/// <summary>
/// Returns true if the suggested parameters match a configuration.
/// That configuration is returned.
/// </summary>
/// <param name="parameters"></param>
/// <param name="config"></param>
/// <returns></returns>
public virtual bool SuggestParameters(ExpressionItem[] parameters, out OperatorConfiguration config)
{
for (int i = 0; i < configs.Length; i++)
{
if (parameters.Length == configs[i].NrOfParameters)
{
config = configs[i];
return(true);
}
}
config = null;
return(false);
}
/// <summary>
/// The operator is supplied by a range of parameters.
/// The operator returns true if the parameters are accepted.
/// If the parameters are not accepted,
/// the suggested configuration is returned.
/// If the config is null, this means that the parameters are not accepted in any way.
/// </summary>
/// <param name="parameters">The parameters suggested.</param>
/// <param name="config">The alternative config suggested by the operator.</param>
/// <returns>True if the parameters are accepted as is.</returns>
public override bool SuggestParameters(ExpressionItem[] parameters, out OperatorConfiguration config)
{
bool result = base.SuggestParameters(parameters, out config);
if (result)
{
if (parameters[0] is VariableItem)
{
config = configs[0];
return(true);
}
}
return(result);
}
/// <summary>
/// The operator is supplied by a range of parameters.
/// The operator returns true if the parameters are accepted.
/// If the parameters are not accepted,
/// the suggested configuration is returned.
/// If the config is null, this means that the parameters are not accepted in any way.
/// </summary>
/// <param name="parameters">The parameters suggested.</param>
/// <param name="config">The alternative config suggested by the operator.</param>
/// <returns>True if the parameters are accepted as is.</returns>
public override bool SuggestParameters(ExpressionItem[] parameters, out OperatorConfiguration config)
{
bool result = base.SuggestParameters(parameters, out config);
if (result)
{
if (parameters.Length == 2 && parameters[0] is OperatorItem)
{
config = configs[1];
return(false);
}
else if (parameters.Length == 1 && parameters[0] is OperatorItem)
{
config = null;
return(false);
}
}
return(result);
}
/// <summary>
/// Creates a division operator.
/// Binary operator, left associative with precedence 3.
/// </summary>
internal DivideOperatorItem()
{
configs = new OperatorConfiguration[]
{ new OperatorConfiguration(Associativity.left, 2, 3) };
}
/// <summary>
/// Returns true if both configurations have the same number of parameters and associativity.
/// </summary>
/// <param name="config"></param>
/// <returns></returns>
public bool Equals(OperatorConfiguration config)
{
return(this.associativity == config.associativity && this.nrOfParameters == config.nrOfParameters);
}
internal AssignmentOperatorItem()
{
configs = new OperatorConfiguration[]
{ new OperatorConfiguration(Associativity.right, 2, 14) };
}
internal MinusOperatorItem()
{
configs = new OperatorConfiguration[]
{ new OperatorConfiguration(Associativity.left, 2, 4), new OperatorConfiguration(Associativity.left, 1, 2) };
}