Added support of String class (issue #55, #56, #70, #77)

src/CMakeLists.txt

@@ -1,5 +1,6 @@
-file(GLOB_RECURSE INC_FILES ../include/*.hpp)
-file(GLOB_RECURSE SRC_FILES *.cpp)
+file(GLOB_RECURSE HPP_FILES ../include/*.hpp)
+file(GLOB_RECURSE IPP_FILES ../include/*.ipp)
+file(GLOB_RECURSE CPP_FILES *.cpp)
 
 if(CMAKE_CXX_COMPILER_ID MATCHES "(GNU|Clang)")
 	add_definitions(
@@ -45,4 +46,4 @@ if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
 	)
 endif()
 
-add_library(ArduinoJson ${SRC_FILES} ${INC_FILES})
+add_library(ArduinoJson ${CPP_FILES} ${HPP_FILES} ${IPP_FILES})

src/Internals/List.cpp

@@ -19,6 +19,23 @@ size_t List<T>::size() const {
   return nodeCount;
 }
 
+template <typename T>
+typename List<T>::node_type *List<T>::addNewNode() {
+  if (!_buffer) return NULL;
+
+  node_type *newNode = new (_buffer) node_type();
+
+  if (_firstNode) {
+    node_type *lastNode = _firstNode;
+    while (lastNode->next) lastNode = lastNode->next;
+    lastNode->next = newNode;
+  } else {
+    _firstNode = newNode;
+  }
+
+  return newNode;
+}
+
 template <typename T>
 void List<T>::removeNode(node_type *nodeToRemove) {
   if (!nodeToRemove) return;

src/JsonObject.cpp

@@ -17,7 +17,7 @@ using namespace ArduinoJson::Internals;
 
 JsonObject JsonObject::_invalid(NULL);
 
-JsonObject::node_type *JsonObject::getOrCreateNodeAt(const char *key) {
+JsonObject::node_type *JsonObject::getOrCreateNodeAt(JsonObjectKey key) {
   node_type *existingNode = getNodeAt(key);
   if (existingNode) return existingNode;
 
@@ -25,21 +25,21 @@ JsonObject::node_type *JsonObject::getOrCreateNodeAt(const char *key) {
   return newNode;
 }
 
-JsonArray &JsonObject::createNestedArray(const char *key) {
+JsonArray &JsonObject::createNestedArray(JsonObjectKey key) {
   if (!_buffer) return JsonArray::invalid();
   JsonArray &array = _buffer->createArray();
   set(key, array);
   return array;
 }
 
-JsonObject &JsonObject::createNestedObject(const char *key) {
+JsonObject &JsonObject::createNestedObject(JsonObjectKey key) {
   if (!_buffer) return JsonObject::invalid();
   JsonObject &object = _buffer->createObject();
   set(key, object);
   return object;
 }
 
-JsonObject::node_type *JsonObject::getNodeAt(const char *key) const {
+JsonObject::node_type *JsonObject::getNodeAt(JsonObjectKey key) const {
   for (node_type *node = _firstNode; node; node = node->next) {
     if (!strcmp(node->content.key, key)) return node;
   }