/// <summary>
/// Create a node when a rule is visited
/// </summary>
/// <param name="context"></param>
public override void EnterEveryRule([NotNull] ParserRuleContext context)
{
base.EnterEveryRule(context);
//create metadata to save some information of context
TreeViewerNodeMeta node = new TreeViewerNodeMeta();
node.StartIndex = context.Start.StartIndex;
node.StopIndex = context.Stop.StopIndex;
//current node is parent of context, add context to child list of current node
if (_currentNode.Text == context.Parent?.GetType().Name)
{
_currentNode.Nodes.Add(context.GetType().Name);
_currentNode = _currentNode.Nodes[_currentNode.Nodes.Count - 1];
_currentNode.Tag = node;
}
else
{
//current node is root node
if (_currentNode.Parent == null)
{
_currentNode.Nodes.Add(context.GetType().Name);
_currentNode = _currentNode.Nodes[_currentNode.Nodes.Count - 1];
_currentNode.Tag = node;
}
else
{
//current node and context node is same lever
_currentNode.Parent.Nodes.Add(context.GetType().Name);
_currentNode = _currentNode.Parent.Nodes[_currentNode.Parent.Nodes.Count - 1];
_currentNode.Tag = node;
}
}
//context is leaf node
if (context.ChildCount == 1 && context.GetChild(0).ChildCount <= 0)
{
node.Token = context.GetText();
_currentNode.Nodes.Add(context.GetText());
_currentNode.Nodes[0].Tag = node;
}
}
/// <summary>
/// Find a node in TreeNode that it's context match token
/// </summary>
/// <param name="tree"></param>
/// <param name="tokenStart"></param>
/// <returns></returns>
public static TreeNode FindNode(TreeNode tree, int tokenStart)
{
try
{
var current = tree;
TreeViewerNodeMeta meta = current.Tag as TreeViewerNodeMeta;
if ((current.Tag != null) && meta.StartIndex <= tokenStart && meta.StopIndex >= tokenStart && tree.Nodes.Count == 0)
{
if (current.PrevNode != null)
{
return(current.PrevNode);
}
else
{
return(current.Parent);
}
}
else
{
TreeNode result;
foreach (TreeNode node in current.Nodes)
{
result = FindNode(node, tokenStart);
if (result != null)
{
return(result);
}
}
return(null);
}
}
catch (Exception ex)
{
return(null);
}
}