/// <summary>
/// Parses the specified string to a sequence of cells
/// that may contain a number or symbols or arithmetic operation.
/// </summary>
public InputCell[] Parse(string input)
{
var result = new LinkedList <InputCell>();
var numberBuffer = new NumberBuilder();
foreach (char ch in input)
{
if (ch.IsEmpty())
{
continue;
}
if (ch.IsDigit() || ch.IsDot())
{
numberBuffer.Append(ch);
continue;
}
result.AddIfNotNull(CreateCell(numberBuffer));
if (ch.IsMinus() && IsMinusForNumber(result))
{
numberBuffer.Append(ch);
continue;
}
result.AddLast(InputCell.Symbol(ch));
}
result.AddIfNotNull(CreateCell(numberBuffer));
return(result.ToArray());
}
public static InputCell CreateCell(NumberBuilder builder)
{
if (builder.IsEmpty())
{
return(null);
}
double number = builder.Build();
builder.Clear();
return(InputCell.Number(number));
}
