internal object Evaluate(GetVariableDelegate varDelegate)
{
switch (this.Type)
{
case NodeType.Literal:
return(this.Value);
case NodeType.Operator:
object left = null;
if (this.Left != null)
{
left = this.Left.Evaluate(varDelegate);
}
object right = this.Right.Evaluate(varDelegate);
return(this.Operator.ApplyOperator(left, right));
case NodeType.Symbol:
string key = this.Value.ToString().ToLower();
object value = varDelegate(key);
if (value != (object)key)
{
return(value);
}
throw new Exception("Symbol Undefined: \"" + this.Value + "\"");
}
throw new Exception("Invalid Node Type");
}
public object Evaluate(GetVariableDelegate varDelegate)
{
if (varDelegate == null)
{
throw new ArgumentNullException("varDelegate");
}
return(rootNode.Evaluate(varDelegate));
}
