(const String&)
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// bool add(const JsonVariant&);
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// bool add(JsonArray&);
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// bool add(JsonObject&);
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template <typename T>
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bool add(const T &value,
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typename TypeTraits::EnableIf<CanSet<T &>::value>::type * = 0) {
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return addNode<T &>(const_cast<T &>(value));
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}
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// bool add(float value, uint8_t decimals);
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// bool add(double value, uint8_t decimals);
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template <typename T>
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bool add(T value, uint8_t decimals,
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typename TypeTraits::EnableIf<
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TypeTraits::IsFloatingPoint<T>::value>::type * = 0) {
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return addNode<JsonVariant>(JsonVariant(value, decimals));
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}
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// Sets the value at specified index.
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//
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// bool set(size_t index, bool value);
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// bool set(size_t index, long value);
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// bool set(size_t index, int value);
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// bool set(size_t index, short value);
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template <typename T>
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bool set(
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size_t index, T value,
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typename TypeTraits::EnableIf<
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CanSet<T>::value && !TypeTraits::IsReference<T>::value>::type * = 0) {
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return setNodeAt<T>(index, value);
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}
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// bool set(size_t index, const String&)
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// bool set(size_t index, const JsonVariant&);
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// bool set(size_t index, JsonArray&);
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// bool set(size_t index, JsonObject&);
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template <typename T>
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bool set(size_t index, const T &value,
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typename TypeTraits::EnableIf<CanSet<T &>::value>::type * = 0) {
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return setNodeAt<T &>(index, const_cast<T &>(value));
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}
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// bool set(size_t index, float value, uint8_t decimals = 2);
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// bool set(size_t index, double value, uint8_t decimals = 2);
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template <typename T>
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bool set(size_t index, T value, uint8_t decimals,
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typename TypeTraits::EnableIf<
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TypeTraits::IsFloatingPoint<T>::value>::type * = 0) {
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return setNodeAt<const JsonVariant &>(index, JsonVariant(value, decimals));
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}
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// Gets the value at the specified index.
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JsonVariant get(size_t index) const {
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node_type *node = getNodeAt(index);
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return node ? node->content : JsonVariant();
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}
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// Gets the value at the specified index.
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template <typename T>
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T get(size_t index) const {
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node_type *node = getNodeAt(index);
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return node ? node->content.as<T>() : JsonVariant::defaultValue<T>();
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}
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// Check the type of the value at specified index.
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template <typename T>
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bool is(size_t index) const {
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node_type *node = getNodeAt(index);
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return node ? node->content.is<T>() : false;
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}
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// Creates a JsonArray and adds a reference at the end of the array.
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// It's a shortcut for JsonBuffer::createArray() and JsonArray::add()
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JsonArray &createNestedArray();
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// Creates a JsonObject and adds a reference at the end of the array.
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// It's a shortcut for JsonBuffer::createObject() and JsonArray::add()
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JsonObject &createNestedObject();
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// Removes element at specified index.
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void removeAt(size_t index) {
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removeNode(getNodeAt(index));
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}
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// Returns a reference an invalid JsonArray.
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// This object is meant to replace a NULL pointer.
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// This is used when memory allocation or JSON parsing fail.
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static JsonArray &invalid() {
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static JsonArray instance(NULL);
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return instance;
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}
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// Serialize the array to the specified JsonWriter.
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void writeTo(Internals::JsonWriter &writer) const {
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writer.beginArray();
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const node_type *child = _firstNode;
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while (child) {
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child->content.writeTo(writer);
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child = child->next;
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if (!child) break;
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writer.writeComma();
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}
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writer.endArray();
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}
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// Imports a 1D array
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template <typename T, size_t N>
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bool copyFrom(T(&array)[N]) {
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return copyFrom(array, N);
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}
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// Imports a 1D array
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template <typename T>
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bool copyFrom(T *array, size_t len) {
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bool ok = true;
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for (size_t i = 0; i < len; i++) {
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ok &= add(array[i]);
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}
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return ok;
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}
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// Imports a 2D array
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template <typename T, size_t N1, size_t N2>
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bool copyFrom(T(&array)[N1][N2]) {
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bool ok = true;
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for (size_t i = 0; i < N1; i++) {
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JsonArray &nestedArray = createNestedArray();
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for (size_t j = 0; j < N2; j++) {
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ok &= nestedArray.add(array[i][j]);
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}
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}
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return ok;
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}
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// Exports a 1D array
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template <typename T, size_t N>
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size_t copyTo(T(&array)[N]) const {
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return copyTo(array, N);
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}
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// Exports a 1D array
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template <typename T>
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size_t copyTo(T *array, size_t len) const {
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size_t i = 0;
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for (const_iterator it = begin(); it != end() && i < len; ++it)
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array[i++] = *it;
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return i;
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}
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// Exports a 2D array
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template <typename T, size_t N1, size_t N2>
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void copyTo(T(&array)[N1][N2]) const {
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size_t i = 0;
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for (const_iterator it = begin(); it != end() && i < N1; ++it) {
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it->asArray().copyTo(array[i++]);
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}
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}
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private:
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node_type *getNodeAt(size_t index) const {
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node_type *node = _firstNode;
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while (node && index--) node = node->next;
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return node;
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}
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template <typename TValue>
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bool setNodeAt(size_t index, TValue value) {
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node_type *node = getNodeAt(index);
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return node != NULL && setNodeValue<TValue>(node, value);
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}
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template <typename TValue>
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bool addNode(TValue value) {
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node_type *node = addNewNode();
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return node != NULL && setNodeValue<TValue>(node, value);
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}
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template <typename T>
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bool setNodeValue(node_type *node, T value) {
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node->content = value;
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return true;
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}
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};
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}
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