Added nesting() to JsonArray, JsonDocument, JsonObject, and JsonVariant

src/ArduinoJson/Array/ArrayRef.hpp

@@ -38,6 +38,10 @@ class ArrayRefBase {
     return _data ? _data->memoryUsage() : 0;
   }
 
+  FORCE_INLINE size_t nesting() const {
+    return _data ? _data->nesting() : 0;
+  }
+
   FORCE_INLINE size_t size() const {
     return _data ? _data->size() : 0;
   }

src/ArduinoJson/Collection/CollectionData.hpp

@@ -56,6 +56,7 @@ class CollectionData {
   void remove(VariantSlot *slot);
 
   size_t memoryUsage() const;
+  size_t nesting() const;
   size_t size() const;
 
  private:

src/ArduinoJson/Collection/CollectionImpl.hpp

@@ -147,6 +147,15 @@ inline size_t CollectionData::memoryUsage() const {
   return total;
 }
 
+inline size_t CollectionData::nesting() const {
+  size_t maxChildNesting = 0;
+  for (VariantSlot* s = _head; s; s = s->next()) {
+    size_t childNesting = s->data()->nesting();
+    if (childNesting > maxChildNesting) maxChildNesting = childNesting;
+  }
+  return maxChildNesting + 1;
+}
+
 inline size_t CollectionData::size() const {
   return slotSize(_head);
 }

src/ArduinoJson/Document/JsonDocument.hpp

@@ -43,6 +43,10 @@ class JsonDocument : public Visitable {
     return _pool.size();
   }
 
+  size_t nesting() const {
+    return _data.nesting();
+  }
+
   size_t capacity() const {
     return _pool.capacity();
   }

src/ArduinoJson/Object/ObjectRef.hpp

@@ -46,6 +46,10 @@ class ObjectRefBase {
     return _data ? _data->memoryUsage() : 0;
   }
 
+  FORCE_INLINE size_t nesting() const {
+    return _data ? _data->nesting() : 0;
+  }
+
   FORCE_INLINE size_t size() const {
     return _data ? _data->size() : 0;
   }

src/ArduinoJson/Variant/VariantData.hpp

@@ -280,6 +280,16 @@ class VariantData {
     }
   }
 
+  size_t nesting() const {
+    switch (type()) {
+      case VALUE_IS_OBJECT:
+      case VALUE_IS_ARRAY:
+        return _content.asCollection.nesting();
+      default:
+        return 0;
+    }
+  }
+
   size_t size() const {
     if (type() == VALUE_IS_OBJECT || type() == VALUE_IS_ARRAY)
       return _content.asCollection.size();

src/ArduinoJson/Variant/VariantRef.hpp

@@ -99,6 +99,10 @@ class VariantRefBase {
     return _data ? _data->memoryUsage() : 0;
   }
 
+  FORCE_INLINE size_t nesting() const {
+    return _data ? _data->nesting() : 0;
+  }
+
   size_t size() const {
     return variantSize(_data);
   }