Simplify `CollectionData` to work only with `VariantSlot*`

src/ArduinoJson/Array/JsonArrayConst.hpp

@@ -70,7 +70,7 @@ class JsonArrayConst : public detail::VariantOperators<JsonArrayConst> {
   // Returns the element at the specified index.
   // https://arduinojson.org/v6/api/jsonarrayconst/subscript/
   FORCE_INLINE JsonVariantConst operator[](size_t index) const {
-    return JsonVariantConst(_data ? _data->getElement(index) : 0);
+    return JsonVariantConst(_data ? slotData(_data->get(index)) : 0);
   }
 
   operator JsonVariantConst() const {

src/ArduinoJson/Collection/CollectionData.hpp

@@ -19,32 +19,12 @@ class CollectionData {
   VariantSlot* _tail;
 
  public:
-  // Must be a POD!
-  // - no constructor
-  // - no destructor
-  // - no virtual
-  // - no inheritance
-
-  // Array only
-
-  VariantData* getElement(size_t index) const;
-
-  // Object only
-
-  template <typename TAdaptedString>
-  VariantData* getMember(TAdaptedString key) const;
-
-  template <typename TAdaptedString>
-  bool containsKey(const TAdaptedString& key) const;
-
-  // Generic
-
   void clear();
   size_t memoryUsage() const;
   size_t size() const;
 
-  void addSlot(VariantSlot*);
-  void removeSlot(VariantSlot* slot);
+  void add(VariantSlot*);
+  void remove(VariantSlot* slot);
 
   VariantSlot* head() const {
     return _head;
@@ -52,13 +32,13 @@ class CollectionData {
 
   void movePointers(ptrdiff_t variantDistance);
 
-  VariantSlot* getSlot(size_t index) const;
+  VariantSlot* get(size_t index) const;
 
   template <typename TAdaptedString>
-  VariantSlot* getSlot(TAdaptedString key) const;
+  VariantSlot* get(TAdaptedString key) const;
 
  private:
-  VariantSlot* getPreviousSlot(VariantSlot*) const;
+  VariantSlot* getPrevious(VariantSlot*) const;
 };
 
 inline const VariantData* collectionToVariant(

src/ArduinoJson/Collection/CollectionFunctions.hpp

@@ -15,7 +15,7 @@ inline VariantData* collectionAddElement(CollectionData* array,
   auto slot = pool->allocVariant();
   if (!slot)
     return nullptr;
-  array->addSlot(slot);
+  array->add(slot);
   return slot->data();
 }
 
@@ -33,7 +33,7 @@ inline VariantData* collectionAddMember(CollectionData* obj, TAdaptedString key,
   if (!storedKey)
     return nullptr;
   slot->setKey(storedKey);
-  obj->addSlot(slot);
+  obj->add(slot);
   return slot->data();
 }
 
@@ -71,7 +71,7 @@ inline void collectionRemove(CollectionData* data, VariantSlot* slot,
                              MemoryPool* pool) {
   if (!data || !slot)
     return;
-  data->removeSlot(slot);
+  data->remove(slot);
   slotRelease(slot, pool);
 }
 
@@ -79,7 +79,7 @@ inline void collectionRemoveElement(CollectionData* array, size_t index,
                                     MemoryPool* pool) {
   if (!array)
     return;
-  collectionRemove(array, array->getSlot(index), pool);
+  collectionRemove(array, array->get(index), pool);
 }
 
 template <typename TAdaptedString>
@@ -87,7 +87,7 @@ inline void collectionRemoveMember(CollectionData* obj, TAdaptedString key,
                                    MemoryPool* pool) {
   if (!obj)
     return;
-  collectionRemove(obj, obj->getSlot(key), pool);
+  collectionRemove(obj, obj->get(key), pool);
 }
 
 ARDUINOJSON_END_PRIVATE_NAMESPACE

src/ArduinoJson/Collection/CollectionImpl.hpp

@@ -11,7 +11,7 @@
 
 ARDUINOJSON_BEGIN_PRIVATE_NAMESPACE
 
-inline void CollectionData::addSlot(VariantSlot* slot) {
+inline void CollectionData::add(VariantSlot* slot) {
   ARDUINOJSON_ASSERT(slot != nullptr);
 
   if (_tail) {
@@ -29,12 +29,7 @@ inline void CollectionData::clear() {
 }
 
 template <typename TAdaptedString>
-inline bool CollectionData::containsKey(const TAdaptedString& key) const {
-  return getSlot(key) != 0;
-}
-
-template <typename TAdaptedString>
-inline VariantSlot* CollectionData::getSlot(TAdaptedString key) const {
+inline VariantSlot* CollectionData::get(TAdaptedString key) const {
   if (key.isNull())
     return 0;
   VariantSlot* slot = _head;
@@ -46,13 +41,13 @@ inline VariantSlot* CollectionData::getSlot(TAdaptedString key) const {
   return slot;
 }
 
-inline VariantSlot* CollectionData::getSlot(size_t index) const {
+inline VariantSlot* CollectionData::get(size_t index) const {
   if (!_head)
     return 0;
   return _head->next(index);
 }
 
-inline VariantSlot* CollectionData::getPreviousSlot(VariantSlot* target) const {
+inline VariantSlot* CollectionData::getPrevious(VariantSlot* target) const {
   VariantSlot* current = _head;
   while (current) {
     VariantSlot* next = current->next();
@@ -63,21 +58,10 @@ inline VariantSlot* CollectionData::getPreviousSlot(VariantSlot* target) const {
   return 0;
 }
 
