mirror of
https://github.com/eledio-devices/thirdparty-ArduinoJson.git
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381 lines
9.3 KiB
C++
381 lines
9.3 KiB
C++
// ArduinoJson - arduinojson.org
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// Copyright Benoit Blanchon 2014-2020
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// MIT License
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#pragma once
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#include <ArduinoJson/Misc/SerializedValue.hpp>
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#include <ArduinoJson/Numbers/convertNumber.hpp>
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#include <ArduinoJson/Polyfills/gsl/not_null.hpp>
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#include <ArduinoJson/Strings/RamStringAdapter.hpp>
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#include <ArduinoJson/Variant/VariantContent.hpp>
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namespace ARDUINOJSON_NAMESPACE {
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class VariantData {
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VariantContent _content; // must be first to allow cast from array to variant
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uint8_t _flags;
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public:
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// Must be a POD!
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// - no constructor
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// - no destructor
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// - no virtual
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// - no inheritance
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template <typename Visitor>
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void accept(Visitor &visitor) const {
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switch (type()) {
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case VALUE_IS_FLOAT:
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return visitor.visitFloat(_content.asFloat);
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case VALUE_IS_ARRAY:
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return visitor.visitArray(_content.asCollection);
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case VALUE_IS_OBJECT:
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return visitor.visitObject(_content.asCollection);
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case VALUE_IS_LINKED_STRING:
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case VALUE_IS_OWNED_STRING:
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return visitor.visitString(_content.asString);
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case VALUE_IS_OWNED_RAW:
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case VALUE_IS_LINKED_RAW:
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return visitor.visitRawJson(_content.asRaw.data, _content.asRaw.size);
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case VALUE_IS_NEGATIVE_INTEGER:
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return visitor.visitNegativeInteger(_content.asInteger);
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case VALUE_IS_POSITIVE_INTEGER:
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return visitor.visitPositiveInteger(_content.asInteger);
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case VALUE_IS_BOOLEAN:
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return visitor.visitBoolean(_content.asInteger != 0);
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default:
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return visitor.visitNull();
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}
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}
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template <typename T>
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T asIntegral() const;
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template <typename T>
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T asFloat() const;
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const char *asString() const;
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bool asBoolean() const;
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CollectionData *asArray() {
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return isArray() ? &_content.asCollection : 0;
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}
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const CollectionData *asArray() const {
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return const_cast<VariantData *>(this)->asArray();
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}
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CollectionData *asObject() {
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return isObject() ? &_content.asCollection : 0;
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}
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const CollectionData *asObject() const {
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return const_cast<VariantData *>(this)->asObject();
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}
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bool copyFrom(const VariantData &src, MemoryPool *pool) {
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switch (src.type()) {
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case VALUE_IS_ARRAY:
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return toArray().copyFrom(src._content.asCollection, pool);
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case VALUE_IS_OBJECT:
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return toObject().copyFrom(src._content.asCollection, pool);
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case VALUE_IS_OWNED_STRING:
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return setOwnedString(RamStringAdapter(src._content.asString), pool);
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case VALUE_IS_OWNED_RAW:
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return setOwnedRaw(
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serialized(src._content.asRaw.data, src._content.asRaw.size), pool);
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default:
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setType(src.type());
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_content = src._content;
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return true;
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}
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}
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bool equals(const VariantData &other) const {
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// Check that variant have the same type, but ignore string ownership
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if ((type() | VALUE_IS_OWNED) != (other.type() | VALUE_IS_OWNED))
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return false;
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switch (type()) {
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case VALUE_IS_LINKED_STRING:
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case VALUE_IS_OWNED_STRING:
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return !strcmp(_content.asString, other._content.asString);
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case VALUE_IS_LINKED_RAW:
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case VALUE_IS_OWNED_RAW:
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return _content.asRaw.size == other._content.asRaw.size &&
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!memcmp(_content.asRaw.data, other._content.asRaw.data,
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_content.asRaw.size);
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case VALUE_IS_BOOLEAN:
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case VALUE_IS_POSITIVE_INTEGER:
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case VALUE_IS_NEGATIVE_INTEGER:
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return _content.asInteger == other._content.asInteger;
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case VALUE_IS_ARRAY:
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return _content.asCollection.equalsArray(other._content.asCollection);
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case VALUE_IS_OBJECT:
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return _content.asCollection.equalsObject(other._content.asCollection);
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case VALUE_IS_FLOAT:
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return _content.asFloat == other._content.asFloat;
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case VALUE_IS_NULL:
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default:
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return true;
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}
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}
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bool isArray() const {
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return (_flags & VALUE_IS_ARRAY) != 0;
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}
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bool isBoolean() const {
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return type() == VALUE_IS_BOOLEAN;
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}
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bool isCollection() const {
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return (_flags & COLLECTION_MASK) != 0;
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}
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template <typename T>
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bool isInteger() const {
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switch (type()) {
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case VALUE_IS_POSITIVE_INTEGER:
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return canStorePositiveInteger<T>(_content.asInteger);
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case VALUE_IS_NEGATIVE_INTEGER:
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return canStoreNegativeInteger<T>(_content.asInteger);
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default:
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return false;
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}
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}
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bool isFloat() const {
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return type() == VALUE_IS_FLOAT || type() == VALUE_IS_POSITIVE_INTEGER ||
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type() == VALUE_IS_NEGATIVE_INTEGER;
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}
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bool isString() const {
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return type() == VALUE_IS_LINKED_STRING || type() == VALUE_IS_OWNED_STRING;
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}
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bool isObject() const {
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return (_flags & VALUE_IS_OBJECT) != 0;
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}
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bool isNull() const {
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return type() == VALUE_IS_NULL;
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}
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bool isEnclosed() const {
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return !isFloat();
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}
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void remove(size_t index) {
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if (isArray())
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_content.asCollection.remove(index);
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}
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template <typename TAdaptedString>
