public TreeNode Evaluate()
{
exceptions.Clear();
try {
if (ExpressionTree == null)
{
var parser = new Parser();
ExpressionTree = parser.Parse(input);
ExpressionTree.CopyFunctionsFrom(function_table_expression);
}
return(Evaluate(ExpressionTree));
} catch (Exception e) {
var next = e;
do
{
if (next != null)
{
exceptions.Add(next);
next = next.InnerException;
}
} while(next != null && next.InnerException != null);
if (next != null)
{
exceptions.Add(next);
}
}
return(null);
}