/// <summary>
/// Retrieves the value of the expression
/// </summary>
/// <param name="evalContext">Evaluation context</param>
/// <returns>Evaluated expression value</returns>
public override ExpressionValue Evaluate(IExpressionEvaluationContext evalContext)
{
var idExpr = evalContext.GetSymbolValue(SymbolName);
if (idExpr != ExpressionValue.Error)
{
SuggestType(ExpressionValueType.Word);
return(idExpr);
}
EvaluationError = $"Symbol '{SymbolName}' cannot be found";
return(ExpressionValue.Error);
}
/// <summary>
/// Retrieves the value of the expression
/// </summary>
/// <param name="evalContext">Evaluation context</param>
/// <param name="checkOnly"></param>
/// <returns>Evaluated expression value</returns>
public override ExpressionValue Evaluate(IExpressionEvaluationContext evalContext, bool checkOnly = false)
{
return(evalContext.GetSymbolValue(SymbolName) ?? ExpressionValue.Error);
}
/// <summary> /// This property signs if an expression is ready to be evaluated, /// namely, all subexpression values are known /// </summary> /// <param name="evalContext">Evaluation context</param> /// <returns>True, if the expression is ready; otherwise, false</returns> public override bool ReadyToEvaluate(IExpressionEvaluationContext evalContext) => evalContext.GetSymbolValue(SymbolName) != null;