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// ArduinoJson - https://arduinojson.org
// Copyright Benoit Blanchon 2014-2021
// MIT License
#pragma once
#include <ArduinoJson/Memory/MemoryPool.hpp>
#include <ArduinoJson/Misc/SerializedValue.hpp>
#include <ArduinoJson/Numbers/convertNumber.hpp>
#include <ArduinoJson/Strings/RamStringAdapter.hpp>
#include <ArduinoJson/Variant/VariantContent.hpp>
// VariantData can't have a constructor (to be a POD), so we have no way to fix
// this warning
#if defined(__GNUC__)
#if __GNUC__ >= 7
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
#pragma GCC diagnostic ignored "-Wuninitialized"
#endif
#endif
namespace ARDUINOJSON_NAMESPACE {
class VariantData {
VariantContent _content; // must be first to allow cast from array to variant
uint8_t _flags;
public:
// Must be a POD!
// - no constructor
// - no destructor
// - no virtual
// - no inheritance
void init() {
_flags = 0;
}
template <typename TVisitor>
typename TVisitor::result_type accept(TVisitor &visitor) const {
switch (type()) {
case VALUE_IS_FLOAT:
return visitor.visitFloat(_content.asFloat);
case VALUE_IS_ARRAY:
return visitor.visitArray(_content.asCollection);
case VALUE_IS_OBJECT:
return visitor.visitObject(_content.asCollection);
case VALUE_IS_LINKED_STRING:
case VALUE_IS_OWNED_STRING:
return visitor.visitString(_content.asString);
case VALUE_IS_OWNED_RAW:
case VALUE_IS_LINKED_RAW:
return visitor.visitRawJson(_content.asRaw.data, _content.asRaw.size);
case VALUE_IS_SIGNED_INTEGER:
return visitor.visitSignedInteger(_content.asSignedInteger);
case VALUE_IS_UNSIGNED_INTEGER:
return visitor.visitUnsignedInteger(_content.asUnsignedInteger);
case VALUE_IS_BOOLEAN:
return visitor.visitBoolean(_content.asBoolean != 0);
default:
return visitor.visitNull();
}
}
template <typename T>
T asIntegral() const;
template <typename T>
T asFloat() const;
const char *asString() const;
bool asBoolean() const;
CollectionData *asArray() {
return isArray() ? &_content.asCollection : 0;
}
const CollectionData *asArray() const {
return const_cast<VariantData *>(this)->asArray();
}
CollectionData *asObject() {
return isObject() ? &_content.asCollection : 0;
}
const CollectionData *asObject() const {
return const_cast<VariantData *>(this)->asObject();
}
bool copyFrom(const VariantData &src, MemoryPool *pool) {
switch (src.type()) {
case VALUE_IS_ARRAY:
return toArray().copyFrom(src._content.asCollection, pool);
case VALUE_IS_OBJECT:
return toObject().copyFrom(src._content.asCollection, pool);
case VALUE_IS_OWNED_STRING:
return setString(RamStringAdapter(src._content.asString), pool);
case VALUE_IS_OWNED_RAW:
return setOwnedRaw(
serialized(src._content.asRaw.data, src._content.asRaw.size), pool);
default:
setType(src.type());
_content = src._content;
return true;
}
}
bool isArray() const {
return (_flags & VALUE_IS_ARRAY) != 0;
}
bool isBoolean() const {
return type() == VALUE_IS_BOOLEAN;
}
bool isCollection() const {
return (_flags & COLLECTION_MASK) != 0;
}
template <typename T>
bool isInteger() const {
switch (type()) {
case VALUE_IS_UNSIGNED_INTEGER:
return canConvertNumber<T>(_content.asUnsignedInteger);
case VALUE_IS_SIGNED_INTEGER:
return canConvertNumber<T>(_content.asSignedInteger);
default:
return false;
}
}
bool isFloat() const {
return (_flags & NUMBER_BIT) != 0;
}
bool isString() const {
return type() == VALUE_IS_LINKED_STRING || type() == VALUE_IS_OWNED_STRING;
}
bool isObject() const {
return (_flags & VALUE_IS_OBJECT) != 0;
}
bool isNull() const {
return type() == VALUE_IS_NULL;
}
bool isEnclosed() const {
return !isFloat();
}
void remove(size_t index) {
if (isArray())
_content.asCollection.removeElement(index);
}
template <typename TAdaptedString>
void remove(TAdaptedString key) {
if (isObject())
_content.asCollection.removeMember(key);
}
void setBoolean(bool value) {
setType(VALUE_IS_BOOLEAN);
_content.asBoolean = value;
}
void setFloat(Float value) {
setType(VALUE_IS_FLOAT);
_content.asFloat = value;
}
void setLinkedRaw(SerializedValue<const char *> value) {
if (value.data()) {
setType(VALUE_IS_LINKED_RAW);
_content.asRaw.data = value.data();
_content.asRaw.size = value.size();
