/// <summary>
/// Retrieves the value of the expression
/// </summary>
/// <param name="evalContext">Evaluation context</param>
/// <returns>Evaluated expression value</returns>
public override ushort Evaluate(IEvaluationContext evalContext)
{
var cond = Condition.Evaluate(evalContext);
if (Condition.EvaluationError != null)
{
EvaluationError = Condition.EvaluationError;
return(0);
}
if (cond != 0)
{
var trueValue = TrueExpression.Evaluate(evalContext);
if (TrueExpression.EvaluationError == null)
{
return(trueValue);
}
EvaluationError = TrueExpression.EvaluationError;
return(0);
}
var falseValue = FalseExpression.Evaluate(evalContext);
if (FalseExpression.EvaluationError == null)
{
return(falseValue);
}
EvaluationError = FalseExpression.EvaluationError;
return(0);
}
/// <summary>
/// Retrieves the value of the expression
/// </summary>
/// <param name="evalContext">Evaluation context</param>
/// <returns>Evaluated expression value</returns>
public override ExpressionValue Evaluate(IEvaluationContext evalContext)
{
var cond = Condition.Evaluate(evalContext);
if (Condition.EvaluationError != null)
{
EvaluationError = Condition.EvaluationError;
return(ExpressionValue.Error);
}
if (cond.AsBool())
{
var trueValue = TrueExpression.Evaluate(evalContext);
if (TrueExpression.EvaluationError == null)
{
return(trueValue);
}
EvaluationError = TrueExpression.EvaluationError;
return(ExpressionValue.Error);
}
var falseValue = FalseExpression.Evaluate(evalContext);
if (FalseExpression.EvaluationError == null)
{
return(falseValue);
}
EvaluationError = FalseExpression.EvaluationError;
return(ExpressionValue.Error);
}
public override dynamic Evaluate(SymbolTable table)
{
if (EvaluationExpression.Evaluate(table))
{
return(TrueExpression.Evaluate(table));
}
else
{
return(FalseExpression.Evaluate(table));
}
}
public void CreateAndEvaluateTrueExpression()
{
TrueExpression expression = new TrueExpression();
Assert.IsNotNull(expression);
Assert.IsTrue((bool)expression.Value);
Machine machine = new Machine();
expression.Evaluate(machine);
Assert.AreEqual(1, machine.StackCount);
Assert.IsTrue((bool)machine.Pop());
}
/// <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)
{
// --- Check for condition expression errors
var cond = Condition.Evaluate(evalContext);
if (Condition.EvaluationError != null)
{
EvaluationError = Condition.EvaluationError;
return(ExpressionValue.Error);
}
if (cond.Type == ExpressionValueType.ByteArray)
{
EvaluationError = "A byte array cannot be used as a condition";
return(ExpressionValue.Error);
}
if (checkOnly)
{
return(ExpressionValue.NonEvaluated);
}
if (cond.AsBool())
{
// --- Condition is true
var trueValue = TrueExpression.Evaluate(evalContext);
if (TrueExpression.EvaluationError == null)
{
return(trueValue);
}
EvaluationError = TrueExpression.EvaluationError;
return(ExpressionValue.Error);
}
// --- Condition is false
var falseValue = FalseExpression.Evaluate(evalContext);
if (FalseExpression.EvaluationError == null)
{
return(falseValue);
}
EvaluationError = FalseExpression.EvaluationError;
return(ExpressionValue.Error);
}
public override ValueExpression Evaluate(IParserContext context)
{
bool result = context.ToBoolean(Condition.Evaluate(context).Value);
ValueExpression expression = null;
if (result)
{
expression = TrueExpression.Evaluate(context);
}
else if (FalseExpression != null)
{
expression = FalseExpression.Evaluate(context);
}
if (expression is ReturnValueExpression)
{
return(expression);
}
return(Exp.NullValue(TokenPosition));
}
/// <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 cond = Condition.Evaluate(evalContext);
if (!cond.IsValid)
{
return(ExpressionValue.Error);
}
if (cond.Value != 0)
{
var result = TrueExpression.Evaluate(evalContext);
SuggestTypeOf(TrueExpression);
return(result);
}
else
{
var result = FalseExpression.Evaluate(evalContext);
SuggestTypeOf(FalseExpression);
return(result);
}
}
