private static Object IntenalEval(ExpressionNode node, IDataResolver dataResolver)
{
switch (node.ActionType)
{
case ActionTypes.Function:
return FunctionEvaluator.Eval(node, dataResolver);
case ActionTypes.Operator:
return OperatorEvaluator.Eval(node, dataResolver);
}
switch (node.ValueType)
{
case ValueTypes.Variable:
{
if (_ordinalComparer.Equals(node.Action, "e"))
return Math.E;
if (_ordinalComparer.Equals(node.Action, "pi"))
return Math.PI;
if (_ordinalComparer.Equals(node.Action, "true"))
return true;
if (_ordinalComparer.Equals(node.Action, "false"))
return false;
if (_ordinalComparer.Equals(node.Action, "null"))
return null;
return dataResolver.GetValue(node.Action);
}
}
return node.Value;
}
public Object Eval(ExpressionNode node)
{
if (node == null)
{
return(null);
}
switch (node.ActionType)
{
case ActionTypes.Function:
return(FunctionEvaluator.Eval(node, this));
case ActionTypes.Operator:
return(OperatorEvaluator.Eval(node, this));
}
switch (node.ValueType)
{
case ValueTypes.Variable:
{
if (String.Equals(node.Action, "e", StringComparison.OrdinalIgnoreCase))
{
return(Math.E);
}
if (String.Equals(node.Action, "pi", StringComparison.OrdinalIgnoreCase))
{
return(Math.PI);
}
if (String.Equals(node.Action, "true", StringComparison.OrdinalIgnoreCase))
{
return(true);
}
if (String.Equals(node.Action, "false", StringComparison.OrdinalIgnoreCase))
{
return(false);
}
return(variableResolver(node.Action));
}
}
return(node.Value);
}