public override void Eval(EvaluatorState ev)
{
//Console.WriteLine(this.ToString());
// returnning from a function = going one run level up
ev.DecreaseRunLevel();
// free all localy created data (==GBC==)
// -- not needed --
// restore stack pointer
ev.Stack.StackTop = ev.RegFP;
// get old FP value
IValue oldFPValue = ev.Stack.ReadTop();
ev.Stack.Pop();
if (oldFPValue.TypeOf() == ValueTypeID.TYPE_STFP)
{
ev.RegFP = oldFPValue.GetIntValue();
}
else
{
throw new SharpNektonException(new SharpNektonError(SharpNektonErrorID.E_EXPTYPESTFP));
}
}
/// <summary>
/// <see cref="ICondition.Evaluate" />
/// </summary>
public bool Evaluate()
{
try{
switch (_equationtype)
{
case EquationType.EQ:
return(_leftValue.GetIntValue() == _rightValue.GetIntValue());
case EquationType.GR:
return(_leftValue.GetIntValue() > _rightValue.GetIntValue());
case EquationType.LT:
return(_leftValue.GetIntValue() < _rightValue.GetIntValue());
case EquationType.GREQ:
return(_leftValue.GetIntValue() >= _rightValue.GetIntValue());
case EquationType.LTEQ:
return(_leftValue.GetIntValue() <= _rightValue.GetIntValue());
case EquationType.STREQ:
return(_leftValue.GetStringValue().Equals(_rightValue.GetStringValue()));
case EquationType.CONT:
return((_leftValue.GetStringValue().Contains(_rightValue.GetStringValue()) &&
!_rightValue.GetStringValue().Equals(string.Empty)) ||
(_rightValue.GetStringValue().Contains(_leftValue.GetStringValue()) &&
!_leftValue.GetStringValue().Equals(string.Empty)));
case EquationType.STRCONT:
return((_leftValue.GetStringValue().Contains(_rightValue.GetStringValue()) &&
!_rightValue.GetStringValue().Equals(string.Empty)));
default:
return(false);
}
}
catch (Exception)
{
return(false);
}
}
private IValue DoOperation(IValue a, IValue b, TokenID variation)
{
switch (variation)
{
case TokenID.T_ASSIGN_OP: // a = b
return(b);
case TokenID.T_ADD_ASSIGN_OP: // a += b
// is it a numeric operation or a string concatenation?
if (a.TypeOf() != ValueTypeID.TYPE_STRING && b.TypeOf() != ValueTypeID.TYPE_STRING)
{
return(new NumericValue(a.GetNumericValue() + b.GetNumericValue()));
}
else
{
return(new StringValue(a.GetStringValue() + b.GetStringValue()));
}
case TokenID.T_SUB_ASSIGN_OP: // a -= b
return(new NumericValue(a.GetNumericValue() - b.GetNumericValue()));
case TokenID.T_MUL_ASSIGN_OP: // a *= b
return(new NumericValue(a.GetNumericValue() * b.GetNumericValue()));
case TokenID.T_DIV_ASSIGN_OP: // a /= b (allways real-number op.)
double bn = b.GetNumericValue();
// do not divide by zero!
if (bn == 0.0)
{
throw new SharpNektonException(new SharpNektonError(SharpNektonErrorID.E_DIVZERO));
}
return(new NumericValue(a.GetNumericValue() / bn));
case TokenID.T_MOD_ASSIGN_OP: // a %= b
int bi = b.GetIntValue();
// do not divide by zero!
if (bi == 0)
{
throw new SharpNektonException(new SharpNektonError(SharpNektonErrorID.E_DIVZERO));
}
int ai = a.GetIntValue();
return(new NumericValue((double)(ai % bi)));
case TokenID.T_POW_ASSIGN_OP: // a **= b
return(new NumericValue(Math.Pow(a.GetNumericValue(), b.GetNumericValue())));
case TokenID.T_STRCAT_ASSIGN_OP: // a ..= b
return(new StringValue(a.GetStringValue() + b.GetStringValue()));
default:
throw new SharpNektonException(new SharpNektonError(SharpNektonErrorID.E_BADSTOREOPERATIONOP));
}
}
public override void Eval(EvaluatorState ev)
{
// Console.WriteLine(this.ToString());
// second operand is in R
IValue b = ev.GetVal();
int bi = b.GetIntValue();
// do not divide by zero!
if (bi == 0)
{
throw new SharpNektonException(new SharpNektonError(SharpNektonErrorID.E_DIVZERO));
}
// first operand
IValue a = ev.GetStackTopVal();
ev.Stack.Pop(); // pop a
int ai = a.GetIntValue();
ev.RegR = new NumericValue((double)(ai / bi));
}