public IState <IReadOnlySet <object> > Next(string param)
{
if (EndState.IsValidState(param))
{
return(new EndState(State));
}
if (OperatorState.IsValidState(param))
{
return(new ErrorState(State, new InvalidOperationException($"Unexpected operator: \"{param}\".")));
}
return(parser.TryParse(param, out var set, out var errors)
? new OperatorState(parser, set)
: new ErrorState(State, errors));
}
public IState <IReadOnlySet <object> > Next(string param)
{
if (EndState.IsValidState(param))
{
return(new EndState(State));
}
if (TryParse(param, out var op))
{
return(new RightArgumentState(argumentParser, State, op));
}
if (argumentParser.TryParse(param, out _, out _))
{
return(new ErrorState(State, new InvalidOperationException("Infix operator missing.")));
}
return(new ErrorState(State, new InvalidOperationException($"Unknown operator: \"{param}\".")));
}
public IState <IReadOnlySet <object> > Next(string param)
{
if (EndState.IsValidState(param))
{
return(new ErrorState(State, new InvalidOperationException("Unexpected EOF.")));
}
if (parser.TryParse(param, out var set, out var errors))
{
var next = Calculator.Apply(op, State, set);
return(new OperatorState(parser, next));
}
if (OperatorState.IsValidState(param))
{
return(new ErrorState(State, new InvalidOperationException($"Unexpected operator: \"{param}\".")));
}
return(new ErrorState(State, errors));
}