} else {
setType(VALUE_IS_NULL);
}
}
template <typename T>
bool setOwnedRaw(SerializedValue<T> value, MemoryPool *pool) {
const char *dup = pool->saveString(adaptString(value.data(), value.size()));
if (dup) {
setType(VALUE_IS_OWNED_RAW);
_content.asRaw.data = dup;
_content.asRaw.size = value.size();
return true;
} else {
setType(VALUE_IS_NULL);
return false;
}
}
template <typename T>
typename enable_if<is_unsigned<T>::value>::type setInteger(T value) {
setType(VALUE_IS_UNSIGNED_INTEGER);
_content.asUnsignedInteger = static_cast<UInt>(value);
}
template <typename T>
typename enable_if<is_signed<T>::value>::type setInteger(T value) {
setType(VALUE_IS_SIGNED_INTEGER);
_content.asSignedInteger = value;
}
void setNull() {
setType(VALUE_IS_NULL);
}
void setStringPointer(const char *s, storage_policies::store_by_copy) {
ARDUINOJSON_ASSERT(s != 0);
setType(VALUE_IS_OWNED_STRING);
_content.asString = s;
}
void setStringPointer(const char *s, storage_policies::store_by_address) {
ARDUINOJSON_ASSERT(s != 0);
setType(VALUE_IS_LINKED_STRING);
_content.asString = s;
}
template <typename TAdaptedString>
bool setString(TAdaptedString value, MemoryPool *pool) {
return storeString(value, pool, typename TAdaptedString::storage_policy());
}
CollectionData &toArray() {
setType(VALUE_IS_ARRAY);
_content.asCollection.clear();
return _content.asCollection;
}
CollectionData &toObject() {
setType(VALUE_IS_OBJECT);
_content.asCollection.clear();
return _content.asCollection;
}
size_t memoryUsage() const {
switch (type()) {
case VALUE_IS_OWNED_STRING:
return strlen(_content.asString) + 1;
case VALUE_IS_OWNED_RAW:
return _content.asRaw.size;
case VALUE_IS_OBJECT:
case VALUE_IS_ARRAY:
return _content.asCollection.memoryUsage();
default:
return 0;
}
}
size_t nesting() const {
return isCollection() ? _content.asCollection.nesting() : 0;
}
size_t size() const {
return isCollection() ? _content.asCollection.size() : 0;
}
VariantData *addElement(MemoryPool *pool) {
if (isNull())
toArray();
if (!isArray())
return 0;
return _content.asCollection.addElement(pool);
}
VariantData *getElement(size_t index) const {
return isArray() ? _content.asCollection.getElement(index) : 0;
}
VariantData *getOrAddElement(size_t index, MemoryPool *pool) {
if (isNull())
toArray();
if (!isArray())
return 0;
return _content.asCollection.getOrAddElement(index, pool);
}
template <typename TAdaptedString>
VariantData *getMember(TAdaptedString key) const {
return isObject() ? _content.asCollection.getMember(key) : 0;
}
template <typename TAdaptedString>
VariantData *getOrAddMember(TAdaptedString key, MemoryPool *pool) {
if (isNull())
toObject();
if (!isObject())
return 0;
return _content.asCollection.getOrAddMember(key, pool);
}
void movePointers(ptrdiff_t stringDistance, ptrdiff_t variantDistance) {
if (_flags & OWNED_VALUE_BIT)
_content.asString += stringDistance;
if (_flags & COLLECTION_MASK)
_content.asCollection.movePointers(stringDistance, variantDistance);
}
uint8_t type() const {
return _flags & VALUE_MASK;
}
private:
void setType(uint8_t t) {
_flags &= OWNED_KEY_BIT;
_flags |= t;
}
template <typename TAdaptedString>
inline bool storeString(TAdaptedString value, MemoryPool *pool,
storage_policies::decide_at_runtime) {
if (value.isStatic())
return storeString(value, pool, storage_policies::store_by_address());
else
return storeString(value, pool, storage_policies::store_by_copy());
}
template <typename TAdaptedString>
inline bool storeString(TAdaptedString value, MemoryPool *,
storage_policies::store_by_address) {
if (value.isNull())
setNull();
else
setStringPointer(value.data(), storage_policies::store_by_address());
return true;
}
template <typename TAdaptedString>
inline bool storeString(TAdaptedString value, MemoryPool *pool,
storage_policies::store_by_copy) {
if (value.isNull()) {
setNull();
return true;
}
const char *copy = pool->saveString(value);
if (!copy) {
setNull();
return false;
}
setStringPointer(copy, storage_policies::store_by_copy());
return true;
}
};
} // namespace ARDUINOJSON_NAMESPACE
#if defined(__GNUC__)
#if __GNUC__ >= 8
#pragma GCC diagnostic pop
#endif
#endif
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