/// <summary>
/// Execute the callstack this frame.
/// </summary>
/// <param name="status"></param>
private void Call(AINode.BehaviourStatus status = AINode.BehaviourStatus.Call)
{
//Check for callstack error.
if (callstack.Count == 0)
{
throw new InvalidOperationException("Callstack is empty. Check tree logic.");
}
//Get the current node on the callstack, and execute it, fetching it's status.
AINode current = callstack.Peek();
status = current.Run(this, dataContext, status);
switch (status)
{
//For success and failure, pop the callstack, and execute the next node.
case AINode.BehaviourStatus.Success:
case AINode.BehaviourStatus.Failure:
Pop();
Call(status);
break;
//This status should be impossible.
case AINode.BehaviourStatus.Call:
throw new InvalidOperationException(callstack.Peek().GetType().ToString() + ": Node cannot return the call status");
case AINode.BehaviourStatus.Running:
default:
//Do nothing.
break;
}
}
/// <summary>
/// Push a new node on the call stack, and execute the callstack.
/// </summary>
/// <param name="node"></param>
public void Call(AINode node)
{
//Push the new node on the callstack, and fetch the top of the callstack.
Push(node);
node = callstack.Peek();
//Initalize this node, and follow through depending on status.
var status = node.Init(this, dataContext);
switch (status)
{
case AINode.BehaviourStatus.Success: //Call the node.
Call(AINode.BehaviourStatus.Call);
break;
case AINode.BehaviourStatus.Failure: //Pop the node off the callstack, and return execution to it's parent.
Pop();
Call(AINode.BehaviourStatus.Failure);
break;
case AINode.BehaviourStatus.Running: //These status should be impossible durring Initialization.
case AINode.BehaviourStatus.Call:
throw new InvalidOperationException(callstack.Peek().GetType().ToString() + ": Node cannot reutrn Call or Running from Init");
}
}
/// <summary>
/// Set a new root for the tree, and clear the callstack.
/// </summary>
/// <param name="node"></param>
public void SetRoot(AINode node)
{
callstack = new Stack <AINode>();
Push(node);
node = callstack.Peek();
node.Init(this, dataContext);
}
/// <summary>
/// Construct a new AI Tree with the specified root.
/// </summary>
/// <param name="root"></param>
public AITree(AINode root, bool debugMode = false)
{
SetRoot(root);
if (debugMode)
{
log = new DebugLogger();
}
else
{
log = new AILogger();
}
}
public void PopUntil(AINode node)
{
try
{
while (callstack.Peek() != node)
{
Pop();
}
Pop();
}
catch
{
}
}
public override BehaviourStatus Init(AITree tree, DataContext dataContext)
{
try
{
subNode = AIResourceManager.GetTree(subTree);
if (subNode == null)
{
return(BehaviourStatus.Failure);
}
else
{
return(BehaviourStatus.Success);
}
}
catch
{
return(BehaviourStatus.Failure);
}
}
public static AINode GetTree(string name)
{
if (loadedTrees.ContainsKey(name))
{
return(loadedTrees[name]);
}
else
{
string path = "AITree/" + name;
string xml = Resources.Load <TextAsset>(path).text;
XmlSerializer ser = new XmlSerializer(typeof(AINode), Types);
StringReader sr = new StringReader(xml);
AINode node = ser.Deserialize(sr) as AINode;
if (node == null)
{
throw new NullReferenceException();
}
sr.Close();
loadedTrees.Add(name, node);
return(loadedTrees[name]);
}
}
/// <summary>
/// Push a new node on the callstack.
/// </summary>
/// <param name="node"></param>
void Push(AINode node)
{
callstack.Push(node.Clone());
}