-template <typename TAdaptedString>
-inline VariantData* CollectionData::getMember(TAdaptedString key) const {
-  VariantSlot* slot = getSlot(key);
-  return slot ? slot->data() : 0;
-}
-
-inline VariantData* CollectionData::getElement(size_t index) const {
-  VariantSlot* slot = getSlot(index);
-  return slot ? slot->data() : 0;
-}
-
-inline void CollectionData::removeSlot(VariantSlot* slot) {
+inline void CollectionData::remove(VariantSlot* slot) {
   if (!slot)
     return;
-  VariantSlot* prev = getPreviousSlot(slot);
+  VariantSlot* prev = getPrevious(slot);
   VariantSlot* next = slot->next();
   if (prev)
     prev->setNext(next);

src/ArduinoJson/Json/JsonDeserializer.hpp

@@ -274,24 +274,23 @@ class JsonDeserializer {
       TFilter memberFilter = filter[key.c_str()];
 
       if (memberFilter.allow()) {
-        VariantData* variant = object.getMember(adaptString(key.c_str()));
-        if (!variant) {
+        VariantSlot* slot = object.get(adaptString(key.c_str()));
+        if (!slot) {
           // Save key in memory pool.
           key = _stringStorage.save();
 
           // Allocate slot in object
-          VariantSlot* slot = _pool->allocVariant();
+          slot = _pool->allocVariant();
           if (!slot)
             return DeserializationError::NoMemory;
 
           slot->setKey(key);
-          object.addSlot(slot);
-
-          variant = slot->data();
+          object.add(slot);
         }
 
         // Parse value
-        err = parseVariant(*variant, memberFilter, nestingLimit.decrement());
+        err =
+            parseVariant(*slot->data(), memberFilter, nestingLimit.decrement());
         if (err)
           return err;
       } else {

src/ArduinoJson/MsgPack/MsgPackDeserializer.hpp

@@ -501,7 +501,7 @@ class MsgPackDeserializer {
           return DeserializationError::NoMemory;
 
         slot->setKey(key);
-        object->addSlot(slot);
+        object->add(slot);
 
         member = slot->data();
       } else {

src/ArduinoJson/Object/JsonObject.hpp

@@ -203,12 +203,12 @@ class JsonObject : public detail::VariantOperators<JsonObject> {
   inline detail::VariantData* getMember(TAdaptedString key) const {
     if (!_data)
       return 0;
-    return _data->getMember(key);
+    return slotData(_data->get(key));
   }
 
   template <typename TAdaptedString>
   void removeMember(TAdaptedString key) const {
-    collectionRemove(_data, _data->getSlot(key), _pool);
+    collectionRemove(_data, _data->get(key), _pool);
   }
 
   detail::CollectionData* _data;

src/ArduinoJson/Object/JsonObjectConst.hpp

@@ -130,7 +130,7 @@ class JsonObjectConst : public detail::VariantOperators<JsonObjectConst> {
   const detail::VariantData* getMember(TAdaptedString key) const {
     if (!_data)
       return 0;
-    return _data->getMember(key);
+    return slotData(_data->get(key));
   }
 
   const detail::CollectionData* _data;

src/ArduinoJson/Variant/SlotFunctions.hpp

@@ -18,10 +18,6 @@ inline size_t slotSize(const VariantSlot* var) {
   return n;
 }
 
-inline VariantData* slotData(VariantSlot* slot) {
-  return reinterpret_cast<VariantData*>(slot);
-}
-
 inline void slotRelease(const VariantSlot* slot, MemoryPool* pool) {
   ARDUINOJSON_ASSERT(slot != nullptr);
   if (slot->ownsKey())

src/ArduinoJson/Variant/VariantData.hpp

@@ -226,14 +226,18 @@ class VariantData {
   }
 
   VariantData* getElement(size_t index) const {
-    const CollectionData* col = asArray();
-    return col ? col->getElement(index) : 0;
+    auto array = asArray();
+    if (!array)
+      return nullptr;
+    return slotData(array->get(index));
   }
 
   template <typename TAdaptedString>
   VariantData* getMember(TAdaptedString key) const {
-    const CollectionData* col = asObject();
-    return col ? col->getMember(key) : 0;
+    auto object = asObject();
+    if (!object)
+      return nullptr;
+    return slotData(object->get(key));
   }
 
   void movePointers(ptrdiff_t variantDistance) {

src/ArduinoJson/Variant/VariantFunctions.hpp

@@ -195,7 +195,7 @@ inline NO_INLINE VariantData* variantGetOrAddElement(VariantData* var,
     slot = pool->allocVariant();
     if (!slot)
       return nullptr;
-    array->addSlot(slot);
+    array->add(slot);
     index--;
   }
   return slot->data();
@@ -223,7 +223,7 @@ VariantData* variantGetOrAddMember(VariantData* var, TAdaptedString key,
   auto obj = var->isNull() ? &var->toObject() : var->asObject();
   if (!obj)
     return nullptr;
-  auto slot = obj->getSlot(key);
+  auto slot = obj->get(key);
   if (slot)
     return slot->data();
   return collectionAddMember(obj, key, pool);

src/ArduinoJson/Variant/VariantSlot.hpp

@@ -105,4 +105,8 @@ class VariantSlot {
   }
 };
 
+inline VariantData* slotData(VariantSlot* slot) {
+  return reinterpret_cast<VariantData*>(slot);
+}
+
 ARDUINOJSON_END_PRIVATE_NAMESPACE