improve error messages and checking

src/state_machine/State.cpp

@@ -25,12 +25,12 @@ void State::_init()
 
 void State::_state_enter(const String state, const Array args)
 {
-    WARN_PRINT("State " + state + " is missing its _state_enter method!");
+    WARN_PRINT("State " + get_state_machine()->get_current_state() + " is missing its _state_enter method!");
 }
 
 void State::_state_exit(const String state, const Array args)
 {
-    WARN_PRINT("State " + state + " is missing its _state_exit method!");
+    WARN_PRINT("State " + get_state_machine()->get_current_state() + " is missing its _state_exit method!");
 }
 
 void State::set_parent(Node *parent)

src/state_machine/StateMachine.cpp

@@ -34,7 +34,15 @@ void StateMachine::_ready()
     connect("tree_entered", this, "_on_StateMachine_tree_entered");
     connect("tree_exiting", this, "_on_StateMachine_tree_exiting");
     parent = get_parent();
+    add_states();
+    if (has(get_default_state()))
+    {
         set_current_state(get_default_state());
+    }
+    else
+    {
+        WARN_PRINT("The selected default state " + get_default_state() + " doesn't exist!");
+    }
     setup();
 }
 
@@ -46,13 +54,13 @@ void StateMachine::setup()
     {
         if (children.size() > 0)
         {
-            WARN_PRINT("State machine doesn't have a default state set, using first child!");
+            WARN_PRINT("The state machine doesn't have a default state set, using first child!");
             auto child = Object::cast_to<Node>(children[0].operator Object*());
             set_current_state(child->get_name());
         }
         else
         {
-            ERR_PRINT("State machine doesn't have a default state set and has no child states!");
+            ERR_PRINT("The state machine doesn't have a default state set and has no child states!");
             return;
         }
     }
@@ -60,7 +68,6 @@ void StateMachine::setup()
     for (uint8_t i = 0; i < children.size(); i++)
     {
         auto child = Object::cast_to<Node>(children[i].operator Object*());
-        add_state(child->get_name(), child);
 
         child->call("set_state_machine", this);
 
@@ -72,7 +79,24 @@ void StateMachine::setup()
         }
     }
 
+    Node *state_node = Object::cast_to<Node>(this->states[get_current_state()]);
+    if (state_node->has_method("_state_enter"))
+    {
         this->call("_state_enter", get_current_state());
+    }
+    else {
+        WARN_PRINT("The state " + get_current_state() + " doesn't have a _state_enter method!");
+    }
+}
+
+void StateMachine::add_states()
+{
+    auto children = get_children();
+    for (uint8_t i = 0; i < children.size(); i++)
+    {
+        auto child = Object::cast_to<Node>(children[i].operator Object*());
+        add_state(child->get_name(), child);
+    }
 }
 
 void StateMachine::add_state(const String state, Node *child)
@@ -111,8 +135,31 @@ void StateMachine::change(const String state, const Array &args)
         return this->restart(state, args);
     }
 
+    if (!has(state))
+    {
+        WARN_PRINT("The state " + state + " does not exist, called from state " + get_current_state() + "!");
+        return;
+    }
+
     auto previous_state = get_current_state();
-    auto exiting = this->call("_state_exit", state, args);
+
+    Variant exiting;
+    Node *state_node = Object::cast_to<Node>(this->states[previous_state]);
+    if (state_node)
+    {
+        if (state_node->has_method("_state_exit"))
+        {
+            exiting = this->call("_state_exit", state, args);
+        }
+        else
+        {
+            WARN_PRINT("The state " + get_current_state() + " doesn't have a _state_exit method!");
+        }
+    }
+    else
+    {
+        ERR_PRINT("Could not get current state node for " + get_current_state() + "!");
+    }
 
     if (get_current_state() != "")
     {
@@ -132,7 +179,23 @@ void StateMachine::change(const String state, const Array &args)
     auto child = Object::cast_to<Node>(states[get_current_state()].operator Object*());
     this->add_child(child);
 
+    state_node = Object::cast_to<Node>(this->states[get_current_state()]);
+    if (state_node)
+    {
+        if (state_node->has_method("_state_enter"))
+        {
             this->call("_state_enter", previous_state, args);
+        }
+        else
+        {
+            WARN_PRINT("The state " + get_current_state() + " doesn't have a _state_enter method!");
+        }
+    }
+    else
+    {
+        ERR_PRINT("Could not get current state node for " + get_current_state() + "!");
+    }
+
     this->emit_signal("state_entered", get_current_state());
     if (debug)
     {
@@ -143,11 +206,23 @@ void StateMachine::change(const String state, const Array &args)
 Variant StateMachine::call(const String method, const Array &args)
 {
     auto node = Object::cast_to<Node>(states[get_current_state()].operator Object*());
-    if (node != nullptr)
+    if (node)
+    {
+        if (node->has_method(method))
         {
             return node->call(method, args);
         }
+        else
+        {
+            WARN_PRINT("The state " + get_current_state() + " doesn't contain the method " + method + "!");
             return Variant();
+        }
+    }
+    else
+    {
+        ERR_PRINT("Could not get current state node for " + get_current_state() + "!");
+        return Variant();
+    }
 }
 
 Variant StateMachine::_call(const String method, const Array &args)
@@ -196,7 +271,7 @@ void StateMachine::_on_StateMachine_tree_exiting()
     for (uint8_t i = 0; i < keys.size(); i++)
     {
         auto child = Object::cast_to<Node>(states[keys[i]].operator Object*());
-        if (child != nullptr)
+        if (child)
         {
             auto children = get_children();
             if (!children.has(child))
@@ -204,5 +279,10 @@ void StateMachine::_on_StateMachine_tree_exiting()
                 this->add_child(child);
             }
         }
+        else
+        {
+            ERR_PRINT("Could not get child node!");
+            return;
+        }
     }
 }

src/state_machine/StateMachine.h

@@ -43,6 +43,12 @@ namespace godot
              */
             Dictionary states;
 
+            /**
+             * @brief This adds all nodes of the states machine as states in the machine.
+             * 
+             */
+            void add_states();
+
             /**
              * @brief This adds a state to the list of states in the state machine.
              * 
@@ -51,6 +57,13 @@ namespace godot
              */
             void add_state(const String state, Node *child);
 
+            /**
+             * @brief Set the current state object.
+             * 
+             * @param[in] current_state The current state that is running.
+             */
+            void set_current_state(const String current_state);
+
         public:
             /**
              * @brief This method registers classes with Godot.
@@ -157,6 +170,13 @@ namespace godot
              */
             String get_default_state();
 
+            /**
+             * @brief Get the current state object.
+             * 
+             * @return String The current running state.
+             */
+            String get_current_state();
+
             /**
              * @brief Set the debug object.
              * 
@@ -172,20 +192,6 @@ namespace godot
              */
             bool get_debug();
 
-            /**
-             * @brief Set the current state object.
-             * 
-             * @param[in] current_state The current state that is running.
-             */
-            void set_current_state(const String current_state);
-
-            /**
-             * @brief Get the current state object.
-             * 
-             * @return String The current running state.
-             */
-            String get_current_state();
-
             /**
              * @brief This method is called when the signal tree_entered is emitted.
              *