public override object Visit(TernaryNode obj)
{
object condition = obj.Condition.Accept(this);
bool b = ScriptTypeUtil.EvalToBoolean(condition);
return(b ? obj.TrueValue.Accept(this) : obj.FalseValue.Accept(this));
}
private bool Logic(OperatorNode obj)
{
bool lhs = ScriptTypeUtil.EvalToBoolean(obj.Lhs.Accept(this));
//Note: Short cut Rhs
if (lhs && obj.Token.TokenValue == "||")
{
return(true);
}
if (!lhs && obj.Token.TokenValue == "&&")
{
return(false);
}
//Note: Eval Rhs
bool rhs = ScriptTypeUtil.EvalToBoolean(obj.Rhs.Accept(this));
if (obj.Token.TokenValue == "||")
{
return(lhs || rhs);
}
if (obj.Token.TokenValue == "&&")
{
return(lhs && rhs);
}
ExceptionHelper.ThrowBinaryOperatorInvalid(obj.Token.TokenValue, lhs, rhs);
return(false);
}
public override object Visit(UnaryNode obj)
{
object val = obj.OperandNode.Accept(this);
if (obj.Token.TokenValue == "!")
{
bool b = ScriptTypeUtil.EvalToBoolean(val);
return(!b);
}
if (val == null)
{
ExceptionHelper.ThrowEvalNull();
}
if (obj.Token.TokenValue == "+")
{
return(val);
}
if (obj.Token.TokenValue == "-")
{
if (ScriptTypeUtil.IsDecimal(val))
{
decimal result = ScriptTypeUtil.ConvertToDecimal(val);
return(-result);
}
if (ScriptTypeUtil.IsLong(val))
{
long result = ScriptTypeUtil.ConvertToLong(val);
return(-result);
}
}
ExceptionHelper.ThrowUnaryOperatorInvalid(obj.Token.TokenValue, val);
return(null);
}
public bool EvalToBool(object val)
{
return(ScriptTypeUtil.EvalToBoolean(val));
}