public override object Exec(UnionType firstOperand, object arg)
{
// * If all the types in typeset generate a constraint, we simply generate one constraint using the whole union type
if (firstOperand.IsFreshVariable() && methodAnalyzed != null)
{
// * A constraint is added to the method analyzed
RelationalConstraint constraint = new RelationalConstraint(firstOperand, secondOperand, relationalOperator, location);
methodAnalyzed.AddConstraint(constraint);
return(constraint.ReturnType);
}
bool oneCorrectType = false;
foreach (TypeExpression type in firstOperand.TypeSet)
{
TypeExpression ret = (TypeExpression)type.AcceptOperation(new RelationalOperation(secondOperand, relationalOperator, methodAnalyzed, !firstOperand.IsDynamic && showErrorMessage, location), arg);
if (ret == null && !firstOperand.IsDynamic)
{
return(null);
}
if (ret != null)
{
oneCorrectType = true;
}
}
// * If there has been some errors, they have not been shown because the type is dynamic, we show it
if (showErrorMessage && firstOperand.IsDynamic && !oneCorrectType)
{
ErrorManager.Instance.NotifyError(new NoTypeAcceptsOperation(firstOperand.FullName, relationalOperator.ToString(), secondOperand.FullName, location));
}
return(BoolType.Instance);
}
public override object Exec(TypeVariable operand, object arg)
{
if (operand.Substitution != null)
{
DynVarOptions.Instance.AssignDynamism(operand.Substitution, operand.IsDynamic);
return(operand.Substitution.AcceptOperation(this, arg));
}
if (methodAnalyzed != null)
{
// * A constraint is added to the method analyzed
ArithmeticConstraint constraint = new ArithmeticConstraint(operand, unaryOperator, location);
methodAnalyzed.AddConstraint(constraint);
return(constraint.ReturnType);
}
return(ReportError(operand));
}
public override object Exec(TypeVariable d, object arg)
{
if (d.Substitution != null)
{
DynVarOptions.Instance.AssignDynamism(d.Substitution, d.IsDynamic);
return(d.Substitution.AcceptOperation(this, arg));
}
if (methodAnalyzed != null)
{
// * A attribute access constraint is added to the method analyzed
DotConstraint constraint = new DotConstraint(d, this.memberName, this.location);
methodAnalyzed.AddConstraint(constraint);
return(constraint.ReturnType);
}
ErrorManager.Instance.NotifyError(new OperationNotAllowedError(".", d.FullName, this.location));
return(null);
}
/// <summary>
/// If there are Substitution in the first operand, it return the result of aplying the operation using the substitution
/// as first operand. It is not the case, a constraint is added and if showErrorMessages is true an error is raise.
/// </summary>
/// <param name="firstOperand">A TypeVariable</param>
/// <sumary>The type expression resulting of applying the operand and second operator.
/// If somethis is worng and showMessages is true an error is raise.</sumary>
public override object Exec(TypeVariable firstOperand, object arg)
{
if (firstOperand.Substitution != null)
{
DynVarOptions.Instance.AssignDynamism(firstOperand.Substitution, firstOperand.IsDynamic);
return(firstOperand.Substitution.AcceptOperation(this, arg));
}
if (methodAnalyzed != null)
{
// * A constraint is added to the method analyzed
ArithmeticConstraint constraint = new ArithmeticConstraint(firstOperand, secondOperand, binaryOperator, location);
methodAnalyzed.AddConstraint(constraint);
return(constraint.ReturnType);
}
if (showErrorMessage)
{
ErrorManager.Instance.NotifyError(new OperationNotAllowedError(binaryOperator.ToString(), firstOperand.FullName, secondOperand.FullName, location));
}
return(null);
}
/// <summary>
/// The first Operand is a Double so the second must be promotable to a DoubleType so the whole operation must have sense.
/// Implements a double dispatch pattern.
/// </summary>
/// <param name="firstOperand">A double type to perform a binary arithmetica operation with. The second operate have to be promotable
/// to Double, cause is the grater integral value.</param>
/// <returns>A TypeExpression if the operation makes sense, otherwise if showMessages is true, an error is raised</returns>
public override object Exec(DoubleType firstOperand, object arg)
{
if ((int)this.secondOperand.AcceptOperation(new PromotionLevelOperation(firstOperand), arg) != -1)
{
if (secondOperand is TypeVariable)
{
if (methodAnalyzed != null && ((TypeVariable)secondOperand).Substitution == null)
{
// * A constraint is added to the method analyzed
ArithmeticConstraint constraint = new ArithmeticConstraint(firstOperand, secondOperand, binaryOperator, location);
methodAnalyzed.AddConstraint(constraint);
return(constraint.ReturnType);
}
}
return(DoubleType.Instance);
}
if (this.binaryOperator.Equals(ArithmeticOperator.Plus) && (bool)this.secondOperand.AcceptOperation(new EquivalentOperation(StringType.Instance), arg))
{
return(StringType.Instance);
}
// We rely in arithmetic conmutativiness to perform a cross recursion. Could it be dangerous?
return(secondOperand.AcceptOperation(ArithmeticalOperation.Create(firstOperand, this.binaryOperator, this.methodAnalyzed, this.showErrorMessage, this.location), arg));
}