/// <summary>
/// Check stringBuilder
/// </summary>
/// <param name="str">Current string</param>
/// <param name="func">Current delegate</param>
/// <returns>is it a positive integer number</returns>
public static bool UintParse(this StringBuilder str, Func <string, Automate, bool> func)
{
Automate automate = new Automate();
return(func(str.ToString(), automate));
}
/// <summary>
/// Parse to a positive integer
/// </summary>
/// <param name="str">Current string</param>
/// <param name="automate">Current automate</param>
/// <returns>is it a positive integer number</returns>
public static bool ParseToUint(string str, Automate automate)
{
HashSet <int> currentSet = new HashSet <int>(automate.StartStates);
HashSet <int> temp = currentSet;
int countDigitAfterCommas = 0;
int numberAfterEps = 0;
for (int i = 0; i < str.Length; i++)
{
temp = new HashSet <int>();
if (automate.Alphabet.Contains(str[i]))
{
int j = Array.IndexOf(automate.Alphabet, str[i]);
foreach (var currentState in currentSet)
{
if (automate.Table[currentState][j] == -1)
{
return(false);
}
temp.Add(automate.Table[currentState][j]);
if (str[i] == '.' || str[i] == ',')
{
countDigitAfterCommas = i;
}
if (str[i] == 'E' || str[i] == 'e')
{
countDigitAfterCommas = i - countDigitAfterCommas - 1;
}
if (str[i] != '+' && str[i] != '-' && (currentState == 6 || currentState == 7 || currentState == 8 || currentState == 9))
{
numberAfterEps += str[i] & 0x0f;
}
}
currentSet = temp;
}
else
{
return(false);
}
}
if (automate.FinishStates.Contains(temp.ElementAt(0)))
{
if (numberAfterEps == 0 && countDigitAfterCommas == 0)
{
return(true);
}
else if (numberAfterEps > countDigitAfterCommas && str.Contains('+'))
{
return(true);
}
else if (numberAfterEps <= countDigitAfterCommas)
{
int item = str.IndexOf('E') == -1 ? str.IndexOf('e') : str.IndexOf('E');
while (str[--item].CompareTo('0') == 0)
{
countDigitAfterCommas--;
}
if (numberAfterEps > countDigitAfterCommas)
{
return(true);
}
}
}
return(false);
}
/// <summary>
/// Check string
/// </summary>
/// <param name="str">Current string</param>
/// <param name="func">Current delegate</param>
/// <returns>is it a positive integer number</returns>
public static bool UintParse(this string str, Func <string, Automate, bool> func)
{
Automate automate = new Automate();
return(func(str, automate));
}
