internal static AST Convert(Node node) {
AST ast;
if (node is TryStatementHandler)
ast = new ExceptHandler((TryStatementHandler)node);
else
throw new ArgumentTypeException("Unexpected node type: " + node.GetType());
ast.GetSourceLocation(node);
return ast;
}
private void PushContext(Node n)
{
Debug.Assert(contextType != null && n.GetType() == contextType);
if (context == null)
{
context = new Stack<Node>();
}
context.Push(n);
}
private bool Process(Node node)
{
if (contextType != null && node.GetType() == contextType)
{
PushContext(node);
}
if (node.Start <= location && location < node.End)
{
SaveCandidate(node);
}
return true;
}
private void PostProcess(Node node)
{
if (contextType != null && node.GetType() == contextType)
{
PopContext(node);
}
}
private void PopContext(Node n)
{
Debug.Assert(contextType != null && n.GetType() == contextType);
Debug.Assert(context != null && context.Count > 0);
Node n2 = context.Pop();
Debug.Assert((object)n2 == (object)n);
}
private ISet<Namespace> EvaluateWorker(Node node)
{
EvalDelegate eval;
if (_evaluators.TryGetValue(node.GetType(), out eval)) {
return eval(this, node);
}
return EmptySet<Namespace>.Instance;
}