public static bool ApplyUrnaryOperator(IEnumerable <Operator> ops, UrnaryOperatorType opType, object first, out object success, out ParseException failure)
{
Validate.NonNull(ops, nameof(ops));
Validate.NonNull(opType, nameof(opType));
Validate.NonNull(first, nameof(first));
bool worked = ApplyUrnaryOperators(
FindUrnaryOperators(
ops,
opType,
first.GetType()
),
first,
out success
);
if (!worked)
{
failure = ParseException.UrnaryOperatorEvaluationFailed(opType.GetSymbolString(), first.ToString());
return(false);
}
else
{
failure = null;
return(true);
}
}
public static string GetSymbolString(this UrnaryOperatorType type)
{
switch (type)
{
case UrnaryOperatorType.Negation: return("-");
case UrnaryOperatorType.Positation: return("+");
default: return(string.Empty);
}
}
private static IEnumerable <UrnaryOperator> FindUrnaryOperators(IEnumerable <Operator> operators, UrnaryOperatorType type, Type t1)
{
Validate.NonNull(operators, nameof(operators));
Validate.NonNull(type, nameof(type));
Validate.NonNull(t1, nameof(t1));
var ops = operators
.Where(x => x is UrnaryOperator)
.Select(x => (UrnaryOperator)x)
.Where(x => x.Type == type && x.InputType == t1);
return(ops);
}
public UrnaryOperator(Type input, UrnaryOperatorType type, Func <object, object> eval)
{
this.Evaluate = eval;
this.Type = type;
this.InputType = input;
}
