/// <summary>
/// 要素登録
/// </summary>
/// <param name="pItem">要素</param>
/// <remarks>
/// CalculatorItemBaseクラスおよび派生クラスを登録します。
/// 登録する順番は数式に準じます。
/// </remarks>
public void Entry(CalculatorItemBase pItem)
{
if (pItem is CalculatorValueBase)
{
this.mStackValue.Push((CalculatorValue)pItem);
return;
}
CalculatorOperatorBase opeThis = (CalculatorOperatorBase)pItem;
// (
if (opeThis.OperatorType == CalculatorOperatorBase.EnumOperatorType.Open)
{
this.mStackOperator.Push(opeThis);
return;
}
// )
if (opeThis.OperatorType == CalculatorOperatorBase.EnumOperatorType.Close)
{
while (true)
{
CalculatorOperatorBase ope = this.mStackOperator.Pop();
ope.Calculation(this.mStackValue);
if (ope.OperatorType == CalculatorOperatorBase.EnumOperatorType.Open)
{
break;
}
}
return;
}
if (mStackOperator.Count == 0)
{
this.mStackOperator.Push(opeThis);
return;
}
CalculatorOperatorBase opeBefore = mStackOperator.Peek();
int priority = opeBefore.ComparePriority(opeThis);
if (priority < 0)
{
this.mStackOperator.Push(opeThis);
return;
}
opeBefore.Calculation(this.mStackValue);
mStackOperator.Pop();
this.mStackOperator.Push(opeThis);
}
/// <summary>
/// 計算結果取得
/// </summary>
/// <returns>CalculatorValue</returns>
/// <remarks>
/// 計算結果を返します。
/// </remarks>
public CalculatorValue GetAnswer()
{
while (this.mStackOperator.Count > 0)
{
CalculatorOperatorBase ope = this.mStackOperator.Pop();
ope.Calculation(this.mStackValue);
}
if (this.mStackValue.Count != 1)
{
throw new InvalidArithmeticExpressionException("値がスタックに残っています");
}
return(this.mStackValue.Pop());
}