public static IEnumerable <Element> ParseNumberWithUnaryElements(string input)
{
string[] components = input.SeparateUnaryElements();
// the nice thing about all the unary operators is that they're one character
int currentComponentIndex = 0;
int currentCharacterIndex = 0;
if (currentComponentIndex == 1) // if we're in the number
{
currentComponentIndex = 2;
yield return(Element.Parse(components[1]));
}
else
{
if (currentCharacterIndex < components[currentComponentIndex].Length)
{
yield return(Element.ParseUnaryOperator(components[currentComponentIndex][currentCharacterIndex++].ToString(), currentComponentIndex == 0));
}
else if (currentCharacterIndex == components[currentComponentIndex].Length)
{
if (currentComponentIndex == 0)
{
currentComponentIndex = 1;
}
else
{
yield break;
}
}
}
}
private static List <Element> ParseElements(string input)
{
input = SpaceElements(input);
List <Element> result = new List <Element>();
foreach (string elementString in input.Split(' '))
{
if (elementString.Any(c => c == '+' || c == '-' || c == '~' || c == '!'))
{
var elementComponents = Element.ParseNumberWithUnaryElements(elementString);
result.AddRange(elementComponents); // so much for that yield, I guess
}
result.Add(Element.Parse(elementString));
}
return(result);
}