private void CalculateHPFunc()
{
char[] cArray = _formula.ToCharArray();
List <int> ilist = new List <int>();
foreach (var item in hpFuncNames)
{
ilist.Add(_formula.IndexOf(item));
}
ilist.RemoveAll(i => i == -1);
int idx = MinPredicate(ilist.ToArray());
var fnBuilder = new StringBuilder();
var valBuilder = new StringBuilder();
for (int j = idx; j < cArray.Length; j++)
{
if (char.IsLetter(cArray[j]))
{
fnBuilder.Append(cArray[j]);
continue;
}
else if (cArray[j].Equals('('))
{
for (int k = j + 1; k < cArray.Length; k++)
{
if (char.IsNumber(cArray[k]) || cArray[k].Equals(decimalSeparator))
{
valBuilder.Append(cArray[k]);
continue;
}
if (cArray[k].Equals(')'))
{
break;
}
}
continue;
}
else if (cArray[j].Equals(')'))
{
break;
}
}
double value;
if (!double.TryParse(valBuilder.ToString(), out value))
{
return;
}
var token = new FXExpression()
{
LeftValue = value,
Operator = FXExpression.GetOperatorFromString(fnBuilder.ToString()),
Priority = FXExpression.FXOperationPriority.High
};
accumulator = token.Calculate();
_formula = _formula.Remove(idx, token.FullStrCount).Insert(idx, accumulator.ToString()); //See that String.Remove do not remove first needed character
}
private void Calculate(bool isHigh)
{
char[] cArray = _formula.ToCharArray();
int idx1, idx2;
if (isHigh)
{
idx1 = cArray.ToList().IndexOf('*');
idx2 = cArray.ToList().IndexOf('/');
}
else
{
idx1 = cArray.ToList().IndexOf('+');
idx2 = cArray.ToList().IndexOf('-');
}
int item;
if (idx1 < 0)
{
item = idx2;
}
else if (idx2 < 0)
{
item = idx1;
}
else
{
item = idx1 < idx2 ? idx1 : idx2; // Analog for Math.Min(idx1, idx2)
}
idx1 = 0;
var tk = new FXExpression();
var builder1 = new StringBuilder();
for (int j = item + 1; j < cArray.Length; j++)
{
if (char.IsNumber(cArray[j]) || cArray[j].Equals(decimalSeparator))
{
builder1.Append(cArray[j]);
}
else
{
break;
}
}
double d;
if (!double.TryParse(builder1.ToString(), out d))
{
return;
}
tk.RightValue = d;
builder1.Clear();
for (int k = item - 1; k >= 0; k--)
{
if (char.IsNumber(cArray[k]) || cArray[k].Equals(decimalSeparator))
{
builder1.Insert(0, cArray[k]);
}
else
{
idx1 = item;
break;
}
}
if (!double.TryParse(builder1.ToString(), out d))
{
return;
}
tk.LeftValue = d;
builder1.Clear();
switch (cArray[item])
{
case '*':
tk.Operator = FXExpression.FXEOperation.Multiply;
tk.Priority = FXExpression.FXOperationPriority.Medium;
break;
case '/':
tk.Operator = FXExpression.FXEOperation.Divide;
tk.Priority = FXExpression.FXOperationPriority.Medium;
break;
case '-':
tk.Operator = FXExpression.FXEOperation.Minus;
tk.Priority = FXExpression.FXOperationPriority.Low;
break;
default:
tk.Operator = FXExpression.FXEOperation.Plus;
tk.Priority = FXExpression.FXOperationPriority.Low;
break;
}
if (isHigh)
{
_formula = _formula.Remove(idx1 - tk.LeftStrCount, tk.FullStrCount);
accumulator = tk.Calculate();
_formula = _formula.Insert(idx1 - tk.LeftStrCount, accumulator.ToString());
}
else
{
_formula = _formula.Remove(0, tk.FullStrCount);
accumulator = tk.Calculate();
_formula = _formula.Insert(0, accumulator.ToString());
}
}