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void remove(TAdaptedString key) {
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if (isObject())
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_content.asCollection.remove(key);
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}
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void setBoolean(bool value) {
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setType(VALUE_IS_BOOLEAN);
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_content.asInteger = static_cast<UInt>(value);
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}
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void setFloat(Float value) {
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setType(VALUE_IS_FLOAT);
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_content.asFloat = value;
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}
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void setLinkedRaw(SerializedValue<const char *> value) {
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if (value.data()) {
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setType(VALUE_IS_LINKED_RAW);
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_content.asRaw.data = value.data();
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_content.asRaw.size = value.size();
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} else {
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setType(VALUE_IS_NULL);
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}
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}
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template <typename T>
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bool setOwnedRaw(SerializedValue<T> value, MemoryPool *pool) {
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char *dup = adaptString(value.data(), value.size()).save(pool);
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if (dup) {
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setType(VALUE_IS_OWNED_RAW);
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_content.asRaw.data = dup;
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_content.asRaw.size = value.size();
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return true;
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} else {
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setType(VALUE_IS_NULL);
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return false;
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}
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}
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template <typename T>
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typename enable_if<is_unsigned<T>::value>::type setInteger(T value) {
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setUnsignedInteger(value);
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}
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template <typename T>
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typename enable_if<is_signed<T>::value>::type setInteger(T value) {
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setSignedInteger(value);
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}
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template <typename T>
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void setSignedInteger(T value) {
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if (value >= 0) {
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setPositiveInteger(static_cast<UInt>(value));
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} else {
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setNegativeInteger(~static_cast<UInt>(value) + 1);
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}
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}
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void setPositiveInteger(UInt value) {
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setType(VALUE_IS_POSITIVE_INTEGER);
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_content.asInteger = value;
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}
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void setNegativeInteger(UInt value) {
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setType(VALUE_IS_NEGATIVE_INTEGER);
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_content.asInteger = value;
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}
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void setLinkedString(const char *value) {
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if (value) {
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setType(VALUE_IS_LINKED_STRING);
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_content.asString = value;
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} else {
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setType(VALUE_IS_NULL);
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}
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}
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void setNull() {
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setType(VALUE_IS_NULL);
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}
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void setOwnedString(not_null<const char *> s) {
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setType(VALUE_IS_OWNED_STRING);
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_content.asString = s.get();
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}
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bool setOwnedString(const char *s) {
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if (s) {
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setOwnedString(make_not_null(s));
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return true;
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} else {
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setType(VALUE_IS_NULL);
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return false;
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}
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}
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template <typename T>
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bool setOwnedString(T value, MemoryPool *pool) {
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return setOwnedString(value.save(pool));
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}
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void setUnsignedInteger(UInt value) {
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setType(VALUE_IS_POSITIVE_INTEGER);
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_content.asInteger = static_cast<UInt>(value);
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}
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CollectionData &toArray() {
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setType(VALUE_IS_ARRAY);
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_content.asCollection.clear();
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return _content.asCollection;
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}
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CollectionData &toObject() {
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setType(VALUE_IS_OBJECT);
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_content.asCollection.clear();
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return _content.asCollection;
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}
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size_t memoryUsage() const {
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switch (type()) {
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case VALUE_IS_OWNED_STRING:
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return strlen(_content.asString) + 1;
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case VALUE_IS_OWNED_RAW:
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return _content.asRaw.size;
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case VALUE_IS_OBJECT:
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case VALUE_IS_ARRAY:
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return _content.asCollection.memoryUsage();
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default:
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return 0;
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}
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}
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size_t nesting() const {
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return isCollection() ? _content.asCollection.nesting() : 0;
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}
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size_t size() const {
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return isCollection() ? _content.asCollection.size() : 0;
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}
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VariantData *addElement(MemoryPool *pool) {
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if (isNull())
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toArray();
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if (!isArray())
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return 0;
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return _content.asCollection.add(pool);
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}
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VariantData *getElement(size_t index) const {
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return isArray() ? _content.asCollection.get(index) : 0;
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}
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template <typename TAdaptedString>
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VariantData *getMember(TAdaptedString key) const {
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return isObject() ? _content.asCollection.get(key) : 0;
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}
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template <typename TAdaptedString>
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VariantData *getOrAddMember(TAdaptedString key, MemoryPool *pool) {
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if (isNull())
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toObject();
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if (!isObject())
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return 0;
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VariantData *var = _content.asCollection.get(key);
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if (var)
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return var;
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return _content.asCollection.add(key, pool);
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}
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void movePointers(ptrdiff_t stringDistance, ptrdiff_t variantDistance) {
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if (_flags & VALUE_IS_OWNED)
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_content.asString += stringDistance;
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if (_flags & COLLECTION_MASK)
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_content.asCollection.movePointers(stringDistance, variantDistance);
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}
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private:
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uint8_t type() const {
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return _flags & VALUE_MASK;
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}
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void setType(uint8_t t) {
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_flags &= KEY_IS_OWNED;
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_flags |= t;
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}
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};
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} // namespace ARDUINOJSON_NAMESPACE
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