private IEquationSet OperateSubString(string substring)
{
substring = substring.Trim(_thousandSeparator, ' ') + '\0';
var eqSubset = new List <IEqItem>();
int position = 0;
IEqItem processedItem = null;
var itemFactory = new EquationItemFactory();
do
{
var sign = substring[position];
if (itemFactory.CanOperate(processedItem, sign))
{
if (processedItem != null)
{
itemFactory.GetProcessedItemValue(processedItem,
substring.Substring(processedItem.Position, position - processedItem.Position));
eqSubset.Add(processedItem);
}
processedItem = itemFactory.GetOperation(sign, position);
}
position++;
} while (substring.Length > position);
return(new EquationSet(eqSubset.ToArray()));
}
public bool CanOperate(IEqItem processedItem, char sign)
{
if (char.IsDigit(sign) && !((processedItem is Variable) || (processedItem is Number)) ||
Operations.Contains(sign) || sign == '\0')
{
return(true);
}
return(false);
}
public void GetProcessedItemValue(IEqItem processedItem, string value)
{
switch (processedItem)
{
case var _ when processedItem is Number number:
if (double.TryParse(value, out var result))
{
number.SetValue(result);
}
break;
case var _ when processedItem is Variable variable:
variable.SetName(value);
break;
}
}
void Start()
{
RightHand = new NoItem();
LeftHand = new NoItem();
}