/// <summary>
/// A method adds inputted element to exists expression and validate the expression with adding a inputted element. </summary>
/// <param name="input"> A inputted element </param>
/// <param name="separated"> A infix notation expression InputElement list </param>
/// <returns> A element adding result status </returns>
public AddingElementResult GetseparatedPlainText(string input, out IEnumerable <InputElement> separated)
{
double inputNumber;
separated = expressionElements;
if (input.Length < 1)
{
IsLastValidationSucceed = false;
return(new InvalidFormatUsed());
}
if (Double.TryParse(input, out inputNumber))
{
Literal InputLiteral = new Literal(input);
if (IsEmptyInputElements)
{
expressionElements.Add(InputLiteral);
IsEqualUsed = false;
IsLastValidationSucceed = true;
return(new AddingPossible());
}
else
{
AddingElementResult res = expressionElements.Last().CheckPossibilityAddingElement(ref expressionElements,
ref IsEqualUsed, ref IsLastValidationSucceed, InputLiteral);
IsEqualUsed = false;
if (res is AddingPossible)
{
IsLastValidationSucceed = true;
}
else
{
IsLastValidationSucceed = false;
}
return(res);
}
}
InputElement inputElem = Operators.GetOperatorAsInputElement(input);
IOperator inputOper = inputElem as IOperator;
if (inputOper == null)
{
IsLastValidationSucceed = false;
return(new InvalidFormatUsed());
}
if (IsEmptyInputElements)
{
if (OperandType.LEFT == inputOper.OperandType ||
OperandType.BOTH == inputOper.OperandType)
{
// Exceptional Case : '.' => '0.'
if (inputOper is Point)
{
expressionElements.Add(new Literal("0"));
}
else
{
return(new InvalidFormatUsed());
}
}
expressionElements.Add(inputElem);
Operators.GetOperatorAsInputElement(input)?.PostAddingWork(ref expressionElements);
IsEqualUsed = false;
IsLastValidationSucceed = true;
return(new AddingPossible());
}
if (inputElem.AlternativeWork(ref expressionElements, ref IsEqualUsed, ref IsLastValidationSucceed))
{
IsEqualUsed = false;
IsLastValidationSucceed = true;
return(new AddingPossible());
}
// Exceptional case : Only one '.'
if (input.CompareTo(".") == 0)
{
if (CheckDotExist())
{
separated = expressionElements;
IsLastValidationSucceed = true;
return(new AddingImpossible());
}
}
else if (input.CompareTo("R") == 0)
{
if (ReverseSign(out separated))
{
return(new AddingPossible());
}
return(new InvalidFormatUsed());
}
expressionElements.Last().CheckPossibilityAddingElement(ref expressionElements, ref IsEqualUsed, ref IsLastValidationSucceed, inputOper as InputElement);
IsEqualUsed = false;
IsLastValidationSucceed = true;
return(new AddingPossible());
}