/// <summary>
/// Evaluate a constant.
/// </summary>
/// <param name="val"></param>
/// <returns></returns>
public object VisitConstant(ConstantExpr expr)
{
var val = expr.Value;
// 1. Null
if (val == LObjects.Null)
return val;
if (val is LObject)
return val;
// 2. Actual value.
var ltype = LangTypeHelper.ConvertToLangValue(val);
return ltype;
}
/// <summary>
/// Creates a variable expression with symbol scope, context, script refernce set.
/// </summary>
/// <param name="name"></param>
/// <returns></returns>
public static Expr Const(LObject obj, TokenData token)
{
var exp = new ConstantExpr();
exp.Value = obj;
SetupContext(exp, token);
return exp;
}
/// <summary>
/// Visits the condition expression tree
/// </summary>
/// <param name="exp"></param>
public object VisitConstant(ConstantExpr exp)
{
return null;
}