/// <summary>
/// Evaluate > >= != == less less than
/// </summary>
/// <returns></returns>
public object VisitCondition(ConditionExpr expr)
{
// Validate
var op = expr.Op;
if (op != Operator.And && op != Operator.Or)
throw new ArgumentException("Only && || supported");
var result = false;
var lhsVal = expr.Left.Evaluate(this);
var rhsVal = expr.Right.Evaluate(this);
var left = false;
var right = false;
if (lhsVal != null) left = ((LBool)lhsVal).Value;
if (rhsVal != null) right = ((LBool)rhsVal).Value;
if (op == Operator.Or)
{
result = left || right;
}
else if (op == Operator.And)
{
result = left && right;
}
return new LBool(result);
}
/// <summary>
/// Creates a unary expression with symbol scope, context, script refernce set.
/// </summary>
/// <param name="name"></param>
/// <param name="token"></param>
/// <returns></returns>
public static Expr Condition(Expr left, Operator op, Expr right, TokenData token)
{
var exp = new ConditionExpr();
exp.Left = left;
exp.Op = op;
exp.Right = right;
SetupContext(exp, token);
return exp;
}
/// <summary>
/// Visits the condition expression tree
/// </summary>
/// <param name="exp"></param>
public object VisitCondition(ConditionExpr exp)
{
_callBackOnNodeStart(exp);
_callBackOnNodeStart(exp.Left);
_callBackOnNodeStart(exp.Right);
return null;
}